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Re: [8023-10GEPON] PIN-PD Power Budget



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: