Hi Ryan,
I’m not sure where the FEC numbers are baked in. Here’s
the slide 8 from 3av_0705_takizawa_1.pdf.
Bidyut
From: Ryan Hirth [mailto:ryan.hirth@TEKNOVUS.COM]
Sent: Wednesday, August 29, 2007 2:10 PM
To: STDS-802-3-10GEPON@listserv.ieee.org
Subject: Re: [8023-10GEPON] PIN-PD Power Budget
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:
