Abstract
We present a novel coherent transceiver for optical differential phase-shift
keying/differential quadrature phase-shift keying (DPSK/DQPSK) signals based on
heterodyne detection and electrical delay interferometer. A simulation framework is
provided to predict a theoretical sensitivity level for the reported scheme. High
sensitivity of {45.18 dBm is achieved for 2.5-Gb/s return-to-zero (RZ)-DPSK signal,
and high sensitivities of {36.83 dBm (I tributary) and {35.90 dBm (Q tributary) are
observed for 2.5-GBaud/s RZ-DQPSK signal in back-to-back configuration. Transmission
for both signals over 100 km is also investigated. Experimental results are
discussed and analyzed.
© 2012 Chinese Optics Letters
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