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Re: [STDS-802-3-400G] IEEE P802.3bs 400 Gb/s Ethernet SMF Ad Hoc conference call draft agenda



On today’s SMF Ad Hoc conference call, during presentation of “Optical Specifications of SMF PMDs Study” it was suggested that the only time there is peaking in a PAM-4 waveform is when using the “Nyquist PAM-4” approach.

 

Peaking is a function of TX bandwidth and pulse shaping. If TX is driven by a DAC, then pulse shaping is limited by the DAC sampling rate and analog bandwidth. In the case of the 100G/wavelength proposals in .bs, even for “Broadband PAM-4”, the DAC imposes a severe limitation on pulse shaping, and in all cases there is non-negligible peaking.

 

A clear example of peaking can be seen in “Single Wavelength over 112Gb/s PAM4 …” by Way and Chan, despite the obvious design preference to have none.  

 

http://www.ieee802.org/3/bs/public/14_09/way_3bs_01a_0914.pdf#page=6 (see 3rd and 4th images)

 

This peaking is unavoidable because of the DAC and Driver limitations listed on the following pages.

 

A complete link budget has to account for reduction in TX OMA to manage the clipping level due to component limitations. It is not acceptable to ignore this penalty.

 

Chris

 

From: Anslow, Peter [mailto:panslow@xxxxxxxxx]
Sent: Tuesday, September 30, 2014 6:53 AM
To: STDS-802-3-400G@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-3-400G] IEEE P802.3bs 400 Gb/s Ethernet SMF Ad Hoc conference call draft agenda

 

Hi,

 

As previously announced, there is an SMF Ad Hoc meeting starting at 7:30 am Pacific Today, Tuesday 30 September.

I have currently received two requests for presentations so the draft agenda is:

 

Attendees names and affiliations will be taken from the Webex participants list. If you attend via phone only, or if your employer and affiliation are different, please send me an e-mail.

 

Discussion

·         IEEE patent policy reminder

o   http://www.ieee802.org/3/patent.html

·         Approval of the agenda

·         Approval of the draft minutes from 19 August 2014 call

 

·         Presentations

o   Updated Considerations on 400Gb/s Ethernet SMF PMDs             Peter Stassar, Huawei

o   Optical Specifications of SMF PMDs Study                                             Chris Cole, Finisar

 

Discussion

 

 

Peter Anslow from Ciena has invited you to join a meeting on the Web, using WebEx. Please join the meeting 5-10 minutes early so we may begin on time.

 

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Topic: "P802.3bs SMF Ad Hoc"

 

Date & Time: Tuesday, 30 September 2014 at 15:30, GMT Summer Time (London, GMT+01:00)

 

To join web meeting click here: https://ciena.webex.com/ciena/j.php?MTID=m6572f354a7a856a704aec5ef0fb5e0e2

 

Meeting password: IEEE (please note passwords are case sensitive)

 

Teleconference: Provide your phone number when you join the meeting to receive a call back. Alternatively, you can call:

4438636577  (United States)

2064450056  (Canada)

4006920013  (China)

 

Show global numbers: https://www.tcconline.com/offSite/OffSiteController.jpf?cc=2070125535

Conference Code: 207 012 5535

 

 

Meeting number: 689 183 943

 

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Additional Notes:

 

- To add this meeting to your calendar program click the following link, or copy the link and paste it into your Web browser: https://ciena.webex.com/ciena/j.php?MTID=m18ec485fd6625cb9308800f19f10c384

 

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https://ciena.webex.com

 

Pete Anslow | Senior Standards Advisor
43-51 Worship Street | London, EC2A 2DX, UK
Direct +44 2070 125535
|