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I hope I can become better and better in myself and my everything. Some tasks for today.\n\n - Understand Optical power, average and peak power. And corresponding calculation.\n - Verify the code for RRU2217, check the code for set rx and set tx as well.\n - Meeting at 12:00 with Carl for DSX-5000.\n - Go to gym for training.\n\n <!-- more -->\n\n-----\n## **Optical Power**\nTotal power, average power, peak power, what is the meaning for them? How to calculate and the relationship between them\n> Question from ResearchGate [How to count total power from OSA](https://www.researchgate.net/post/How_can_I_count_the_total_power_of_the_light_from_the_power_spectrum_measured_by_the_OSA)\n\n### 1. Peak power and Average power\n[Tutorial](https://www.newport.com/medias/sys_master/images/images/h8f/h7a/8797052108830/Average-and-Peak-Power-Calculation-Tech-Note-1.pdf)\n\nIn general speaking, Average power is the laser output power from the light souce. The value depend on the souce, e.x, LED souce or other different source. See [introduction](http://www.coherent.com/downloads/aboutmeasuringlaserpowerndenergyoutputfinal.pdf)\n\n### 2. Optical spectral power\nOptical spectrum analysis is the measurement of optical power as a function of wavelength. See description [here](http://cp.literature.agilent.com/litweb/pdf/5963-7145E.pdf)\n\n### 3. RJ45 Standards\n**ISO/IEC 11801:1995**\n![Channel and permanent link description](/images/channel1.jpg)\n- define the channel and permanent link\n- Channel excludes the connections at application-specific equipment\n- Permanent link is the transmission path includes connections at the ends of linstalled cabling.\n- No define for patch cord cable\n\n**ANSI/TIA/EIA-568:A**\n\n- clause 6.6, define cord cable, `IL`, `RL`\n- clause 6.8, define connectors, `IL`, `RL`, `NEXT`, `FEXT`\n- clause 6.9, define cable assembles (patch cord, work area cables), `RL`, `NEXT`\n\n-------\n","source":"_posts/20160816.md","raw":"layout: \ntitle: 20160816\ndate: 2016-08-16 08:59:03\ntags: \n- work \n- optical-power \n- rj45\ncategories:\n- Technology\n---\n\n# Task for today\n\nToday is the 5th year I came to Sweden, Stockholm. I hope I can become better and better in myself and my everything. Some tasks for today.\n\n - Understand Optical power, average and peak power. And corresponding calculation.\n - Verify the code for RRU2217, check the code for set rx and set tx as well.\n - Meeting at 12:00 with Carl for DSX-5000.\n - Go to gym for training.\n\n <!-- more -->\n\n-----\n## **Optical Power**\nTotal power, average power, peak power, what is the meaning for them? How to calculate and the relationship between them\n> Question from ResearchGate [How to count total power from OSA](https://www.researchgate.net/post/How_can_I_count_the_total_power_of_the_light_from_the_power_spectrum_measured_by_the_OSA)\n\n### 1. Peak power and Average power\n[Tutorial](https://www.newport.com/medias/sys_master/images/images/h8f/h7a/8797052108830/Average-and-Peak-Power-Calculation-Tech-Note-1.pdf)\n\nIn general speaking, Average power is the laser output power from the light souce. The value depend on the souce, e.x, LED souce or other different source. See [introduction](http://www.coherent.com/downloads/aboutmeasuringlaserpowerndenergyoutputfinal.pdf)\n\n### 2. Optical spectral power\nOptical spectrum analysis is the measurement of optical power as a function of wavelength. See description [here](http://cp.literature.agilent.com/litweb/pdf/5963-7145E.pdf)\n\n### 3. RJ45 Standards\n**ISO/IEC 11801:1995**\n![Channel and permanent link description](/images/channel1.jpg)\n- define the channel and permanent link\n- Channel excludes the connections at application-specific equipment\n- Permanent link is the transmission path includes connections at the ends of linstalled cabling.\n- No define for patch cord cable\n\n**ANSI/TIA/EIA-568:A**\n\n- clause 6.6, define cord cable, `IL`, `RL`\n- clause 6.8, define connectors, `IL`, `RL`, `NEXT`, `FEXT`\n- clause 6.9, define cable assembles (patch cord, work area cables), `RL`, `NEXT`\n\n-------\n","slug":"20160816","published":1,"updated":"2019-05-11T11:04:24.282Z","comments":1,"photos":[],"link":"","_id":"cjvjhkgda0000nb4thn61tzgo","content":"<h1 id=\"Task-for-today\"><a href=\"#Task-for-today\" class=\"headerlink\" title=\"Task for today\"></a>Task for today</h1><p>Today is the 5th year I came to Sweden, Stockholm. I hope I can become better and better in myself and my everything. Some tasks for today.</p>\n<ul>\n<li>Understand Optical power, average and peak power. And corresponding calculation.</li>\n<li>Verify the code for RRU2217, check the code for set rx and set tx as well.</li>\n<li>Meeting at 12:00 with Carl for DSX-5000.</li>\n<li><p>Go to gym for training.</p>\n<a id=\"more\"></a>\n</li>\n</ul>\n<hr>\n<h2 id=\"Optical-Power\"><a href=\"#Optical-Power\" class=\"headerlink\" title=\"Optical Power\"></a><strong>Optical Power</strong></h2><p>Total power, average power, peak power, what is the meaning for them? How to calculate and the relationship between them</p>\n<blockquote>\n<p>Question from ResearchGate <a href=\"https://www.researchgate.net/post/How_can_I_count_the_total_power_of_the_light_from_the_power_spectrum_measured_by_the_OSA\" target=\"_blank\" rel=\"noopener\">How to count total power from OSA</a></p>\n</blockquote>\n<h3 id=\"1-Peak-power-and-Average-power\"><a href=\"#1-Peak-power-and-Average-power\" class=\"headerlink\" title=\"1. Peak power and Average power\"></a>1. Peak power and Average power</h3><p><a href=\"https://www.newport.com/medias/sys_master/images/images/h8f/h7a/8797052108830/Average-and-Peak-Power-Calculation-Tech-Note-1.pdf\" target=\"_blank\" rel=\"noopener\">Tutorial</a></p>\n<p>In general speaking, Average power is the laser output power from the light souce. The value depend on the souce, e.x, LED souce or other different source. See <a href=\"http://www.coherent.com/downloads/aboutmeasuringlaserpowerndenergyoutputfinal.pdf\" target=\"_blank\" rel=\"noopener\">introduction</a></p>\n<h3 id=\"2-Optical-spectral-power\"><a href=\"#2-Optical-spectral-power\" class=\"headerlink\" title=\"2. Optical spectral power\"></a>2. Optical spectral power</h3><p>Optical spectrum analysis is the measurement of optical power as a function of wavelength. See description <a href=\"http://cp.literature.agilent.com/litweb/pdf/5963-7145E.pdf\" target=\"_blank\" rel=\"noopener\">here</a></p>\n<h3 id=\"3-RJ45-Standards\"><a href=\"#3-RJ45-Standards\" class=\"headerlink\" title=\"3. RJ45 Standards\"></a>3. RJ45 Standards</h3><p><strong>ISO/IEC 11801:1995</strong><br><img src=\"/images/channel1.jpg\" alt=\"Channel and permanent link description\"></p>\n<ul>\n<li>define the channel and permanent link</li>\n<li>Channel excludes the connections at application-specific equipment</li>\n<li>Permanent link is the transmission path includes connections at the ends of linstalled cabling.</li>\n<li>No define for patch cord cable</li>\n</ul>\n<p><strong>ANSI/TIA/EIA-568:A</strong></p>\n<ul>\n<li>clause 6.6, define cord cable, <code>IL</code>, <code>RL</code></li>\n<li>clause 6.8, define connectors, <code>IL</code>, <code>RL</code>, <code>NEXT</code>, <code>FEXT</code></li>\n<li>clause 6.9, define cable assembles (patch cord, work area cables), <code>RL</code>, <code>NEXT</code></li>\n</ul>\n<hr>\n","site":{"data":{}},"excerpt":"<h1 id=\"Task-for-today\"><a href=\"#Task-for-today\" class=\"headerlink\" title=\"Task for today\"></a>Task for today</h1><p>Today is the 5th year I came to Sweden, Stockholm. I hope I can become better and better in myself and my everything. Some tasks for today.