[8023-10GEPON] Jitter ad-hoc status

[Ryan Hirth <ryan.hirth@xxxxxxxxxxxx>]

Hi all,

First of all I’d like to thank Vijay for leading the ad-hoc meeting in Orlando.  I was select to lead the ad-hoc for our meeting in Tokyo since Vijay will not be able to attend.

 

The jitter ad-hoc met in Orlando and proposed jitter budgets for the upstream and downstream 10G-BasePR PHYs.  We left the meeting needing to verify the nominal jitter values selected.  The 10G jitter budget is very tight.  Please review the jitter table and study the feasibility of each test point.  

 

Orlando summary:

http://www.ieee802.org/3/av/public/2008_03/3av_0803_pathak_3.pdf

 

Jitter table:

10G-BasePR

TP1 24ps 0.25UI

TP2 34ps 0.35UI

TP3 53ps 0.55UI

TP4 68ps 0.70UI

TP5 24ps 0.25UI

TP6 39ps 0.40UI

TP7 48ps 0.50UI

TP8 68ps 0.70UI

 

 

1. For TP1 – Is serial output jitter feasible?

    OIF-CEI-02.0 11G-SR and XFPr4.5 Specifications are 0.3UI Tj.  Should this value be increased to comply with these specifications?

 

2. For TP1->TP2 – Is jitter added by an EML feasible?

    Can optical experts confirm this? (10ps,0.1UI)

 

3. For TP2->TP3 – Is jitter due to chromatic dispersion correct?

 

4. For TP3->TP4 – Is jitter due to PIN/APD, Limiting AMP, AC coupling, and cross talk feasible?

 

5. For TP4 – Is receive jitter tolerance feasible?  Is their margin for sinusoidal jitter test?

  OIF-CEI-02.0 11G-SR agrees 0.7UI Tj.  XFPr4.5 requires 0.65UI.

 

6. For TP5 – Is serial output jitter feasible with loop-timing?

    OIF-CEI-02.0 11G-SR and XFPr4.5 Specifications are 0.3UI Tj.  Should this value be increased to comply with these specifications?

 

7. For TP5->TP6 – Is jitter from DML Laser feasible?

    Can optical experts confirm this? (15ps,0.15UI)

 

8. For TP6->TP7 – Is jitter due to chromatic dispersion correct?

 

9. For TP7-TP8 – Is jitter due to burst-mode PIN/SPD, LA, AC coupling, and cross talk feasible?

 

10.For TP8 – Is jitter tolerance capable of burst synchronization?

  OIF-CEI-02.0 11G-SR agrees with 0.7UI Tj.  XFPr4.5 requires 0.65UI.  These values are not intended for burst mode operation.

 

 

Other issues:

 

1. Haim is to send out the jitter spreadsheet used by the jitter ad-hoc in the Orlando meeting. (Haim)
2. Should the sinusoidal jitter corner frequency be at 5Mhz? (Haim)
3. Is the jitter transfer curve feasible? (Ryan)

 

 

Please provide feedback promptly so that we can be prepared for the April meeting.  Feedback is open for anyone and is not limited to the members of the Orlando group.  Please let me know if there any other issues that should be added to the jitter ad-hoc list of issues.  I will prepare a summary of the feedback I receive by April 11 to report at the Tokyo meeting.

 

Thank you,

 

Ryan Hirth

Teknovus Inc.