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To
all-
today
I sent a presentation of our new measurements on polarization effects to Piers
for uploading to the server. (Kropp 3 1004.pdf)
We
performed detailed measurements on our "worstcase" benchmark fiber and an OM3
fiber. The overall conclusions are
1.
Polarization effects are very small in fibers with low profile
distortions
2.
Polarization effects are very small if the excited mode groups have same
velocity and no significant pulse proadening is observed.
3.
Polarization effects can occur if two or more mode groups with different
velocities are excited which results in a pulse broadening. Different
polarizations excite a different power splitting between the modes which
changes the pulse profile.
4.
Fiber manipulation influences the transmitted signal (by changing the
polarization state in the fiber) but seems not to influence the size of the
polarization effect significantly (e.g. fiber on a fiber spool compared to free
lying fiber)
We
can discuss the results in the telco at monday.
Joerg
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