</p>\n<ul>\n<li>Understand Optical power, average and peak power. And corresponding calculation.</li>\n<li>Verify the code for RRU2217, check the code for set rx and set tx as well.</li>\n<li>Meeting at 12:00 with Carl for DSX-5000.</li>\n<li><p>Go to gym for training.</p>","more":"</li>\n</ul>\n<hr>\n<h2 id=\"Optical-Power\"><a href=\"#Optical-Power\" class=\"headerlink\" title=\"Optical Power\"></a><strong>Optical Power</strong></h2><p>Total power, average power, peak power, what is the meaning for them? How to calculate and the relationship between them</p>\n<blockquote>\n<p>Question from ResearchGate <a href=\"https://www.researchgate.net/post/How_can_I_count_the_total_power_of_the_light_from_the_power_spectrum_measured_by_the_OSA\" target=\"_blank\" rel=\"noopener\">How to count total power from OSA</a></p>\n</blockquote>\n<h3 id=\"1-Peak-power-and-Average-power\"><a href=\"#1-Peak-power-and-Average-power\" class=\"headerlink\" title=\"1. Peak power and Average power\"></a>1. Peak power and Average power</h3><p><a href=\"https://www.newport.com/medias/sys_master/images/images/h8f/h7a/8797052108830/Average-and-Peak-Power-Calculation-Tech-Note-1.pdf\" target=\"_blank\" rel=\"noopener\">Tutorial</a></p>\n<p>In general speaking, Average power is the laser output power from the light souce. The value depend on the souce, e.x, LED souce or other different source. See <a href=\"http://www.coherent.com/downloads/aboutmeasuringlaserpowerndenergyoutputfinal.pdf\" target=\"_blank\" rel=\"noopener\">introduction</a></p>\n<h3 id=\"2-Optical-spectral-power\"><a href=\"#2-Optical-spectral-power\" class=\"headerlink\" title=\"2. Optical spectral power\"></a>2. Optical spectral power</h3><p>Optical spectrum analysis is the measurement of optical power as a function of wavelength. See description <a href=\"http://cp.literature.agilent.com/litweb/pdf/5963-7145E.pdf\" target=\"_blank\" rel=\"noopener\">here</a></p>\n<h3 id=\"3-RJ45-Standards\"><a href=\"#3-RJ45-Standards\" class=\"headerlink\" title=\"3. RJ45 Standards\"></a>3. RJ45 Standards</h3><p><strong>ISO/IEC 11801:1995</strong><br><img src=\"/images/channel1.jpg\" alt=\"Channel and permanent link description\"></p>\n<ul>\n<li>define the channel and permanent link</li>\n<li>Channel excludes the connections at application-specific equipment</li>\n<li>Permanent link is the transmission path includes connections at the ends of linstalled cabling.</li>\n<li>No define for patch cord cable</li>\n</ul>\n<p><strong>ANSI/TIA/EIA-568:A</strong></p>\n<ul>\n<li>clause 6.6, define cord cable, <code>IL</code>, <code>RL</code></li>\n<li>clause 6.8, define connectors, <code>IL</code>, <code>RL</code>, <code>NEXT</code>, <code>FEXT</code></li>\n<li>clause 6.9, define cable assembles (patch cord, work area cables), <code>RL</code>, <code>NEXT</code></li>\n</ul>\n<hr>"},{"title":"Hexo learning","date":"2016-08-17T18:27:14.000Z","_content":"To start to learn Hexo is a very insteresting thing. It takes time to understand the structure and learn to use git tools, as well as the markdown language.\nFollowing below links to start hexo travel. \n## Basic about Hexo\n> * Hexo main website. [Hexo](https://hexo.io/zh-cn/docs/variables.html)\n> * Hexo and Git, chinese website [Hello dog](https://wsgzao.github.io/post/hexo-guide/)\n> * Theme, [NexT](http://theme-next.iissnan.com/third-party-services.html)\n> * **Markdown** editor, this is web editor [Cmd Markdown](https://www.zybuluo.com/mdeditor)\n> * **Tag plugins**. Hexo official [site](https://hexo.io/docs/tag-plugins.html)\n<!-- more-->\n\n------\n## Examples for plugins.\n\n### 1. If we would like to do a quote, we use below\n\n```mkd\n{% blockquote David Levithan, Wide Awake %}\nDo not just seek happiness for yourself. Seek happiness for all. Through kindness. Through mercy.\n{% endblockquote %}\n```\n\n### 2. If we want to quote a image, it is better to use asset.\n```mkd \n{% asset_img example.jpg This is an example image %}\n```\n\n### 3. To quote a code, we can reference to the [**link**](https://hexo.io/zh-cn/docs/tag-plugins.html#代码块)\n```mkd\n{% codeblock [title] [lang:language] [url] [link text] %}\ncode snippet\n{% endcodeblock %}\n```\nit will render like \n{% codeblock [title] %}\ncode snippet\n{% endcodeblock %}\n\n### 4. Tag plugs example\n```\n{% centerquote %}\nblah blah blah\nWanlu {% endcenterquote %}\n```\n\nwill render as\n{% centerquote %}\nblah blah blah\nWanlu {% endcenterquote %}\n\n### 5. Insert image example\n```\n{% asset_img [class names] /path/to/image [width] [height] [title text [alt text]] %}\n```\nwhich will render as\n{% asset_img image_ex.jpg How to insert image %}\n\n","source":"_posts/Hexo-learning.md","raw":"---\ntitle: Hexo learning\ntags:\n  - hexo\ncategories:\n  - Technology\n  - Hexo\ndate: 2016-08-17 20:27:14\n\n---\nTo start to learn Hexo is a very insteresting thing. It takes time to understand the structure and learn to use git tools, as well as the markdown language.\nFollowing below links to start hexo travel. \n## Basic about Hexo\n> * Hexo main website. [Hexo](https://hexo.io/zh-cn/docs/variables.html)\n> * Hexo and Git, chinese website [Hello dog](https://wsgzao.github.io/post/hexo-guide/)\n> * Theme, [NexT](http://theme-next.iissnan.com/third-party-services.html)\n> * **Markdown** editor, this is web editor [Cmd Markdown](https://www.zybuluo.com/mdeditor)\n> * **Tag plugins**. Hexo official [site](https://hexo.io/docs/tag-plugins.html)\n<!-- more-->\n\n------\n## Examples for plugins.\n\n### 1. If we would like to do a quote, we use below\n\n```mkd\n{% blockquote David Levithan, Wide Awake %}\nDo not just seek happiness for yourself. Seek happiness for all. Through kindness. Through mercy.\n{% endblockquote %}\n```\n\n### 2. If we want to quote a image, it is better to use asset.\n```mkd \n{% asset_img example.jpg This is an example image %}\n```\n\n### 3. To quote a code, we can reference to the [**link**](https://hexo.io/zh-cn/docs/tag-plugins.html#代码块)\n```mkd\n{% codeblock [title] [lang:language] [url] [link text] %}\ncode snippet\n{% endcodeblock %}\n```\nit will render like \n{% codeblock [title] %}\ncode snippet\n{% endcodeblock %}\n\n### 4. Tag plugs example\n```\n{% centerquote %}\nblah blah blah\nWanlu {% endcenterquote %}\n```\n\nwill render as\n{% centerquote %}\nblah blah blah\nWanlu {% endcenterquote %}\n\n### 5. Insert image example\n```\n{% asset_img [class names] /path/to/image [width] [height] [title text [alt text]] %}\n```\nwhich will render as\n{% asset_img image_ex.jpg How to insert image %}\n\n","slug":"Hexo-learning","published":1,"updated":"2019-05-11T11:04:24.283Z","comments":1,"layout":"post","photos":[],"link":"","_id":"cjvjhkgdf0002nb4tv16yq1j0"},{"title":"Oscilloscope","date":"2016-08-24T07:58:54.000Z","_content":"\nA real-time Oscilloscope also called a \"single shot\" scope, it captures an entire waveform on each trigger even. A large number of points are captured in one continous record. [1](http://cp.literature.agilent.com/litweb/pdf/5989-8794EN.pdf) To beeter understand, it is like a fast analog-to-digital converter (ADC), in this case, the sample rate determins the sampling space and memory depth determines points that collected and displayed. In this case, it means that the sample rate need to be much faster than the frequency of the incoming waveform, can be up to 80GSa/s or more, and bandwidth has reached 63Ghz.