Re: [802.3_NGEPON] 答复: Re: [802.3_NGEPON] 答复: [802.3_NGEPON] Clarifying questions on guo_3ca_1_0716.pdf
Dear John,
Thank you for your question, in our test, we used a TO-can type 25G APD ROSA. I've updated my presentation with several backup slides for more information. Hope to be posted soon.
Best regards,
-----John Johnson <000007ff7d378f43-dmarc-request@xxxxxxxx> 撰写:-----
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收件人: STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx
发件人: John Johnson <000007ff7d378f43-dmarc-request@xxxxxxxx>
日期: 2016/07/22 下午08:27
主题: Re: [802.3_NGEPON] 答复: Re: [802.3_NGEPON] 答复: [802.3_NGEPON] Clarifying questions on guo_3ca_1_0716.pdf
=======================
Hi Yong,
I have one question: In your tests, is the quoted sensitivity for a ROSA
package or BOSA package (including losses of the diplexer and a wavelength
blocking filter)? If ROSA package, is this a TO-can or planar type
package? Thanks!
Regards,
John
John E. Johnson, Ph.D.
Manager, III-V Component R&D | Fiber Optics Products Division
Broadcom
office: 484.397.2368 | mobile: 908.329.5710
9999 Hamilton Blvd. | Breinigsville, PA 18031 USA
john.johnson@xxxxxxxxxxxx | broadcom.com
On Fri, Jul 22, 2016 at 4:28 AM, Yong Guo <guo.yong3@xxxxxxxxxx> wrote:
> Dear Liu,
>
> Thanks for your comments. Regarding as your concern for the sentence about
> easier sensitivity rather than output power, I may not use correct words to
> cause you confusion. What I mean is we have already proved the required
> sensitivity capability, so we probably don't need to put presure on
> transmitter side at this stage. But in case of 100G-EPON, more than 4dB
> power budget is required, then we can take further steps, such as improve
> launch power.
>
> BR,
> Yong
>
> *郭勇* Guo Yong *Ph.D*
>
> *技术预研高级系统工程师 * Senior Technology Preresearch System Engineer
> * FN产品团队* */* *有线产品经营部* FN Product Team / Wireline Product Operation
> Department
>
>
> *上海市张江高科技园碧波路889号中兴通讯*
> ZTE Corporation, 889 Bibo Rd, Zhangjiang Hi-Tech Park, Shanghai,
> P.R.China, 201203
> T: +86 21 68897116 M: +86 15618880912
> E: guo.yong3@xxxxxxxxxx
> *www.zte.com.cn* <http://www.zte.com.cn/>
>
>
>
>
> *Liudekun <liudekun@xxxxxxxxxx <liudekun@xxxxxxxxxx>>*
>
> 2016-07-22 16:15
> 请答复 给 Liudekun
>
> 收件人： STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx,
> 抄送：
> 主题： Re: [802.3_NGEPON] 答复: [802.3_NGEPON] Clarifying
> questions on guo_3ca_1_0716.pdf
>
>
> Dear Guo :
> Thanks for your information collection on 25Gb/s APD receiver sensitivity
> , I see there is another contribution lee_3ca_2_0716 from Lee do the same
> things in the meeting next week.
> They are very useful for us to evaluate different solutions and define the
> parameters for 25G systems.
>
> Just a different opinion on your following comments:
> “This is actually an issue that where you choose to put more pressure,
> transmitter side or receiver side. We think improving the sensitivity is
> much easier than increasing the transmitter power.”
>
> Usually, launch power is easier to improve compared with sensitivity
> improvement, due to :
> 1) The transmitter power from the laser chip is much easier to
> increase compared with APD chip sensitivity. For launch power, you can
> always increase the bias current to get more power until the limit of
> saturation or damage , if you can improve the damage power of a laser chip
> and also improve the heat dissipation with assembling, then you can get
> more launch power. While for APD sensitivity, you don’t have much
> measurement to improve the sensitivity except substantial technology
> improvement in chips fabrication.
>
> 2) The current coupling efficiency of the transmitter is generally
> low, 30%~40% coupling efficiency is quite typical. There is still much
> space for you to improve. If you can improve the coupling efficiency such
> as by more lens , or better package control, then you can improve it.
> While for a receiver , the coupling efficiency is very high already (more
> than 80%), there is no space(or very small) to improve.
>
> 3) There is usually a 4~5dB launch power spread range (such as from
> 4dBm ~ 9dBm for PR30 U1/U3, so large spread range), so you can get higher
> launch power just by “pick” (at some cost with yield loss). But for
> sensitivity , the sensitivity spread range is quite small, you don’t have
> any spacing to pick up.
>
> The present case is that, if you ask a vendor a transmitter with higher
> launch power, it’s usually doable but just with higher price. But if you
> ask a vendor a more sensitive receiver, the answer is usually “no” (not
> feasible in technical)
>
> On the issue “where you choose to put more pressure, transmitter side or
> receiver side”, I think a better answer is “the OLT side”, due to the
> OLT is less cost sensitive. That’s also a general principle in the past
> when we define the PON spec.
>
>
> But any way, look forward to see all of you and discuss the details next
> week in the meeting room.
