Phase-Modulations Analyses in Coherent Homodyne Optical CDMA Network Using a Novel Prime Code Family

This paper examines the Bit-Error Rate (BER) for an Optical direct-detection Code-Division Multiple-Access (OCDMA) system employing a novel prime code family, hereby referred to as 'Double-Padded Modified Prime Code (DPMPC)' for the spreading and de-spreading operations in addition to coherent homodyne dual-balanced detection. As a coherent modulation, Binary Phase-Shift Keying (BPSK) format is deployed where the phase is modulated by either an external phase-modulator or injection-locking methods. The phase limitation and the performance for both phase-modulations including Multiple Access Interferences (MAI) in a shot-noise limited regime are studied and moderate penalty associated with the limited phase excursion is revealed.