Performance analysis of Wave Length Division and Sub Carrier Multiplexing using different modulation techniques

In fiber-optic transmission system, transmission capacity and distance of optical signal are always an important consideration factor to improve the performance of the fiber-optic transmission system. The driving force motivating the use of multichannel optical systems is the enormous bandwidth available in optical fiber. A higher speed signals will be a combination of many lower-speed signals, since very few individual applications today utilize this high bandwidth. These lower-speed channels are multiplexed together in time to form a higher-speed channel. Several systems like Wavelength Division Multiplexing (WDM), Subcarrier Multiplexing (SCM) have been developed in order to increase the performance of transmission systems. In this project, we investigate the performance analysis of WDM and SCM methods. In WDM system, we have investigated the performance of the system using an 8 channel multiplexer. In SCM system, we have investigated the performance of the system using a 4 channel SCM system. The performance analysis of SCM employing OSSB modulation scheme using different modulation schemes like PSK, ASK and FSK have been analysed and performance comparison between these schemes has been done taking several parameters into consideration using optisystem software. Keywords-Subcarrier Multiplexing, Wavelength Division Multiplexing, Amplitude shift keying, Frequency shift keying, Phase shift keying