\n","source":"_posts/Oscilloscope.md","raw":"---\ntitle: Oscilloscope\ndate: 2016-08-24 09:58:54\ntags:\n- oscilloscope\n- sampling osc\n- realtime osc\n\ncategories:\n- Technology\n---\n\nA real-time Oscilloscope also called a \"single shot\" scope, it captures an entire waveform on each trigger even. A large number of points are captured in one continous record. [1](http://cp.literature.agilent.com/litweb/pdf/5989-8794EN.pdf) To beeter understand, it is like a fast analog-to-digital converter (ADC), in this case, the sample rate determins the sampling space and memory depth determines points that collected and displayed. In this case, it means that the sample rate need to be much faster than the frequency of the incoming waveform, can be up to 80GSa/s or more, and bandwidth has reached 63Ghz.\n","slug":"Oscilloscope","published":1,"updated":"2019-05-11T11:04:24.284Z","comments":1,"layout":"post","photos":[],"link":"","_id":"cjvjhkgdj0006nb4tp9zxmdvx","content":"<p>A real-time Oscilloscope also called a “single shot” scope, it captures an entire waveform on each trigger even. A large number of points are captured in one continous record. <a href=\"http://cp.literature.agilent.com/litweb/pdf/5989-8794EN.pdf\" target=\"_blank\" rel=\"noopener\">1</a> To beeter understand, it is like a fast analog-to-digital converter (ADC), in this case, the sample rate determins the sampling space and memory depth determines points that collected and displayed. In this case, it means that the sample rate need to be much faster than the frequency of the incoming waveform, can be up to 80GSa/s or more, and bandwidth has reached 63Ghz.</p>\n","site":{"data":{}},"excerpt":"","more":"<p>A real-time Oscilloscope also called a “single shot” scope, it captures an entire waveform on each trigger even. A large number of points are captured in one continous record. <a href=\"http://cp.literature.agilent.com/litweb/pdf/5989-8794EN.pdf\" target=\"_blank\" rel=\"noopener\">1</a> To beeter understand, it is like a fast analog-to-digital converter (ADC), in this case, the sample rate determins the sampling space and memory depth determines points that collected and displayed. In this case, it means that the sample rate need to be much faster than the frequency of the incoming waveform, can be up to 80GSa/s or more, and bandwidth has reached 63Ghz.</p>\n"},{"title":"SFP Module_Limiting & Linear Interface","date":"2016-08-22T11:10:14.000Z","_content":"There are always saying two different types of SFP+ Modules, limiting and linear, as well as Direct Attach Cable (DAC). What is the difference and relationship between? \nAccording to [Wikipedia](https://en.wikipedia.org/wiki/Small_form-factor_pluggable_transceiver#cite_note-15):\nSFP+ modules can be described as 'limiting' or 'linear' types; this describes the functionality of the inbuilt electronics. \n- Limiting SFP+ modules include a signal amplifier to re-shape the (degraded) received signal whereas linear ones do not. \n- Linear modules are mainly used with the low bandwidth standards such as [10GBASE-LRM](https://en.wikipedia.org/wiki/10_Gigabit_Ethernet#10GBASE-LRM); otherwise, limiting modules are preferred.\n<!-- more-->\n\n\n## SFP+ design\nA detail explaination of limiting and linear module are descripbed in the article [*The road to SFP+: Examining module and system architectures*](http://www.lightwaveonline.com/articles/2008/01/the-road-to-sfp-examining-module-and-system-architectures-54884162.html). \nSee below figure\n\n\nCurrent Module, `Limiting Module` variant, includes a laser driver, a TOSA, a ROSA, and a **limiting amplifier**. The other variant, `Linear Module`, is majorly intended for 10G Ethernet LRM applications, requires a linear optical receiver path. The third is `Retimed Module` which is compliant with SFP+, it integrates CDR funtionality within the Tx and/or Rx path and resolves signal integrity challenges to many high-speed systems.\n{% asset_img sfpdesign.png Three variants of SFP+ design %}\n\n## Trasmission Design\nIn transmit direction, there is no difference between limiting and linear module. SFP specification has not requirement for ASIC/SerDes but only at point B. More information check [link](http://www.lightwaveonline.com/articles/2008/01/the-road-to-sfp-examining-module-and-system-architectures-54884162.html).\n\n## Receive Design\nIn receive direction, three variants are significantly differ.\n\n- **Limiting interface**, a binary 1/0 decision is made in amplitude but not in time. This results in squaring of the waveform, but jitter from the signal after O-to-E conversion is still present at the SFP+ connector. This is reflected in the limiting output jitter specification for Fibre Channel and Ethernet (draft values 0.71 UIpp and 0.7 UIpp, ­respectively). \n\n\n- The second receive interface type is called the **Linear interface** because the entire input path is kept linear so electronic dispersion compensation (EDC) ICs on the host board can attempt to recover highly impaired signals. This module type is primarily targeted at 10-Gigabit Ethernet LRM applications, where signals must be sent over long distances of legacy multimode fiber. In the case of a linear interface, the received eye can be totally closed, making jitter measurements in terms of UI not meaningful.\n  The linear module type shifts the majority of the standard compliance onto the host board since 1/0 decisions are not made within the module at all.\n  *Linear modules also typically have lower gain than limiting modules, making output amplitudes smaller and potentially more difficult for hosts to recover. *\n\n## Direct Attach Cable\nIn [SFF-8431](ftp://ftp.seagate.com/sff/SFF-8431.PDF), SFP+ compliant hosts are permitted to support just linear modules, just limiting modules, or both linear and limiting modules. Linear modules are modules which contain a linear receiver. Limiting modules are modules which contain a limiting receiver. Although not required, host supporting linear specification are encouraged to support 10GSFP+Cu direct attach cables (Appendix E). For other copper variants see SFF-8461.\n{% asset_img copper_cable.jpg Copper Cable structure %}\n\n\n## Jitter measurement\nRelated specification only provides requirement of jitter at B point. There are many factors contributes the jitter. As shown in figure below, They include \n \n * 1) ASIC/SerDes output jitter (includes silicon performance, IC package, etc.); \n * 2) ASIC/SerDes pre-emphasis set point accuracy and variation; \n * 3) SFI channel loss with variation (temperature, humidity, manufacturing, etc.); \n * 4) SFI channel return loss with variation; and \n * 5) crosstalk, which can be a source of pulsewidth shrinkage (PWS). \n{% asset_img jitter.png Jitter %}\n\nDeterministic jitter is combination of the above contributors plus optical module. ** WHat is [deterministic jitter](http://www.ieee802.org/3/ba/public/jan09/li_01_0109.pdf) **. In the lab test, total jitter may be less than individual measured jitter, so the determinstic jitter is cancling out. ","source":"_posts/SFP-Module.md","raw":"---\ntitle: SFP Module_Limiting & Linear Interface\ndate: 2016-08-22 13:10:14\ntags:\n- SFP\n- limiting, linear\n- Direct Attach Cable\n- jitter\ncategories:\n- Technology\n---\nThere are always saying two different types of SFP+ Modules, limiting and linear, as well as Direct Attach Cable (DAC). What is the difference and relationship between? \nAccording to [Wikipedia](https://en.wikipedia.org/wiki/Small_form-factor_pluggable_transceiver#cite_note-15):\nSFP+ modules can be described as 'limiting' or 'linear' types; this describes the functionality of the inbuilt electronics. \n- Limiting SFP+ modules include a signal amplifier to re-shape the (degraded) received signal whereas linear ones do not. \n- Linear modules are mainly used with the low bandwidth standards such as [10GBASE-LRM](https://en.wikipedia.org/wiki/10_Gigabit_Ethernet#10GBASE-LRM); otherwise, limiting modules are preferred.