Abstract

We report an analysis of the noise statistics for an optically preamplified differential phase-shift keying (DPSK) receiver with balanced and single-port detections. It is found that identical signal–amplified spontaneous emission beating noise exists for bits 1 and 0 in DPSK balanced detection. It is also revealed that the bit error ratio (BER) of a DPSK receiver with balanced detection has no direct relation to the conventional $Q$ factor. Moreover, an analytic BER expression for the DPSK balanced detection receiver is presented.

© 2004 Optical Society of America

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