Hi Steven,
Is this data taken over temperature, e.g. -40 to +85C module case temperature, or at room temperature only?
David Lewis
From: Swanson, Steven E [mailto:SwansonSE@xxxxxxxxxxx]
Sent: Monday, August 15, 2011 7:50 AM
To: STDS-802-3-MAINT@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_MAINT] Follow up on proposed Comment to add distance specification for 10GBASE-S over OM4 media
Matt etal,
I had our guys look at the VCSELs we have purchased on the open market used in our test facilities; there are 70 transceivers from 6 different manufacturers. 78% of the spectral widths are less than 0.35. The triple trade-off numbers are as follows:
1. The average spectral width is 0.286
2. The average wavelength is 849.4; worst case 845.7
3. The average OMA power is -1.24; worst case -2.42
Using these numbers in the IEEE model yields 5.2 dB of margin at 400m.
Using these numbers in the IEEE model yields 3.3 dB of margin at 550m.
The more I look at this, I think we are being REALLY, REALLY conservative in IEEE, maybe too much so; here is the distribution of spectral width:
Steven E. Swanson
Corning Incorporated
800 17th Street NW, HI/ES
Hickory, NC 28603-0489
t 828-901-5328
f 828-901-5533
c 607-725-1129
swansonse@xxxxxxxxxxx
From: Matt Traverso (mattrave) [mailto:mattrave@xxxxxxxxx]
Sent: Thursday, July 28, 2011 9:05 PM
To: STDS-802-3-MAINT@xxxxxxxxxxxxxxxxx
Subject: [802.3_MAINT] Follow up on proposed Comment to add distance specification for 10GBASE-S over OM4 media
Hello to the now very active IEEE Maintenance reflector!
As I mentioned during my presentation at the IEEE plenary in July I would like to schedule a few calls to follow up on the questions/comments raised during the meeting. (see http://www.ieee802.org/3/maint/public/traverso_1_0711.pdf)
My goal for these calls per the discussion on the floor is to try to build more confidence in the proposed reach value. I believe that there was broad consensus at the meeting that (a) goal of specifying value is worthwhile,(b) theoretical analysis was sound. I hope to confirm my perception at the first call & discuss further justification for 400m reach.
My intention is to submit a comment by the comment deadline of Aug 26th.
Call timing:
Wednesday Aug 10th, 10 – 11:30 am PT
Wednesday Aug 17th , 10 – 11:30 am PT
Meeting login details below
best regards
--matt traverso
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