Abstract
Low-loss perfluorinated polymers with a controllable optical birefringence
were synthesized for the purpose of fabricating polarization-splitting waveguide
devices, which have become an essential part of polarization-multiplexed coherent
optical communications. The birefringent polymer was embedded on one branch
of the asymmetric Y-branch waveguide to produce polarization-dependent mode
evolution due to the effective birefringence. The device with a branch angle
of 1/300 rad and birefringence of 0.007 showed a crosstalk of ${-}25$ dB and an insertion loss of 1.5
dB from fiber to fiber. The polarization splitters based on adiabatic mode
evolution exhibited negligible wavelength dependence and large tolerance in
waveguide dimension.
© 2011 IEEE
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