Integrated optical polarization splitter based on photobleaching-induced birefringence in azo dye polymers
1999
An integrated optical polarization splitter has been
fabricated by utilizing the photobleaching-induced birefringence in an
azo dye polymer. It consists of a Y-branch waveguide
formed by the reactive ion etching with one of the two arms
photobleached. The refractive index of the photobleached arm is
decreased for the TE mode and increased for the TM mode. The
performance of the splitter was measured as a function of the energy of
the photobleaching beam and compared to a wave propagation simulation
of the device. The measured cross talks are less than -28 dB for
the TM mode and -24 dB for the TE mode at a wavelength of 1310
nm. The measured excess losses for the TE and TM modes, which
measure the effect of the Y branch and the photobleaching,
are 0.3 and 0.4 dB, respectively. The insertion loss was 5 dB,
which includes the input fiber to waveguide coupling loss.
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