Abstract
In this paper, the performance analysis of a coherent homodyne Optical Code Division Multiple Access (OCDMA) network has been presented based on the Binary Phase Shift Keying (BPSK) as a modulation scheme and Multi-Length Weighted Modified Prime Code (ML-WMPC) as a spreading code for multimedia applications. The Signal to Noise Ratio (SNR) and Bit Error Rate (BER) of this homodyne system has been proved as a function of the number of active users for different code lengths according to the provided media by the network such as audio, voice, and video. Besides, the Mach-Zehnder Interferometer (MZI) has been utilized as external phase modulator in homodyne detection. Furthermore, the receiver noise and Multiple Access Interference (MAI) are taken into consideration in the BER calculations. Finally, the results showed that the BPSK-OCDMA network can support more than 126 users from different media at the same time based on the use of ML-WMPC compared with 46 supported users in case of the existing Optical Orthogonal Code (OOC) is utilized.