Abstract
We propose a novel scheme that combines a polarization-beam splitter
(PBS) and a 90° hybrid into a single device to demodulate the dual-polarization
quadrature phase-shift keying (DP-QPSK) signal by introducing a photonic crystal
structure into a 4 × 4 multimode interference coupler. Since no separated PBS is utilized,
the demodulator has much smaller chip size compared with a conventional DP-QPSK
demodulator which contains two PBSs and two 90° hybrids. Simulation with 2-D
finite-difference time-domain method indicates that the demodulator can operate
very well for demodulating the DP-QPSK signal. The numerical simulation demonstrates
a common-mode rejection ratio larger than 20 dB and phase errors smaller than ±5° of
the device over the C-band wavelength
range.
© 2012 IEEE
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