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Robert,
Thanks for the notes from the Ad-Hoc call.
I have comments on three sections:
“It was stated that for a 7% overhead code, such as RS, a 1.5 dB coding gain would be appropriate for PIN case, but a 3 dB gain for APD case. It was not known how to evaluate the pre-amplified PIN case. This seems to be a major area requiring clarification.“
Was this for RS (255, 239) as defined in G.709? Upstream or downstream? If it is for (255, 239) downstream I find this surprising are there measurements to support this?
Secondly,
“Assuming a value of 13 dBm for minimum Psat and subtracting 3 dB to avoid patterning and 2 dB for min/max range would yield a minimum SOA output power of 8 dBm as a working assumption. ”
I don’t think that there is any need to subtract anything for the min/max range. If +13 dBm is the guaranteed minimum Psat, then subtracting 3 dB to avoid distortion would give +10 dBm minimum. Surely a min/max range of 2 dB means that the spec for output power would be +10 dBm min and +12 dBm max?
Thirdly,
“It was not known how to evaluate the pre-amplified PIN case. This seems to be a major area requiring clarification.”
There is some information on the slope of the BER vs power curve for pre-amplified receivers in Supplement 39 to the G-Series Recommendations clause 9.5.2 which is relevant to the FEC gain that might be expected. This can be found at:
http://www.itu.int/rec/T-REC-G.Sup39/en
Regards,
Nortel Networks UK Limited, London Rd, Harlow, Essex CM17 9NA, UK
External +44 1279 402540 ESN 742 2540
Fax +44 1279 402543
_____________________________________________
From: Lingle, Jr, Robert (Robert) [mailto:rlingle@OFSOPTICS.COM]
Sent: 07 February 2007 22:40
To: STDS-802-3-10GEPON@LISTSERV.IEEE.ORG
Subject: Re: [8023-10GEPON] [POWER_BUDGET] ad hoc group 2nd meeting
Please find attached the notes from today's call.
Please review it carefully and discuss issues on the reflector. If you wish to volunteer to take action items, please let me know. Otherwise I will raise issues on the reflector and begin asking people to take action items
:-)
Robert
-----Original Message-----
From: Lingle, Jr, Robert (Robert) [mailto:rlingle@OFSOPTICS.COM]
Sent: Tuesday, February 06, 2007 5:27 PM
To: STDS-802-3-10GEPON@listserv.ieee.org
Subject: Re: [8023-10GEPON] [POWER_BUDGET] ad hoc group 2nd meeting
Please find attached the file for the call today 2/6 at 7PM EST and 2/7 at 9AM.
-----Original Message-----
From: Lingle, Jr, Robert (Robert) [mailto:rlingle@OFSOPTICS.COM]
Sent: Friday, February 02, 2007 4:37 PM
To: STDS-802-3-10GEPON@listserv.ieee.org
Subject: Re: [8023-10GEPON] [POWER_BUDGET] ad hoc group 2nd meeting
Please find attached the notes for the first Power Budget Ad Hoc meeting.
Please direct any corrections to me.
Robert
-----Original Message-----
From: Lingle, Jr, Robert (Robert) [mailto:rlingle@OFSOPTICS.COM]
Sent: Thursday, February 01, 2007 3:09 PM
To: STDS-802-3-10GEPON@LISTSERV.IEEE.ORG
Subject: [8023-10GEPON] [POWER_BUDGET] ad hoc group 2nd meeting
All,
I will send the notes from this week's meeting tomorrow 2/2.
As discussed in the previous call, the next call(s) will occur on Tuesday Feb 6 at 7PM EST and Wednesday Feb 7 at 9AM EST.
Notes from this week's call as well as agenda for next week will be sent Friday.
Toll-free in US 866-263-8899
Outside US 816-249-6061
Conf. Code 7707985015
Robert
Robert Lingle, Jr.
Fiber Design and Transmission Simulation OFS Corporate R&D, Atlanta
404-886-3581 (cell)
770-798-5015 (office)