Bidyut,
The additional gain from operating at BER
10E-12 to 10E-3 in your example is the FEC optical gain. You cannot increase
the receiver sensitivity and add gain for FEC since this would be adding in the
same gain factor twice.
Regards,
Ryan Hirth
Director of ASIC Engineering
Teknovus Inc.
From: Bidyut Parruck
[mailto:Bidyut@CORTINA-SYSTEMS.COM]
Sent: Wednesday, August 29, 2007
1:31 PM
To:
STDS-802-3-10GEPON@listserv.ieee.org
Subject: [8023-10GEPON] PIN-PD
Power Budget
I have been looking at publicly available 10Gbps PON photodiode
datasheets from major suppliers. For the receiver sensitivity, they all claim
-21 dBm for BER of 1x10E-12. The typical characteristics curve suggests a BER
of 1x10E-3 for input power level of -25 dBm.
With input BER of 1x10E-3, we can find FEC algorithms which would
provide output BER of 1x10E-12 or better. Excuse my ignorance of the subject,
but why can't we use -24 dBm as the receiver sensitivity for PIN-PD receivers?
That will give us an additional 4 dB.
Here are some examples:
