Analysis of the performance of Subcarrier Multiplexed transmission system employing OSSB modulation

In this paper, the performance of the subcarrier multiplexed (SCM) system employing binary phase shift keying (BPSK) modulation as microwave subcarrier modulation and Optical Single Sideband (OSSB) modulation was analyzed and investigated by simulation through the use of OptSim software. The BPSK modulation technique was used because of its ability to provide high spectral efficiency and simple demodulation. The OSSB modulation was preferred in this system due to its advantage of high bandwidth efficiency. The system performance was investigated by varying the performance parameters of the components used, such as data rate of the source, optical modulation index (OMI), subcarrier frequency, phase shift difference between branches of the dual-arm Mach-Zehnder (MZ) modulator, fiber length and phase of the local carrier at the demodulator. The performance of the system was optimized by making tradeoffs between these performance parameters.