Re: [802.3_NGEPON] Draft of questionnaire on 25 Gb/s APD receiver sensitivity

[John Johnson <000007ff7d378f43-dmarc-request@xxxxxxxx>]

I would add the following requests:

1.  Specify the form factor used for the measurement (eg, Chip-on-Carrier, ROSA or BOSA) and whether there are any filters or demux in the optical path.  A laboratory measurement on CoC with perfect optical alignment will be significantly better than a real-world BOSA so we need to know how to normalize the results.

2.  To Ed's comment on the scaling of OMA, I suggest measuring at two or more ER settings for each source.  I suggest 6dB and 8dB for EML, and 4dB and 6dB for DML.  Per Marek's comment, once it's set up it's only a few more minutes of work.

Regards,

John

On Tue, Jul 26, 2016 at 1:45 PM, Marek Hajduczenia <marek.hajduczenia@xxxxxxxxx> wrote:

That’s kind of what I was thinking about – once someone creates the measurement setup, getting measurement with fiber in the path for TDP assessment would be trivial and would get us extra data.

 

Regards

Marek Hajduczenia, PhD, CCNP CSCO12874393

 

From: Harstead, Ed (Nokia - US) [mailto:ed.harstead@xxxxxxxxx]
Sent: Tuesday, July 26, 2016 4:44 PM
To: Marek Hajduczenia <marek.hajduczenia@xxxxxxxxx>; STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx
Subject: RE: [802.3_NGEPON] Draft of questionnaire on 25 Gb/s APD receiver sensitivity

 

Marek,

 

The idea is that we don’t want to mix up dispersion penalty with sensitivity.  Of course it wouldn’t hurt to, in addition to back-to-back, also do measurements with fiber.  That information could be used as input to help answer another question: quantification of TDP.

 

Ed

 

From: Marek Hajduczenia [mailto:marek.hajduczenia@xxxxxxxxx]
Sent: Tuesday, July 26, 2016 11:05 AM
To: STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_NGEPON] Draft of questionnaire on 25 Gb/s APD receiver sensitivity

 

I also had a question on whether back-to-back measurement only is sufficient to properly characterize the APD receiver sensitivity and give us all the information we need.

 

Regards

Marek Hajduczenia, PhD, CCNP CSCO12874393

 

From: frank effenberger [mailto:frank.effenberger@xxxxxxxxxx]
Sent: Tuesday, July 26, 2016 2:02 PM
To: STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_NGEPON] Draft of questionnaire on 25 Gb/s APD receiver sensitivity

 

Thanks for this draft – I think it is very close. 

 

Regarding the question on “margin”, while I may be asking for too much, it would really be great if we could ask for the standard deviation on the sensitivity.  Moreover, we should clarify that the “sensitivity” we ask for is the mean (or typical) value. 

 

If we could get mean and standard deviation, then we can properly account for spec difficulty vs. yield trade-off. 

 

As it is now, I think there is a potential confusion in that some people report their typical number, while others will report their maximum (worst) sensitivity.  And different people have different levels of pain tolerance.  For instance, some may be comfortable with a 1dB margin, while others  like 2~3 dB of margin. 

 

Thanks,

Frank E.

 

 

 

From: 이한협 [mailto:hanhyub@xxxxxxxxxx]
Sent: Tuesday, July 26, 2016 1:16 PM
To: STDS-802-3-NGEPON@xxxxxxxxxxxxxxxxx
Subject: [802.3_NGEPON] Draft of questionnaire on 25 Gb/s APD receiver sensitivity

 

Dear all,

 

Enclosed find a draft of questionnaire on 25 Gb/s APD receiver sensitivity. Ed, Yong and me summarized test conditions and questions. It could be discussed tomorrow meeting.

 

Best regards,

 

Han