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

You bring up the previous debate among the group. I generally agree with you to specify such parameters agressively. But what you are showing are typical data for OC-192 with high ER.
 
Also your 1E-3 starting BER rate may be too hash for gFEC. Just like Ryan point out, we typically budget fec gain separately. 
 
The group have some kind of agreement at about -18dBm for PIN, I think we can push this between -19 to -20dBm without much yield hit.  
-----Original Message-----
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: