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Optical Fiber Telecommunications VA, 5th Edition
book

Optical Fiber Telecommunications VA, 5th Edition

by Ivan Kaminow, Alan E. Willner, Tingye Li
July 2010
Intermediate to advanced content levelIntermediate to advanced
944 pages
34h 12m
English
Academic Press
Content preview from Optical Fiber Telecommunications VA, 5th Edition
PDW shift zero or even negative (over compensation), we have found experimentally
that significant polarization crosstalk in directional couplers occurs despite clamping.
A more robust approach is to use 2 2 star couplers instead of directional
couplers (see Figure 9.5). This results in a perfectly symmetric environment for
each waveguide, thus eliminating the polarization crosstalk. A Mach–Zehnder delay
interferometer that uses star couplers to achieve low polarization crosstalk is
described in Ref. [12]. The drawback is increased insertion loss due to the ineffi-
ciency of a 2 2 star coupler, and if the star coupler is not carefully designed,
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Publisher Resources

ISBN: 9780123741714