Abstract

A simple explanation of the observed 3dB advantage of differential phase-shift keying (DPSK) balanced detection over the intensity-modulated directly detected (IM–DD) type detection that can be easily used for system engineering purposes is presented. A Gaussian approximation is used to describe the tails of the detected noisy random signals leading to an analytical explanation of the observed 3dB advantage of DPSK balanced detection over the IM–DD type detection.

© 2006 Optical Society of America

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