Abstract

Long Haul optical links are realized by launching higher powers in to the optical fiber. As the launch powers\nincrease, the nonlinear effects become significant and affect the system performance. On the other hand, high capacity optical\nlinks are realized by transmitting several wavelengths simultaneously through the fiber. In this paper, simulation analysis of a\ndense wavelength division multiplexing system with 16 channels for a data rate of 10Gbps and 20Gbps is presented. The\nperformance of DWDM system has been compared for carrier-suppressed, duo binary and modified duo binary return-to-zero\nmodulation techniques. Pre, post, and symmetrical dispersion compensation techniques have been investigated to optimize\nthe system performance. From the simulation results, it is found that MDRZ scheme is optimum choice for a long distance\noptical link at high power. To mitigate the effects of nonlinearities the designed system is tested under perfect dispersion\ncompensation and also with some residual dispersion in the transmission link.