\n<!-- more-->\n\n\n## SFP+ design\nA detail explaination of limiting and linear module are descripbed in the article [*The road to SFP+: Examining module and system architectures*](http://www.lightwaveonline.com/articles/2008/01/the-road-to-sfp-examining-module-and-system-architectures-54884162.html). \nSee below figure\n\n\nCurrent Module, `Limiting Module` variant, includes a laser driver, a TOSA, a ROSA, and a **limiting amplifier**. The other variant, `Linear Module`, is majorly intended for 10G Ethernet LRM applications, requires a linear optical receiver path. The third is `Retimed Module` which is compliant with SFP+, it integrates CDR funtionality within the Tx and/or Rx path and resolves signal integrity challenges to many high-speed systems.\n{% asset_img sfpdesign.png Three variants of SFP+ design %}\n\n## Trasmission Design\nIn transmit direction, there is no difference between limiting and linear module. SFP specification has not requirement for ASIC/SerDes but only at point B. More information check [link](http://www.lightwaveonline.com/articles/2008/01/the-road-to-sfp-examining-module-and-system-architectures-54884162.html).\n\n## Receive Design\nIn receive direction, three variants are significantly differ.\n\n- **Limiting interface**, a binary 1/0 decision is made in amplitude but not in time. This results in squaring of the waveform, but jitter from the signal after O-to-E conversion is still present at the SFP+ connector. This is reflected in the limiting output jitter specification for Fibre Channel and Ethernet (draft values 0.71 UIpp and 0.7 UIpp, ­respectively). \n\n\n- The second receive interface type is called the **Linear interface** because the entire input path is kept linear so electronic dispersion compensation (EDC) ICs on the host board can attempt to recover highly impaired signals. This module type is primarily targeted at 10-Gigabit Ethernet LRM applications, where signals must be sent over long distances of legacy multimode fiber. In the case of a linear interface, the received eye can be totally closed, making jitter measurements in terms of UI not meaningful.\n  The linear module type shifts the majority of the standard compliance onto the host board since 1/0 decisions are not made within the module at all.\n  *Linear modules also typically have lower gain than limiting modules, making output amplitudes smaller and potentially more difficult for hosts to recover. *\n\n## Direct Attach Cable\nIn [SFF-8431](ftp://ftp.seagate.com/sff/SFF-8431.PDF), SFP+ compliant hosts are permitted to support just linear modules, just limiting modules, or both linear and limiting modules. Linear modules are modules which contain a linear receiver. Limiting modules are modules which contain a limiting receiver. Although not required, host supporting linear specification are encouraged to support 10GSFP+Cu direct attach cables (Appendix E). For other copper variants see SFF-8461.\n{% asset_img copper_cable.jpg Copper Cable structure %}\n\n\n## Jitter measurement\nRelated specification only provides requirement of jitter at B point. There are many factors contributes the jitter. As shown in figure below, They include \n \n * 1) ASIC/SerDes output jitter (includes silicon performance, IC package, etc.); \n * 2) ASIC/SerDes pre-emphasis set point accuracy and variation; \n * 3) SFI channel loss with variation (temperature, humidity, manufacturing, etc.); \n * 4) SFI channel return loss with variation; and \n * 5) crosstalk, which can be a source of pulsewidth shrinkage (PWS). \n{% asset_img jitter.png Jitter %}\n\nDeterministic jitter is combination of the above contributors plus optical module. ** WHat is [deterministic jitter](http://www.ieee802.org/3/ba/public/jan09/li_01_0109.pdf) **. In the lab test, total jitter may be less than individual measured jitter, so the determinstic jitter is cancling out. ","slug":"SFP-Module","published":1,"updated":"2019-05-11T11:04:24.284Z","comments":1,"layout":"post","photos":[],"link":"","_id":"cjvjhkgdk0007nb4tvgwqk7kn","content":"<p>There are always saying two different types of SFP+ Modules, limiting and linear, as well as Direct Attach Cable (DAC). What is the difference and relationship between?<br>According to <a href=\"https://en.wikipedia.org/wiki/Small_form-factor_pluggable_transceiver#cite_note-15\" target=\"_blank\" rel=\"noopener\">Wikipedia</a>:<br>SFP+ modules can be described as ‘limiting’ or ‘linear’ types; this describes the functionality of the inbuilt electronics. </p>\n<ul>\n<li>Limiting SFP+ modules include a signal amplifier to re-shape the (degraded) received signal whereas linear ones do not. </li>\n<li>Linear modules are mainly used with the low bandwidth standards such as <a href=\"https://en.wikipedia.org/wiki/10_Gigabit_Ethernet#10GBASE-LRM\" target=\"_blank\" rel=\"noopener\">10GBASE-LRM</a>; otherwise, limiting modules are preferred.<a id=\"more\"></a>\n</li>\n</ul>\n<h2 id=\"SFP-design\"><a href=\"#SFP-design\" class=\"headerlink\" title=\"SFP+ design\"></a>SFP+ design</h2><p>A detail explaination of limiting and linear module are descripbed in the article <a href=\"http://www.lightwaveonline.com/articles/2008/01/the-road-to-sfp-examining-module-and-system-architectures-54884162.html\" target=\"_blank\" rel=\"noopener\"><em>The road to SFP+: Examining module and system architectures</em></a>.<br>See below figure</p>\n<p>Current Module, <code>Limiting Module</code> variant, includes a laser driver, a TOSA, a ROSA, and a <strong>limiting amplifier</strong>. The other variant, <code>Linear Module</code>, is majorly intended for 10G Ethernet LRM applications, requires a linear optical receiver path. The third is <code>Retimed Module</code> which is compliant with SFP+, it integrates CDR funtionality within the Tx and/or Rx path and resolves signal integrity challenges to many high-speed systems.<br><img src=\"/en/2016/08/22/SFP-Module/sfpdesign.png\" title=\"Three variants of SFP+ design\"></p>\n<h2 id=\"Trasmission-Design\"><a href=\"#Trasmission-Design\" class=\"headerlink\" title=\"Trasmission Design\"></a>Trasmission Design</h2><p>In transmit direction, there is no difference between limiting and linear module. SFP specification has not requirement for ASIC/SerDes but only at point B. More information check <a href=\"http://www.lightwaveonline.com/articles/2008/01/the-road-to-sfp-examining-module-and-system-architectures-54884162.html\" target=\"_blank\" rel=\"noopener\">link</a>.</p>\n<h2 id=\"Receive-Design\"><a href=\"#Receive-Design\" class=\"headerlink\" title=\"Receive Design\"></a>Receive Design</h2><p>In receive direction, three variants are significantly differ.