Description: Frequency response of Multimode (MM) fibers
beyond the baseband is studied both theoretically and
experimentally. It is shown that in the absence of mode group
mixing there are relative flat passbands suitable for transmission
in such fibers if the number of mode groups propagating is not
too large. Such conditions are usually met for typical
contemporary graded index (GI) silica fibers. It is also proved
that the passbands width is related to the baseband width.
Moreover, the 1300 nm window is the most suitable for
transmission due to small chromatic dispersion and reduced
number of mode groups propagating.
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