We report a new design of differential phase-shift keying (DPSK) receivers which utilize a single demodulator to receive
polarization division multiplexed signals. More than 20 dB extinction-ratio can be achieved by optimizing the phase
detuning with a polarization controller in the receiver. Experimental demonstrations using 20 Gb/s polarization
multiplexed DPSK signals and 215-1 pseudorandom binary sequence are conducted to show the performance of the
proposed receiver. After 60 km of optical fiber transmission, the receiver has less than 3 dB power penalty at bit-error
rate (BER) of 10-9.
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