</p>\n<ul>\n<li><strong>Limiting interface</strong>, a binary 1/0 decision is made in amplitude but not in time. This results in squaring of the waveform, but jitter from the signal after O-to-E conversion is still present at the SFP+ connector. This is reflected in the limiting output jitter specification for Fibre Channel and Ethernet (draft values 0.71 UIpp and 0.7 UIpp, ­respectively). </li>\n</ul>\n<ul>\n<li>The second receive interface type is called the <strong>Linear interface</strong> because the entire input path is kept linear so electronic dispersion compensation (EDC) ICs on the host board can attempt to recover highly impaired signals. This module type is primarily targeted at 10-Gigabit Ethernet LRM applications, where signals must be sent over long distances of legacy multimode fiber. In the case of a linear interface, the received eye can be totally closed, making jitter measurements in terms of UI not meaningful.<br>The linear module type shifts the majority of the standard compliance onto the host board since 1/0 decisions are not made within the module at all.<br><em>Linear modules also typically have lower gain than limiting modules, making output amplitudes smaller and potentially more difficult for hosts to recover. </em></li>\n</ul>\n<h2 id=\"Direct-Attach-Cable\"><a href=\"#Direct-Attach-Cable\" class=\"headerlink\" title=\"Direct Attach Cable\"></a>Direct Attach Cable</h2><p>In <a href=\"ftp://ftp.seagate.com/sff/SFF-8431.PDF\" target=\"_blank\" rel=\"noopener\">SFF-8431</a>, SFP+ compliant hosts are permitted to support just linear modules, just limiting modules, or both linear and limiting modules. Linear modules are modules which contain a linear receiver. Limiting modules are modules which contain a limiting receiver. Although not required, host supporting linear specification are encouraged to support 10GSFP+Cu direct attach cables (Appendix E). For other copper variants see SFF-8461.<br><img src=\"/en/2016/08/22/SFP-Module/copper_cable.jpg\" title=\"Copper Cable structure\"></p>\n<h2 id=\"Jitter-measurement\"><a href=\"#Jitter-measurement\" class=\"headerlink\" title=\"Jitter measurement\"></a>Jitter measurement</h2><p>Related specification only provides requirement of jitter at B point. There are many factors contributes the jitter. As shown in figure below, They include </p>\n<ul>\n<li>1) ASIC/SerDes output jitter (includes silicon performance, IC package, etc.); </li>\n<li>2) ASIC/SerDes pre-emphasis set point accuracy and variation; </li>\n<li>3) SFI channel loss with variation (temperature, humidity, manufacturing, etc.); </li>\n<li>4) SFI channel return loss with variation; and </li>\n<li>5) crosstalk, which can be a source of pulsewidth shrinkage (PWS). <img src=\"/en/2016/08/22/SFP-Module/jitter.png\" title=\"Jitter\">\n</li>\n</ul>\n<p>Deterministic jitter is combination of the above contributors plus optical module. <strong> WHat is <a href=\"http://www.ieee802.org/3/ba/public/jan09/li_01_0109.pdf\" target=\"_blank\" rel=\"noopener\">deterministic jitter</a> </strong>. In the lab test, total jitter may be less than individual measured jitter, so the determinstic jitter is cancling out. </p>\n","site":{"data":{}},"excerpt":"<p>There are always saying two different types of SFP+ Modules, limiting and linear, as well as Direct Attach Cable (DAC). What is the difference and relationship between?<br>According to <a href=\"https://en.wikipedia.org/wiki/Small_form-factor_pluggable_transceiver#cite_note-15\" target=\"_blank\" rel=\"noopener\">Wikipedia</a>:<br>SFP+ modules can be described as ‘limiting’ or ‘linear’ types; this describes the functionality of the inbuilt electronics. </p>\n<ul>\n<li>Limiting SFP+ modules include a signal amplifier to re-shape the (degraded) received signal whereas linear ones do not. </li>\n<li>Linear modules are mainly used with the low bandwidth standards such as <a href=\"https://en.wikipedia.org/wiki/10_Gigabit_Ethernet#10GBASE-LRM\" target=\"_blank\" rel=\"noopener\">10GBASE-LRM</a>; otherwise, limiting modules are preferred.","more":"</li>\n</ul>\n<h2 id=\"SFP-design\"><a href=\"#SFP-design\" class=\"headerlink\" title=\"SFP+ design\"></a>SFP+ design</h2><p>A detail explaination of limiting and linear module are descripbed in the article <a href=\"http://www.lightwaveonline.com/articles/2008/01/the-road-to-sfp-examining-module-and-system-architectures-54884162.html\" target=\"_blank\" rel=\"noopener\"><em>The road to SFP+: Examining module and system architectures</em></a>.<br>See below figure</p>\n<p>Current Module, <code>Limiting Module</code> variant, includes a laser driver, a TOSA, a ROSA, and a <strong>limiting amplifier</strong>. The other variant, <code>Linear Module</code>, is majorly intended for 10G Ethernet LRM applications, requires a linear optical receiver path. The third is <code>Retimed Module</code> which is compliant with SFP+, it integrates CDR funtionality within the Tx and/or Rx path and resolves signal integrity challenges to many high-speed systems.<br><img src=\"/en/2016/08/22/SFP-Module/sfpdesign.png\" title=\"Three variants of SFP+ design\"></p>\n<h2 id=\"Trasmission-Design\"><a href=\"#Trasmission-Design\" class=\"headerlink\" title=\"Trasmission Design\"></a>Trasmission Design</h2><p>In transmit direction, there is no difference between limiting and linear module. SFP specification has not requirement for ASIC/SerDes but only at point B. More information check <a href=\"http://www.lightwaveonline.com/articles/2008/01/the-road-to-sfp-examining-module-and-system-architectures-54884162.html\" target=\"_blank\" rel=\"noopener\">link</a>.</p>\n<h2 id=\"Receive-Design\"><a href=\"#Receive-Design\" class=\"headerlink\" title=\"Receive Design\"></a>Receive Design</h2><p>In receive direction, three variants are significantly differ.</p>\n<ul>\n<li><strong>Limiting interface</strong>, a binary 1/0 decision is made in amplitude but not in time. This results in squaring of the waveform, but jitter from the signal after O-to-E conversion is still present at the SFP+ connector. This is reflected in the limiting output jitter specification for Fibre Channel and Ethernet (draft values 0.71 UIpp and 0.7 UIpp, ­respectively). </li>\n</ul>\n<ul>\n<li>The second receive interface type is called the <strong>Linear interface</strong> because the entire input path is kept linear so electronic dispersion compensation (EDC) ICs on the host board can attempt to recover highly impaired signals. This module type is primarily targeted at 10-Gigabit Ethernet LRM applications, where signals must be sent over long distances of legacy multimode fiber. In the case of a linear interface, the received eye can be totally closed, making jitter measurements in terms of UI not meaningful.<br>The linear module type shifts the majority of the standard compliance onto the host board since 1/0 decisions are not made within the module at all.<br><em>Linear modules also typically have lower gain than limiting modules, making output amplitudes smaller and potentially more difficult for hosts to recover. </em></li>\n</ul>\n<h2 id=\"Direct-Attach-Cable\"><a href=\"#Direct-Attach-Cable\" class=\"headerlink\" title=\"Direct Attach Cable\"></a>Direct Attach Cable</h2><p>In <a href=\"ftp://ftp.seagate.com/sff/SFF-8431.PDF\" target=\"_blank\" rel=\"noopener\">SFF-8431</a>, SFP+ compliant hosts are permitted to support just linear modules, just limiting modules, or both linear and limiting modules. Linear modules are modules which contain a linear receiver. Limiting modules are modules which contain a limiting receiver. Although not required, host supporting linear specification are encouraged to support 10GSFP+Cu direct attach cables (Appendix E). For other copper variants see SFF-8461.