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Analysis of a FDMA-CDMA optical network using heterodyne detection and coded BPSK

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Abstract

We consider a very high capacity optical network, combining wavelength-division multiplexing and CDMA,1 along with heterodyne detection and error control coding. Users operating on the same frequency use pseudorandom signature sequences and binary PSK modulation. The receiver analyzed is an optical correlator (Mach-Zehnder optoelectrical modulator) followed by etalon filtering (to reject out-of-band optical signals) and heterodyne conversion to an IF, whereupon coherent detection of the coded BPSK signal is performed. Multiple users on the same frequency induce multiple-access noise, in addition to the usual shot-noise. An important practical issue is the laser phase noise (linewidth broadening), whose effect was earlier studied for a uncoded single-user system, and for single-user, convolutionally-coded applications.3

© 1992 Optical Society of America

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