Performance Analysis of Unipolar Code in Different Phase Modulations of Coherent Optical CDMA

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.

• Type: Journal
• Year: 2008
• Where: ENGL
• Authors: Mohammad Massoud Karbassian, H. Ghafouri-Shira
• Keywords: ENGL 2008, Optical Direct-detection Code-division, Prime Code, Prime Code Family