<br><img src=\"/en/2016/08/22/SFP-Module/copper_cable.jpg\" title=\"Copper Cable structure\"></p>\n<h2 id=\"Jitter-measurement\"><a href=\"#Jitter-measurement\" class=\"headerlink\" title=\"Jitter measurement\"></a>Jitter measurement</h2><p>Related specification only provides requirement of jitter at B point. There are many factors contributes the jitter. As shown in figure below, They include </p>\n<ul>\n<li>1) ASIC/SerDes output jitter (includes silicon performance, IC package, etc.); </li>\n<li>2) ASIC/SerDes pre-emphasis set point accuracy and variation; </li>\n<li>3) SFI channel loss with variation (temperature, humidity, manufacturing, etc.); </li>\n<li>4) SFI channel return loss with variation; and </li>\n<li>5) crosstalk, which can be a source of pulsewidth shrinkage (PWS). <img src=\"/en/2016/08/22/SFP-Module/jitter.png\" title=\"Jitter\">\n</li>\n</ul>\n<p>Deterministic jitter is combination of the above contributors plus optical module. <strong> WHat is <a href=\"http://www.ieee802.org/3/ba/public/jan09/li_01_0109.pdf\" target=\"_blank\" rel=\"noopener\">deterministic jitter</a> </strong>. In the lab test, total jitter may be less than individual measured jitter, so the determinstic jitter is cancling out. </p>"},{"layout":"blah","title":"Blah blah blah","date":"2016-08-19T13:06:48.000Z","_content":"\nI am on period today... So that is easy to explain why I want to blah blah so much. I'm thinking about why wrote this blog, there must be some reason so I can continue. Something like moving on the next step for working cause I just had a IPM meeting with my manager, she talks nicely and encouraged quite little. Made me thinking that I should think more about my career, not just finish daily work and tasks. \nAgain, to make everything clear, I always need some kind of list to see my going. Anyway, I'm not feeling well today, I do not need to talk very well either. Gonna drink more hot water and brown sugar with ginger I guess... \n\nI'm still reading *Moon and the sixpence*. Hopefully to finish it within this week. What I should do with my Svenska!!!!!! OMG!!!\n可以写中文吗？中文字体是什么？\n<!--more-->\n## Books\n> 1. ** Moon and the sixpence**, on going\n> 2. Gone with the wind, next\n> 3. 万历十五年，next\n> 4. Pride and Prejudice, next\n\n## Svenska\n> 1. Apply for SAS course before August, or continue with folkuniversitet. [**Komvux**](http://www.komvuxutbildningar.se/utbildning/svenska).\n> 2. Read one article every day and put in the blog for new words, sentences and grammar.\n\n## Living style\nHard to say. From where, I do not know. Maybe *Game of Thrones*, *Orange is another Black*.","source":"_posts/blah.md","raw":"layout: blah\ntitle: Blah blah blah\ndate: 2016-08-19 15:06:48\ntags:\n- nonsense\n- thinking\ncategories:\n- living\n- \n---\n\nI am on period today... So that is easy to explain why I want to blah blah so much. I'm thinking about why wrote this blog, there must be some reason so I can continue. Something like moving on the next step for working cause I just had a IPM meeting with my manager, she talks nicely and encouraged quite little. Made me thinking that I should think more about my career, not just finish daily work and tasks. \nAgain, to make everything clear, I always need some kind of list to see my going. Anyway, I'm not feeling well today, I do not need to talk very well either. Gonna drink more hot water and brown sugar with ginger I guess... \n\nI'm still reading *Moon and the sixpence*. Hopefully to finish it within this week. What I should do with my Svenska!!!!!! OMG!!!\n可以写中文吗？中文字体是什么？\n<!--more-->\n## Books\n> 1. ** Moon and the sixpence**, on going\n> 2. Gone with the wind, next\n> 3. 万历十五年，next\n> 4. Pride and Prejudice, next\n\n## Svenska\n> 1. Apply for SAS course before August, or continue with folkuniversitet. [**Komvux**](http://www.komvuxutbildningar.se/utbildning/svenska).\n> 2. Read one article every day and put in the blog for new words, sentences and grammar.\n\n## Living style\nHard to say. From where, I do not know. Maybe *Game of Thrones*, *Orange is another Black*.","slug":"blah","published":1,"updated":"2019-05-11T11:04:24.286Z","comments":1,"photos":[],"link":"","_id":"cjvjhkgdl0008nb4tcrny9nya","content":"<p>I am on period today… So that is easy to explain why I want to blah blah so much. I’m thinking about why wrote this blog, there must be some reason so I can continue. Something like moving on the next step for working cause I just had a IPM meeting with my manager, she talks nicely and encouraged quite little. Made me thinking that I should think more about my career, not just finish daily work and tasks.<br>Again, to make everything clear, I always need some kind of list to see my going. Anyway, I’m not feeling well today, I do not need to talk very well either. Gonna drink more hot water and brown sugar with ginger I guess… </p>\n<p>I’m still reading <em>Moon and the sixpence</em>. Hopefully to finish it within this week. What I should do with my Svenska!!!!!! OMG!!!<br>可以写中文吗？中文字体是什么？<br><a id=\"more\"></a></p>\n<h2 id=\"Books\"><a href=\"#Books\" class=\"headerlink\" title=\"Books\"></a>Books</h2><blockquote>\n<ol>\n<li><strong> Moon and the sixpence</strong>, on going</li>\n<li>Gone with the wind, next</li>\n<li>万历十五年，next</li>\n<li>Pride and Prejudice, next</li>\n</ol>\n</blockquote>\n<h2 id=\"Svenska\"><a href=\"#Svenska\" class=\"headerlink\" title=\"Svenska\"></a>Svenska</h2><blockquote>\n<ol>\n<li>Apply for SAS course before August, or continue with folkuniversitet. <a href=\"http://www.komvuxutbildningar.se/utbildning/svenska\" target=\"_blank\" rel=\"noopener\"><strong>Komvux</strong></a>.</li>\n<li>Read one article every day and put in the blog for new words, sentences and grammar.</li>\n</ol>\n</blockquote>\n<h2 id=\"Living-style\"><a href=\"#Living-style\" class=\"headerlink\" title=\"Living style\"></a>Living style</h2><p>Hard to say. From where, I do not know. Maybe <em>Game of Thrones</em>, <em>Orange is another Black</em>.</p>\n","site":{"data":{}},"excerpt":"<p>I am on period today… So that is easy to explain why I want to blah blah so much. I’m thinking about why wrote this blog, there must be some reason so I can continue. Something like moving on the next step for working cause I just had a IPM meeting with my manager, she talks nicely and encouraged quite little. Made me thinking that I should think more about my career, not just finish daily work and tasks.<br>Again, to make everything clear, I always need some kind of list to see my going. Anyway, I’m not feeling well today, I do not need to talk very well either. Gonna drink more hot water and brown sugar with ginger I guess… </p>\n<p>I’m still reading <em>Moon and the sixpence</em>. Hopefully to finish it within this week. What I should do with my Svenska!!!!!! OMG!!!<br>可以写中文吗？中文字体是什么？<br>","more":"</p>\n<h2 id=\"Books\"><a href=\"#Books\" class=\"headerlink\" title=\"Books\"></a>Books</h2><blockquote>\n<ol>\n<li><strong> Moon and the sixpence</strong>, on going</li>\n<li>Gone with the wind, next</li>\n<li>万历十五年，next</li>\n<li>Pride and Prejudice, next</li>\n</ol>\n</blockquote>\n<h2 id=\"Svenska\"><a href=\"#Svenska\" class=\"headerlink\" title=\"Svenska\"></a>Svenska</h2><blockquote>\n<ol>\n<li>Apply for SAS course before August, or continue with folkuniversitet. <a href=\"http://www.komvuxutbildningar.se/utbildning/svenska\" target=\"_blank\" rel=\"noopener\"><strong>Komvux</strong></a>.</li>\n<li>Read one article every day and put in the blog for new words, sentences and grammar.</li>\n</ol>\n</blockquote>\n<h2 id=\"Living-style\"><a href=\"#Living-style\" class=\"headerlink\" title=\"Living style\"></a>Living style</h2><p>Hard to say. From where, I do not know. Maybe <em>Game of Thrones</em>, <em>Orange is another Black</em>.