[EFM] Single wavelength, single fibre PMD for P2P

[Thomas.Murphy@xxxxxxxxxxxx]

Hello All,

First off I apologise for a blanket bomb approach with sending out this e-mail but
I have my reasons, as will become clear below.

As most of you will know, I am currently co-ordinating the development
of a single fibre, single wavelength PMD proposal for P2P links.
During a recent discussion of this work, it became clear that a number of people
were unaware of what was happening or still unclear of some of the technical issues involved. Several questions arose
which had already been answered in the course of dedicated telephone conferences and
some new issues were also raised.

Of course this discussion is very good for the quality of the standard. However,
in the interest of progress and completion of a baseline proposal for March, it
is essential that people allay any concerns they may have in the interim and go
into the meeting feeling ready to make an informed decision. 

I would therefore ask people who have an opinion (or concern) in this direction
to speak up, raise the issues and avoid further surprises in St Louis.

Arising from the aforementioned discussions was the idea that a 2 wavelength
PMD may be an alternative approach. In order to facilitate comparison of the 
two ideas, a matrix was proposed which I have included here in a somewhat modified 
form. I divided the table into Today and Future, the former represent current laser sources (FP and DFB)
and the later assuming the use of VCSELs, be that at 1310, 1490 or 1550 nm. I dislike the 1-10
approach of comparing as this is too subjective, rather a binary 0 or 1 representing the better solution
for a particular criteria. In some cases there are no differences and both receive 0. The 'points'
are added and a comparison may be made.  NOTE, this will not be the basis of the decision, rather an aid
to objective comparison. I have included comments behind each issue cells detailing my evaluation.

So, speak up, play with the table, add issues if necessary, send it back to me,
get on the telephone conferences.

Best regards and looking forward to further progress.

Tom and the P2P group

 <<Comparison matrix for 1 and 2 wavelength PMDs.xls>>

Comparison matrix for 1 and 2 wavelength PMDs.xls