Jonathan,
presuming that MMCL is the native launch
from the TOSA directly into MMF, then the increase in PIE-D relative to
the SMCL case would be attributable to power that gets filtered out by
the SM cord. Into which mode groups this filtered power couples
is of key importance, since the modal delay difference relative to the
lowest order modes will increase with mode group number, leading to higher
PIE-D. So it becomes critical to quantify the native launch. While
a CPR measurement can be of some assistance, it can only tell us
how much power lies in higher modes, not which higher modes are excited.
So its utility is very limited, unless the CPR requirement is set
very low, meaning very little power is permitted to be filtered out by
a SM cord. But an encircled flux measurement could provide sufficient
information. Can you measure EF at 1300 nm?
In addition, the native launch would
need to be examined with the effects of offset connections near the transmitter.
With this effect included, it is likely that the performance of this
particular native launch will degrade to levels similar to those of the
MCP without offset connectors (green bars on slide 5).
Regards,
Paul Kolesar
SYSTIMAX® SOLUTIONS
1300 East Lookout Drive
Richardson, TX 75082
Phone: 972.792.3155
Fax: 972.792.3111
eMail: pkolesar@systimax.com
Lew Aronson <lew.aronson@FINISAR.COM> Sent by: owner-stds-802-3-10gmmf@IEEE.ORG
12/14/2004 05:08 PM
Please respond to
"IEEE P802.3aq 10GBASE-LRM" <stds-802-3-10gmmf@IEEE.ORG>
To
STDS-802-3-10GMMF@listserv.ieee.org
cc
Subject
Re: [10GMMF] Task 2 and 4 slides for
meeting Dec15th - OM3 fibre measurements
Jonathan,
What is multimode center launch exactly (MMCL)? Also, why do you
have a 2nd 7 um offset connector in the 50 MCP case?
It is shown after the main spool so I presume it does not have a large
effect, but what was the motivation?
Finally, did you ever test any of the OM3 with a 62-MCP (i.e larger offset
than 16 um).
Lew
Lew Aronson (lew.aronson@finisar.com)
Finisar Corporation
1308 Moffett Park Drive
Sunnyvale, CA 94089-1133
408-542-4215 (PH)
408-543-0083 (FAX)
-----Original Message-----
From: Jonathan King [mailto:jking@BIGBEARNETWORKS.COM]
Sent: Tuesday, December 14, 2004 2:22 PM
To: STDS-802-3-10GMMF@listserv.ieee.org
Subject: Re: [10GMMF] Task 2 and 4 slides for meeting Dec15th - OM3
fibre measurements
Here are some measurements of OM3 fibre PIE-D values for various launch
conditions, contribution for task 2 and 4 meeting on wednesday 15th Dec
04
best wishes