</p>"},{"title":"Hello World","_content":"Welcome to [Hexo](https://hexo.io/)! This is your very first post. Check [documentation](https://hexo.io/docs/) for more info. If you get any problems when using Hexo, you can find the answer in [troubleshooting](https://hexo.io/docs/troubleshooting.html) or you can ask me on [GitHub](https://github.com/hexojs/hexo/issues).\n\n## Quick Start\n\n### Create a new post\n\n``` bash\n$ hexo new \"My New Post\"\n```\n\nMore info: [Writing](https://hexo.io/docs/writing.html)\n\n### Run server\n\n``` bash\n$ hexo server\n```\n\nMore info: [Server](https://hexo.io/docs/server.html)\n\n### Generate static files\n\n``` bash\n$ hexo generate\n```\n\nMore info: [Generating](https://hexo.io/docs/generating.html)\n\n### Deploy to remote sites\n\n``` bash\n$ hexo deploy\n```\n\nMore info: [Deployment](https://hexo.io/docs/deployment.html)\n","source":"_posts/hello-world.md","raw":"---\ntitle: Hello World\n---\nWelcome to [Hexo](https://hexo.io/)! This is your very first post. Check [documentation](https://hexo.io/docs/) for more info. If you get any problems when using Hexo, you can find the answer in [troubleshooting](https://hexo.io/docs/troubleshooting.html) or you can ask me on [GitHub](https://github.com/hexojs/hexo/issues).\n\n## Quick Start\n\n### Create a new post\n\n``` bash\n$ hexo new \"My New Post\"\n```\n\nMore info: [Writing](https://hexo.io/docs/writing.html)\n\n### Run server\n\n``` bash\n$ hexo server\n```\n\nMore info: [Server](https://hexo.io/docs/server.html)\n\n### Generate static files\n\n``` bash\n$ hexo generate\n```\n\nMore info: [Generating](https://hexo.io/docs/generating.html)\n\n### Deploy to remote sites\n\n``` bash\n$ hexo deploy\n```\n\nMore info: [Deployment](https://hexo.io/docs/deployment.html)\n","slug":"hello-world","published":1,"date":"2019-05-11T11:04:24.286Z","updated":"2019-05-11T11:04:24.286Z","comments":1,"layout":"post","photos":[],"link":"","_id":"cjvjhkgdn000bnb4tq3gpbimk","content":"<p>Welcome to <a href=\"https://hexo.io/\" target=\"_blank\" rel=\"noopener\">Hexo</a>! This is your very first post. Check <a href=\"https://hexo.io/docs/\" target=\"_blank\" rel=\"noopener\">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a href=\"https://hexo.io/docs/troubleshooting.html\" target=\"_blank\" rel=\"noopener\">troubleshooting</a> or you can ask me on <a href=\"https://github.com/hexojs/hexo/issues\" target=\"_blank\" rel=\"noopener\">GitHub</a>.</p>\n<h2 id=\"Quick-Start\"><a href=\"#Quick-Start\" class=\"headerlink\" title=\"Quick Start\"></a>Quick Start</h2><h3 id=\"Create-a-new-post\"><a href=\"#Create-a-new-post\" class=\"headerlink\" title=\"Create a new post\"></a>Create a new post</h3><figure class=\"highlight bash\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">$ hexo new <span class=\"string\">\"My New Post\"</span></span><br></pre></td></tr></table></figure>\n<p>More info: <a href=\"https://hexo.io/docs/writing.html\" target=\"_blank\" rel=\"noopener\">Writing</a></p>\n<h3 id=\"Run-server\"><a href=\"#Run-server\" class=\"headerlink\" title=\"Run server\"></a>Run server</h3><figure class=\"highlight bash\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">$ hexo server</span><br></pre></td></tr></table></figure>\n<p>More info: <a href=\"https://hexo.io/docs/server.html\" target=\"_blank\" rel=\"noopener\">Server</a></p>\n<h3 id=\"Generate-static-files\"><a href=\"#Generate-static-files\" class=\"headerlink\" title=\"Generate static files\"></a>Generate static files</h3><figure class=\"highlight bash\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">$ hexo generate</span><br></pre></td></tr></table></figure>\n<p>More info: <a href=\"https://hexo.io/docs/generating.html\" target=\"_blank\" rel=\"noopener\">Generating</a></p>\n<h3 id=\"Deploy-to-remote-sites\"><a href=\"#Deploy-to-remote-sites\" class=\"headerlink\" title=\"Deploy to remote sites\"></a>Deploy to remote sites</h3><figure class=\"highlight bash\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">$ hexo deploy</span><br></pre></td></tr></table></figure>\n<p>More info: <a href=\"https://hexo.io/docs/deployment.html\" target=\"_blank\" rel=\"noopener\">Deployment</a></p>\n","site":{"data":{}},"excerpt":"","more":"<p>Welcome to <a href=\"https://hexo.io/\" target=\"_blank\" rel=\"noopener\">Hexo</a>! This is your very first post. Check <a href=\"https://hexo.io/docs/\" target=\"_blank\" rel=\"noopener\">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a href=\"https://hexo.io/docs/troubleshooting.html\" target=\"_blank\" rel=\"noopener\">troubleshooting</a> or you can ask me on <a href=\"https://github.com/hexojs/hexo/issues\" target=\"_blank\" rel=\"noopener\">GitHub</a>.</p>\n<h2 id=\"Quick-Start\"><a href=\"#Quick-Start\" class=\"headerlink\" title=\"Quick Start\"></a>Quick Start</h2><h3 id=\"Create-a-new-post\"><a href=\"#Create-a-new-post\" class=\"headerlink\" title=\"Create a new post\"></a>Create a new post</h3><figure class=\"highlight bash\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">$ hexo new <span class=\"string\">\"My New Post\"</span></span><br></pre></td></tr></table></figure>\n<p>More info: <a href=\"https://hexo.io/docs/writing.html\" target=\"_blank\" rel=\"noopener\">Writing</a></p>\n<h3 id=\"Run-server\"><a href=\"#Run-server\" class=\"headerlink\" title=\"Run server\"></a>Run server</h3><figure class=\"highlight bash\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">$ hexo server</span><br></pre></td></tr></table></figure>\n<p>More info: <a href=\"https://hexo.io/docs/server.html\" target=\"_blank\" rel=\"noopener\">Server</a></p>\n<h3 id=\"Generate-static-files\"><a href=\"#Generate-static-files\" class=\"headerlink\" title=\"Generate static files\"></a>Generate static files</h3><figure class=\"highlight bash\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">$ hexo generate</span><br></pre></td></tr></table></figure>\n<p>More info: <a href=\"https://hexo.io/docs/generating.html\" target=\"_blank\" rel=\"noopener\">Generating</a></p>\n<h3 id=\"Deploy-to-remote-sites\"><a href=\"#Deploy-to-remote-sites\" class=\"headerlink\" title=\"Deploy to remote sites\"></a>Deploy to remote sites</h3><figure class=\"highlight bash\"><table><tr><td class=\"gutter\"><pre><span class=\"line\">1</span><br></pre></td><td class=\"code\"><pre><span class=\"line\">$ hexo deploy</span><br></pre></td></tr></table></figure>\n<p>More info: <a href=\"https://hexo.io/docs/deployment.html\" target=\"_blank\" rel=\"noopener\">Deployment</a></p>\n"},{"title":"艰难困苦","lang":"zh","date":"2016-10-19T12:19:31.000Z","_content":"## 艰难困苦 欲汝于成\n自高中以来，在任何艰难困苦的时刻一直勉励自己的八字金言。没什么特别的内涵，但听着就像给自己打了几针鸡血一样，瞬间如金刚附体，刀枪不入，任何艰难险阻都能被踩在脚下。Yeah！\n\n最近回头想想，才发觉我可能是个正能量爆膨的人。随随便便喝下一碗汤，我就能唱出鸡肉的味道，然后坚信不疑告诉自己，真正make sense的不是那碗汤，而是喝汤的人。而我，仿佛就是这个能从狗屎里尝出人参味的人。\n\n不过运气好的是，我的坚持往往能换来我想要的结果，不论过程多么险阻，看上去都显得那么值得。这样的正反馈机制更让我深信不已自己的鸡汤哲学。并且像传教一样热衷于传播我的philosophy，由浅入深地洗脑别人，也洗脑自己。 \n\n只是...\n\n## 人生之事十有89都不顺\n鸡血打多了也会免疫，天天吃狗屎肯定会想吐。哪里还有鸡肉人参的味道。消化狗屎也需要能量啊。\n\n渐渐地，我也不乐于传授人参哲学了，要是真的觉得生活悲惨，像bullshit dogshit，那也先吃着吧，多喝几口水咽下去，什么也别说，不然别人闻着也能闻出shit的味道吧。\n\n没有太阳和温暖的日子，思念总是很容易蔓延，悲伤也是。听到首好听的歌也能哭出声来，吃了口热乎乎的面条怕自己心热得烫着。有时候憋着难受害怕自己憋出神经病来，但憋久了也不难受了。不是真的不难受。\n\n\n\n\n\n\n","source":"_posts/zh/kunku.md","raw":"---\ntitle: 艰难困苦\nlang: zh\ndate: 2016-10-19 14:19:31\ntags: \n- 乱七八糟\n- 中文\ncategories:\n- living\n---\n## 艰难困苦 欲汝于成\n自高中以来，在任何艰难困苦的时刻一直勉励自己的八字金言。没什么特别的内涵，但听着就像给自己打了几针鸡血一样，瞬间如金刚附体，刀枪不入，任何艰难险阻都能被踩在脚下。Yeah！\n\n最近回头想想，才发觉我可能是个正能量爆膨的人。