Abstract
In this paper, we examine the performance of two different phase modulation
methods in coherent optical code-division multiple-access (OCDMA) systems.
As optical spreading sequences, a recently introduced prime code family hereby
referred to as double-padded modified prime code has been employed and analyzed.
The OCDMA system operates under synchronous homodyne dual-balanced detection
scheme. In this analysis, binary phase-shift keying format is deployed where
the phase is modulated by either a Mach–Zehnder interferometer external
phase-modulator or an injection-locking of distributed feedback laser diode's
driving current. The performances of the two phase-modulation techniques in
the presence of multiple-access interferences in a shot-noise limited regime
are studied. Phase limitations and reasonable consequence associated with
the limited phase excursion are also investigated.
© 2008 IEEE
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