Re: [10GMMF] Task 2 and 4 slides for Dec15th - OM3 fibre measurements
Title: Message
Paul,
thanks
for having a close look to the launch conditions and the discussion of the
presented results.
In the
last months task groups discussed several results on different fibers with
the various deviations from the ideal profile. If you are looking for bad
behaving fibers you will find samples with deviations on all radial sections
of the core. Our "kink fiber" (I gave some presentations on it) behaves
badly just within the range of the current offset patchcord but is very good for
all other launches. Our "benchmark fiber" behaves badly for nearly all
radial launches instead of pure central launch. Agilent presented results of a
fiber which behaves badly in the center launch situation but is well suited for
offset launch. Beside this examples there are hundrets of fibers which will
behave well, but we focused (offcause) in the last months on the critical
examples in order to understand better all the fiber
issues.
The
allover result of all the examinations for me is that most of the (old) fibers
(OM1 and OM2 ) will work better with offset launch than with central launch
because of the central dip deviations (and because of the OFL selection
criterion which weights strongest the larger radius areas). For these fibers we
need to avoid the launch in the central region. Since the central defects are
similar for OM1 and OM2 fibers we should use the same spec for both and we
should keep it at 6µm for EFL <30%. The spec for the large
radii must be adjusted to the different fiber diameters of OM1 and
OM2.
The
center launch spec for the OM3 fibers seems to me to be very
usefull for the OM1/OM2 fibers with deviations at larger radii because
many of them will behave very good with center launch (because the OFL
bandwidth has to exceed the bandwidth spec and if there is a outer defect there
has to be a very good center area).
Regards
Joerg
Infineon Technologies Fiber Optics
GmbH
MOD
CE
Dr. Joerg-R.
Kropp
Senior Staff
Expert
Wernerwerkdamm
16
D-13629 Berlin /
Germany
Phone
-49-30-85400-4918
Fax -49-30-85400-4900
Mail
joerg.kropp@infineon.com
Joerg,
thanks for the
confirmation and clarification.
Regarding the EF at 30%, if the radial limit is a small as 6 um, then
singlemode launches offset by as little as 8 um would be allowed.
Launches in this range have been shown by John Ewen this week to produce
the largest PIE-D in OM1 fibers, with values about 0.7 dB higher than those
for 20 um offset launches. So a spec this loose seems considerably
sub-optimal.
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@ieee.org
12/17/2004 05:11 AM
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| Re: [10GMMF] Task 2 and 4 slides
for Dec15th - OM3 fibre measurements |
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Paul,
you are
correct! The Bandwidth diagram is scaled for a length of 300m of a 1300nm
transmission. It is just the bandwidth which results from the pulse forms over
the 300m length (large diagram on each slide). In addition to that bandwidth
dependence on the offset radius of the launch I included the calculated OFL
bandwidth of the fiber by a straight line in order to give some additional
information.
A statement to the EFD values:
I agree that the lower borders for OM1 and OM2 offset launch
should be adjusted to the same value in order to get no difference between
both, my favorite for that is < 30% for EFD at 6µm.
The reason of the definition of the center border
is to avoid to large power in the central region because of the possible dip
in the center of the fiber. Since this dip is in general of the same size for
OM1 and OM2 fibers it makes no sense to define different values for the EFD
borders in that area.
Joerg
-----Original Message-----
From:
owner-stds-802-3-10gmmf@ieee.org [mailto:owner-stds-802-3-10gmmf@ieee.org]
On Behalf Of Paul Kolesar
Sent: Freitag, 17. Dezember 2004
01:35
To: STDS-802-3-10GMMF@listserv.ieee.org
Subject: Re:
[10GMMF] Task 2 and 4 slides for Dec15th - OM3 fibre
measurements
Joerg,
I believe I've answered my
first question. The OFL line is the raw OFL BW at 1300 nm not normalized
to GHz-km, simply GHz. The value is 0.5GHz-km/0.3km = 1.67GHz.
Correct?
Paul
Paul Kolesar
<PKOLESAR@SYSTIMAX.COM>
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Subject
| Re: [10GMMF] Task 2 and 4 slides
for Dec15th - OM3 fibre measurements |
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Joerg,
In your and Stefano's
contribution to Task2/4 this week you provide bandwidth plots on the
right side of three slides showing the trend with offset. I have two
questions:
1. In
each of these there is a horizontal line at about 1.6 GHz-km that appears to
be labeled OFL. Is this the OFL BW at 850 nm?
2. The horizontal axis is labeled
"radius of launch (um)". This can be interpeted in two ways. Is it
the encircled flux radius at perhaps 86% level, or (more likely) the offset
radius of the launch?
Thanks in advance for the clarifications.
Paul Kolesar
"Joerg-R. Kropp"
<Joerg.Kropp@INFINEON.COM>
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Subject
| Re: [10GMMF] Task 2 and 4 slides
for Dec15th - OM3 fibre
measurements |
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Jonathan and
all,
please
find enclosed further simulations about the OM3 transmission and our proposal
based on that simulations.
I hope it will be possible to discuss that today.
I
have to cut the presentation into two because of the 100k limit.
Joerg-R.
Kropp
Infineon Technologies Fiber Optics
GmbH
MOD CE
Dr. Joerg-R.
Kropp
Senior Staff Expert
Wernerwerkdamm 16
D-13629 Berlin /
Germany
Phone -49-30-85400-4918
Fax -49-30-85400-4900
Mail joerg.kropp@infineon.com
[attachment "OM3 Fiber EFD PIED1.pdf" deleted by Paul
F Kolesar/CommScope]