> Best regards
> Dekun Liu
> ____________________________________________________
> Advanced Access Technologies Dept. 网络研究接入技术部
> Huawei Technologies Co., Ltd. 华为技术有限公司
> [image: Company_logo]
> Phone: +86 027-59267217 Email: *liudekun@xxxxxxxxxx*
> <linhuafeng@xxxxxxxxxx>
> 湖北武汉市关山一路光谷软件园A7-9 邮编：430074
> Huawei Technologies Co., Ltd.
> A7-9 Wuhan Optical Valley Software Park,Guan Shan Road,Wuhan,Hubei,
> P.R.China
>
>
>
> *From:* Yong Guo [mailto:guo.yong3@xxxxxxxxxx <guo.yong3@xxxxxxxxxx>]
> * Sent:* Friday, July 22, 2016 2:32 PM
> * To:* STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx
> * Subject:* [802.3_NGEPON] 答复: [802.3_NGEPON] Clarifying questions on
> guo_3ca_1_0716.pdf
>
> Dear Ed,
>
> Thank you very much for your comments,
>
> For your clarifying questions, following are my quick answers.
>
> 1. Yes, in the table of page 5, minimum of 6dB ER is indicated. However,
> AVPmin, OMAmin and sensitivity are all based on ER=9dB. I'm just keeping
> the same style with the Table 75-5 in 802.3. Please correct me if I'm wrong.
>
> 2. Some of these contributions are listed as follows, I will update them
> as back up slides before the meeting. The proposed downstream sensitivity
> is based on 9dB ER.
>
> cole_3ca_1_0316.pdf
> pan_3ca_1b_0516.pdf
> guo_3ca_1a_0516.pdf
> tanaka_3ca_1_0516.pdf
>
> 3. Yes, actually all of our lab results are better than -28dBm. We also
> had test from our 25G-PON prototype, results show better than -27dBm. We
> believe performance could be further improved in the future. However, in
> contrast, we don't think increasing minimum average power more than 3dBm
> for EML is feasible without using postamplifier. This is actually an issue
> that where you choose to put more pressure, transmitter side or receiver
> side. We think improving the sensitivity is much easier than increasing the
> transmitter power. Larger output power with amplifier can be used to
> compensate WM insertion loss.
>
> Thank you very much, and look forward to seeing you next week.
>
> BR,
> Yong
>
> *郭勇* Guo Yong *Ph.D*
>
> *技术预研高级系统工程师 * Senior Technology Preresearch System Engineer
> * FN产品团队* */* *有线产品经营部* FN Product Team / Wireline Product Operation
> Department
>
>
> *上海市张江高科技园碧波路889号中兴通讯*
> ZTE Corporation, 889 Bibo Rd, Zhangjiang Hi-Tech Park, Shanghai,
> P.R.China, 201203
> T: +86 21 68897116 M: +86 15618880912
> E: *guo.yong3@xxxxxxxxxx* <guo.yong3@xxxxxxxxxx>
> *www.zte.com.cn* <http://www.zte.com.cn/>
>
>
>
>
>
> *"Harstead, Ed (Nokia - US)" <**ed.harstead@xxxxxxxxx*
> <ed.harstead@xxxxxxxxx>*>*
>
> 2016-07-22 04:06
> 请答复 给 "Harstead, Ed (Nokia - US)"
>
> 收件人： *STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx*
> <STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx>,
> 抄送：
> 主题： [802.3_NGEPON] Clarifying questions on
> guo_3ca_1_0716.pdf
>
>
>
>
> Yong Guo,
>
> Thanks for your interesting contribution *guo_3ca_1_0716.pdf*
> <http://www.ieee802.org/3/ca/public/meeting_archive/2016/07/guo_3ca_1_0716.pdf>,
>
>
> I do have a few clarifying questions:
>
> On slide 5:
> 1. In the table ER=6 dB is indicated, while in the notes ER=9 is
> indicated. Could you please clarify? (I think you used 9 dB, and the 6 is
> a typo).
> 2. It is stated that “-27dBm sensitivity using 25G APD is feasible
> based on results from multiple contributions”. Could you please cite those
> contributions? Also, could you please confirm that this is for ER=9 dB.
> 3. Are these lab results, or do you consider -27 dBm would be a
> viable commercial value for our standard (i.e. high yield, over temperature
> and end-of-life).
>
> Thanks for your help.
> Ed
>
> Ed Harstead
> Lead Technologist
> Chief Technology Office, Fixed Networks, Nokia
> +1 718 309 3967
> *ed.harstead@xxxxxxxxx* <Ed.Harstead@xxxxxxxxxxxxxxxxxx>
>
>
>
>
> * From:* Glen Kramer [*mailto:000006d1020766de-dmarc-request@xxxxxxxx*
> <000006d1020766de-dmarc-request@xxxxxxxx>]
> * Sent:* Tuesday, July 19, 2016 3:02 PM
> * To:* *STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx*
> <STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx>
> * Subject:* [802.3_NGEPON] contributions for the July meeting
>
> Dear Colleagues,
>
>
> We have 33 contributions to be considered at the meeting next week.
> It will take me some time to create the html page with all the links. But
> the files are now available as a directory listing at the URL below, in
> case you want to start reviewing the presentations sooner.
>
> *http://www.ieee802.org/3/ca/public/meeting_archive/2016/07/*
> <http://www.ieee802.org/3/ca/public/meeting_archive/2016/07/>
>
> Also, if you have submitted a file and don't see it uploaded, please let
> me know ASAP.
>
> Regards,
> Glen
>
>
>