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Re: [10GMMF] Task 4: Calculation of pulse delays within a mode group



Title: Message
Joerg,
this is a nice calculation. Even an axis symmetric profile but with two alpha exponent can break mode group degeneracy originating DMD within each mode group. this fits with our observation and with the conservation of mode group intensity versus polarization changes with offset launch.
Thank you,
 
beat regards
 
Stefano
-----Original Message-----
From: owner-stds-802-3-10gmmf@IEEE.ORG [mailto:owner-stds-802-3-10gmmf@IEEE.ORG] On Behalf Of Kropp Joerg (IFFO MOD CE)
Sent: Montag, 1. November 2004 14:22
To: STDS-802-3-10GMMF@listserv.ieee.org
Subject: [10GMMF] Task 4: Calculation of pulse delays within a mode group

Dear Colleagues,
on the last call we discussed the possible time delay within modes of a mode group in rotational symetric fibers.
Enclosed you will find an example which demonstrates that there exists various speeds within a mode group for fiber profiles which are not ideal.
The file shows the result of a calculation of a rotational symmetric fiber with 2 exponents of a1=1,97 and a2=2,05 with the alpha change at R=17Ám.
You can observe that there is no delay within a mode group for the low order modes which "see" the perfect profile, but there is calculated a large delay within a group for the mode groups 8 to 12 which travel in the area of the alpha change.
If the power distribution within a mode group changes due to the change of the launch condition it is possible to get a change in the pulse response of the fiber even in rotational symmetric fibers for this case.
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


 -----Original Message-----
From: owner-stds-802-3-10gmmf@IEEE.ORG [mailto:owner-stds-802-3-10gmmf@IEEE.ORG] On Behalf Of Yu Sun
Sent: Freitag, 29. Oktober 2004 22:40
To: STDS-802-3-10GMMF@listserv.ieee.org
Subject: [10GMMF] the minutes of task 4 call

Dear Colleagues,

 

Please find the minutes of task 4 group as the attached file. Any comments and suggestions are highly appreciated. The next task 4 meeting is scheduled as 11:00 am EST (please note the ending of day time saving), Nov 1st.

The dial in information is

 

# 1-888-296-6500

ID: 188249

 

Best regards,

 

Yu