Re: [10GMMF] Measured 62MMF connector loss with various offsets
Joerg,
Thanks for the
experimental data. It is really nice to see that theory and experiment are
agreeing.
Paul,
You are right there
is quite a range of expected average loss for the 62MMF single mode offset
launch patch cords.
To illustrate this I
have attached a PDF with graphs of the average loss at the first 62 MMF
connector (which the MMF output of the OSL patch cord connects into) for OSL
patch cords with internal SM-to-MM offsets of 17, 20 and 23 um
offset. The experimental results seem to agree with the
theory for a patch cord having an internal offset of about 20
um.
Regards,
David
Joerg,
thanks
for the experimental validation. One explanation for the differences
between David's calculations and your measurements might be the tolerance on
the offset launch position within the offset launch patch cord. The spec
is 20 +/- 3 um for a 62 um fiber. I believe cords at the high end of
this range (i.e. 23 um offset) would tend produce a launch that causes higher
loss than cords at the lower end (i.e. 17 um offset).
David,
did you
model a nominal (i.e. 20 um) offset?
Regards,
Paul Kolesar
SYSTIMAX® SOLUTIONS
1300 East
Lookout Drive
Richardson, TX 75082
Phone: 972.792.3155
Fax:
972.792.3111
eMail:
pkolesar@systimax.com
|
| "Joerg-R. Kropp"
<Joerg.Kropp@INFINEON.COM>
Sent by: owner-stds-802-3-10gmmf@LISTSERV.IEEE.ORG
08/20/2004 10:47 AM
Please respond to "IEEE 802.3aq
10GBASE-LRM"
|
To:
STDS-802-3-10GMMF@LISTSERV.IEEE.ORG
cc:
(bcc: Paul F Kolesar/CommScope)
Subject:
[10GMMF] Measured 62MMF connector loss with various
offsets |
Dear
All,
Enclosed you will find the experimental verification of the
calculated connector loss for various fiber offsets.
I used standard offset
patchcord for 62,5µm fibers for fiber launch and measured the loss for several
offsets of the multimode fiber.
The calculation of David Cunningham for
this case fits well to the measured
values.
Regards
Joerg
-----Original
Message-----
From: owner-stds-802-3-10gmmf@listserv.ieee.org
[mailto:owner-stds-802-3-10gmmf@listserv.ieee.org] On Behalf Of David
Cunningham
Sent: Mittwoch, 18. August 2004 21:25
To:
STDS-802-3-10GMMF@listserv.ieee.org
Subject: [10GMMF] 62MMF connector loss
and draft test link config
Dear All,
As promised on todays
Fiber Channel Ad Hoc I attach a PDF file containing the following
information:
* My calculated graphs of connector loss versus offset for
overfilled launch, steady state launch and 23 um offset single mode
launch.
* The agreed draft of the worst-case test configuration for
channel time variation measurements with comments from our call to document
our reasoning behind the chosen
configuration.
Regards,
David
62MMFOSLConLoss.pdf