随随便便喝下一碗汤，我就能唱出鸡肉的味道，然后坚信不疑告诉自己，真正make sense的不是那碗汤，而是喝汤的人。而我，仿佛就是这个能从狗屎里尝出人参味的人。\n\n不过运气好的是，我的坚持往往能换来我想要的结果，不论过程多么险阻，看上去都显得那么值得。这样的正反馈机制更让我深信不已自己的鸡汤哲学。并且像传教一样热衷于传播我的philosophy，由浅入深地洗脑别人，也洗脑自己。 \n\n只是...\n\n## 人生之事十有89都不顺\n鸡血打多了也会免疫，天天吃狗屎肯定会想吐。哪里还有鸡肉人参的味道。消化狗屎也需要能量啊。\n\n渐渐地，我也不乐于传授人参哲学了，要是真的觉得生活悲惨，像bullshit dogshit，那也先吃着吧，多喝几口水咽下去，什么也别说，不然别人闻着也能闻出shit的味道吧。\n\n没有太阳和温暖的日子，思念总是很容易蔓延，悲伤也是。听到首好听的歌也能哭出声来，吃了口热乎乎的面条怕自己心热得烫着。有时候憋着难受害怕自己憋出神经病来，但憋久了也不难受了。不是真的不难受。\n\n\n\n\n\n\n","slug":"kunku","published":1,"updated":"2019-05-11T11:04:24.287Z","comments":1,"layout":"post","photos":[],"link":"","_id":"cjvjhkgdw0019nb4tvxxp6l9s","content":"<h2 id=\"艰难困苦-欲汝于成\"><a href=\"#艰难困苦-欲汝于成\" class=\"headerlink\" title=\"艰难困苦 欲汝于成\"></a>艰难困苦 欲汝于成</h2><p>自高中以来，在任何艰难困苦的时刻一直勉励自己的八字金言。没什么特别的内涵，但听着就像给自己打了几针鸡血一样，瞬间如金刚附体，刀枪不入，任何艰难险阻都能被踩在脚下。Yeah！</p>\n<p>最近回头想想，才发觉我可能是个正能量爆膨的人。随随便便喝下一碗汤，我就能唱出鸡肉的味道，然后坚信不疑告诉自己，真正make sense的不是那碗汤，而是喝汤的人。而我，仿佛就是这个能从狗屎里尝出人参味的人。</p>\n<p>不过运气好的是，我的坚持往往能换来我想要的结果，不论过程多么险阻，看上去都显得那么值得。这样的正反馈机制更让我深信不已自己的鸡汤哲学。并且像传教一样热衷于传播我的philosophy，由浅入深地洗脑别人，也洗脑自己。 </p>\n<p>只是…</p>\n<h2 id=\"人生之事十有89都不顺\"><a href=\"#人生之事十有89都不顺\" class=\"headerlink\" title=\"人生之事十有89都不顺\"></a>人生之事十有89都不顺</h2><p>鸡血打多了也会免疫，天天吃狗屎肯定会想吐。哪里还有鸡肉人参的味道。消化狗屎也需要能量啊。</p>\n<p>渐渐地，我也不乐于传授人参哲学了，要是真的觉得生活悲惨，像bullshit dogshit，那也先吃着吧，多喝几口水咽下去，什么也别说，不然别人闻着也能闻出shit的味道吧。</p>\n<p>没有太阳和温暖的日子，思念总是很容易蔓延，悲伤也是。听到首好听的歌也能哭出声来，吃了口热乎乎的面条怕自己心热得烫着。有时候憋着难受害怕自己憋出神经病来，但憋久了也不难受了。不是真的不难受。</p>\n","site":{"data":{}},"excerpt":"","more":"<h2 id=\"艰难困苦-欲汝于成\"><a href=\"#艰难困苦-欲汝于成\" class=\"headerlink\" title=\"艰难困苦 欲汝于成\"></a>艰难困苦 欲汝于成</h2><p>自高中以来，在任何艰难困苦的时刻一直勉励自己的八字金言。没什么特别的内涵，但听着就像给自己打了几针鸡血一样，瞬间如金刚附体，刀枪不入，任何艰难险阻都能被踩在脚下。Yeah！</p>\n<p>最近回头想想，才发觉我可能是个正能量爆膨的人。随随便便喝下一碗汤，我就能唱出鸡肉的味道，然后坚信不疑告诉自己，真正make sense的不是那碗汤，而是喝汤的人。而我，仿佛就是这个能从狗屎里尝出人参味的人。</p>\n<p>不过运气好的是，我的坚持往往能换来我想要的结果，不论过程多么险阻，看上去都显得那么值得。这样的正反馈机制更让我深信不已自己的鸡汤哲学。并且像传教一样热衷于传播我的philosophy，由浅入深地洗脑别人，也洗脑自己。 </p>\n<p>只是…</p>\n<h2 id=\"人生之事十有89都不顺\"><a href=\"#人生之事十有89都不顺\" class=\"headerlink\" title=\"人生之事十有89都不顺\"></a>人生之事十有89都不顺</h2><p>鸡血打多了也会免疫，天天吃狗屎肯定会想吐。哪里还有鸡肉人参的味道。消化狗屎也需要能量啊。</p>\n<p>渐渐地，我也不乐于传授人参哲学了，要是真的觉得生活悲惨，像bullshit dogshit，那也先吃着吧，多喝几口水咽下去，什么也别说，不然别人闻着也能闻出shit的味道吧。</p>\n<p>没有太阳和温暖的日子，思念总是很容易蔓延，悲伤也是。听到首好听的歌也能哭出声来，吃了口热乎乎的面条怕自己心热得烫着。有时候憋着难受害怕自己憋出神经病来，但憋久了也不难受了。不是真的不难受。</p>\n"},{"title":"again","date":"2019-05-11T12:25:36.000Z","_content":"I just want to try again if this work.\nI know it's going to be hard.\nBut i will try.\nIf i can not make it, it's fine. I will have other way to make my blog.\n\nWanlu Lei","source":"_posts/en/again.md","raw":"---\ntitle: again\ndate: 2019-05-11 14:25:36\ntags:\ncategories:\n---\nI just want to try again if this work.\nI know it's going to be hard.\nBut i will try.\nIf i can not make it, it's fine. I will have other way to make my blog.\n\nWanlu Lei","slug":"again","published":1,"lang":"en","updated":"2019-05-11T12:27:30.671Z","comments":1,"layout":"post","photos":[],"link":"","_id":"cjvjhkgdx001anb4tp7k0l4h7","content":"<p>I just want to try again if this work.<br>I know it’s going to be hard.<br>But i will try.<br>If i can not make it, it’s fine. I will have other way to make my blog.</p>\n<p>Wanlu Lei</p>\n","site":{"data":{}},"excerpt":"","more":"<p>I just want to try again if this work.<br>I know it’s going to be hard.<br>But i will try.<br>If i can not make it, it’s fine. I will have other way to make my blog.</p>\n<p>Wanlu Lei</p>\n"}],"PostAsset":[{"_id":"source/_posts/Oscilloscope/realtime.jpg","slug":"realtime.jpg","post":"cjvjhkgdj0006nb4tp9zxmdvx","modified":0,"renderable":0},{"_id":"source/_posts/Hexo-learning/example.jpg","slug":"example.jpg","post":"cjvjhkgdf0002nb4tv16yq1j0","modified":0,"renderable":0},{"_id":"source/_posts/Hexo-learning/image_ex.jpg","slug":"image_ex.jpg","post":"cjvjhkgdf0002nb4tv16yq1j0","modified":0,"renderable":0},{"_id":"source/_posts/SFP-Module/copper_cable.jpg","slug":"copper_cable.jpg","post":"cjvjhkgdk0007nb4tvgwqk7kn","modified":0,"renderable":0},{"_id":"source/_posts/SFP-Module/jitter.png","slug":"jitter.png","post":"cjvjhkgdk0007nb4tvgwqk7kn","modified":0,"renderable":0},{"_id":"source/_posts/SFP-Module/sfpdesign.png","slug":"sfpdesign.png","post":"cjvjhkgdk0007nb4tvgwqk7kn","modified":0,"renderable":0}],"PostCategory":[{"post_id":"cjvjhkgdk0007nb4tvgwqk7kn","category_id":"cjvjhkgdh0004nb4tpvqfwly2","_id":"cjvjhkgdp000cnb4tmk0qel0c"},{"post_id":"cjvjhkgda0000nb4thn61tzgo","category_id":"cjvjhkgdh0004nb4tpvqfwly2","_id":"cjvjhkgdq000fnb4tna25pr6h"},{"post_id":"cjvjhkgdj0006nb4tp9zxmdvx","category_id":"cjvjhkgdh0004nb4tpvqfwly2","_id":"cjvjhkgdq000jnb4tv8deryx1"},{"post_id":"cjvjhkgdl0008nb4tcrny9nya","category_id":"cjvjhkgdq000gnb4tz1vm3scw","_id":"cjvjhkgdr000onb4t6my579ky"},{"post_id":"cjvjhkgdf0002nb4tv16yq1j0","category_id":"cjvjhkgdh0004nb4tpvqfwly2","_id":"cjvjhkgds000rnb4tdq4eh4fv"},{"post_id":"cjvjhkgdf0002nb4tv16yq1j0","category_id":"cjvjhkgdq000knb4tne5dh1rm","_id":"cjvjhkgds000tnb4td5d5wj16"},{"post_id":"cjvjhkgdw0019nb4tvxxp6l9s","category_id":"cjvjhkgdq000gnb4tz1vm3scw","_id":"cjvjhkge0001cnb4tbb7uowgh"}],"PostTag":[{"post_id":"cjvjhkgda0000nb4thn61tzgo","tag_id":"cjvjhkgdi0005nb4t78w06xy0","_id":"cjvjhkgdq000inb4tg4hwh08n"},{"post_id":"cjvjhkgda0000nb4thn61tzgo","tag_id":"cjvjhkgdm000anb4twstuymnu","_id":"cjvjhkgdr000lnb4tj3kakqur"},{"post_id":"cjvjhkgda0000nb4thn61tzgo","tag_id":"cjvjhkgdp000enb4toz5tsatq","_id":"cjvjhkgdr000nnb4tnttkbh3h"},{"post_id":"cjvjhkgdf0002nb4tv16yq1j0","tag_id":"cjvjhkgdq000hnb4t3o85rtqr","_id":"cjvjhkgdr000pnb4tjbp3ukpy"},{"post_id":"cjvjhkgdj0006nb4tp9zxmdvx","tag_id":"cjvjhkgdr000mnb4tesijj6fw","_id":"cjvjhkgds000vnb4teve3y9bq"},{"post_id":"cjvjhkgdj0006nb4tp9zxmdvx","tag_id":"cjvjhkgdr000qnb4tywd3yv9o","_id":"cjvjhkgds000wnb4thfobusl6"},{"post_id":"cjvjhkgdj0006nb4tp9zxmdvx","tag_id":"cjvjhkgds000snb4tzu5cgqvr","_id":"cjvjhkgds000ynb4tyxi7ovuh"},{"post_id":"cjvjhkgdk0007nb4tvgwqk7kn","tag_id":"cjvjhkgds000unb4tquh8783q","_id":"cjvjhkgdt0012nb4tlnzriiyg"},{"post_id":"cjvjhkgdk0007nb4tvgwqk7kn","tag_id":"cjvjhkgds000xnb4t9t3kgv7e","_id":"cjvjhkgdt0013nb4thl6quf1c"},{"post_id":"cjvjhkgdk0007nb4tvgwqk7kn","tag_id":"cjvjhkgdt000znb4t4spjm08y","_id":"cjvjhkgdt0015nb4t0zbun84g"},{"post_id":"cjvjhkgdk0007nb4tvgwqk7kn","tag_id":"cjvjhkgdt0010nb4t28iw90h5","_id":"cjvjhkgdu0016nb4to553w9tc"},{"post_id":"cjvjhkgdl0008nb4tcrny9nya","tag_id":"cjvjhkgdt0011nb4ts5dekajt","_id":"cjvjhkgdu0017nb4tjpbo8gj2"},{"post_id":"cjvjhkgdl0008nb4tcrny9nya","tag_id":"cjvjhkgdt0014nb4t15cev2m6","_id":"cjvjhkgdu0018nb4tl6kikmeb"},{"post_id":"cjvjhkgdw0019nb4tvxxp6l9s","tag_id":"cjvjhkge0001bnb4tan2b39nj","_id":"cjvjhkge0001enb4tfa4a1gw6"},{"post_id":"cjvjhkgdw0019nb4tvxxp6l9s","tag_id":"cjvjhkge0001dnb4tdndfmb57","_id":"cjvjhkge0001fnb4t9p3mfkw6"}],"Tag":[{"name":"work","_id":"cjvjhkgdi0005nb4t78w06xy0"},{"name":"optical-power","_id":"cjvjhkgdm000anb4twstuymnu"},{"name":"rj45","_id":"cjvjhkgdp000enb4toz5tsatq"},{"name":"hexo","_id":"cjvjhkgdq000hnb4t3o85rtqr"},{"name":"oscilloscope","_id":"cjvjhkgdr000mnb4tesijj6fw"},{"name":"sampling osc","_id":"cjvjhkgdr000qnb4tywd3yv9o"},{"name":"realtime osc","_id":"cjvjhkgds000snb4tzu5cgqvr"},{"name":"SFP","_id":"cjvjhkgds000unb4tquh8783q"},{"name":"limiting, linear","_id":"cjvjhkgds000xnb4t9t3kgv7e"},{"name":"Direct Attach Cable","_id":"cjvjhkgdt000znb4t4spjm08y"},{"name":"jitter","_id":"cjvjhkgdt0010nb4t28iw90h5"},{"name":"nonsense","_id":"cjvjhkgdt0011nb4ts5dekajt"},{"name":"thinking","_id":"cjvjhkgdt0014nb4t15cev2m6"},{"name":"乱七八糟","_id":"cjvjhkge0001bnb4tan2b39nj"},{"name":"中文","_id":"cjvjhkge0001dnb4tdndfmb57"}]}}