Quantum Limited DPSK Receivers with Optical Mach-Zehnder Interferometer Demodulation
Xiupu Zhang, Guodong Zhang
Abstract
We present an analysis of quantum-limited DPSK receivers with optical Mach-Zehnder interferometer (MZI) demodulation. It is shown for the first time that the quantum limits for DPSK/MZI receivers with single-port and balanced detections exactly differ from 3-dB in receiver sensitivity, obtained by both Poisson and Gaussian noise statistics.
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