Performance Investigation of OTDM Link at 10*4 Gbps and Link Range of 348 km Using NRZ and RZ Schemes

Abstract

Abstract In Optical Time Division Multiplexing (OTDM)-based systems, several optical signals with low bit rate B share the same carrier frequency and are optically multiplexed to form a composite bit stream at the higher bit rate N*B, where N denotes the number of channels multiplexed. In this paper, the analysis and investigation of the performance of OTDM link are carried out with help of simulation. In this paper, OTDM link is designed based on four channels having data rate of each channel which is equal to 10 Gbps with the use of RZ and NRZ schemes being analyzed. The proposed optical link achieved maximum transmission distance of 348 km over single mode fiber. The system operated over a distance of 348 km with bit error rate of 1.39×10−31 and Q-value of 11.60 with RZ, and bit rate of 1.47×10−24 and Q-value of 10.13 with NRZ respectively. The results shows that the proposed link performance is better optimized using RZ modulation scheme in comparison to NRZ scheme. This simulation work is done in optisystem 7.0. Further in this proposed OTDM link the comparison of the link performance is also analyzed using different pulse shapes for RZ and NRZ. The results being presented in this paper are significantly taken at transmitted power of 0 dBm and 2 dBm.