Title :
Coherent optical CDMA with limited phase excursion
Author :
Ayadi, Fakher ; Rusch, Leslie A.
Author_Institution :
Commun. Res. Centre, Ottawa, Ont., Canada
Abstract :
We examine the bit error rate (BER) of the conventional matched-filter detector for an optical code division multiple access (CDMA) system employing coherent homodyne detection. We assume a phase shift keying (PSK) modulation format where the phase is modulated by one of two methods: (1) an external phase modulator or (2) injection locking. Phase excursion is limited to /spl plusmn/0.42 /spl pi/ when using injection locking. We examine the bit error rate performance for both external modulation and modulation of the injection current and find only a moderate penalty (0.55 dB) associated with the limited phase excursion.
Keywords :
Gaussian distribution; code division multiple access; coding errors; error statistics; filtering theory; light coherence; matched filters; modulators; optical communication; optical modulation; optical signal detection; phase shift keying; BER performance; Gaussian distribution; PSK modulation format; bit error rate; coherent homodyne detection; coherent optical CDMA; external phase modulator; injection current; injection locking; limited phase excursion; matched filter detector; multiple access interference; optical code division multiple access; phase shift keying; Bit error rate; Detectors; Injection-locked oscillators; Local oscillators; Multiaccess communication; Optical modulation; Optical receivers; Phase detection; Phase modulation; Phase shift keying;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/4234.552147
