Design of Ultra High Capacity DWDM System with Different Modulation Formats

Multi-channel optical communication systems are realized using wavelength division multiplexing to meet the challenge of increasing bandwidth demand. Dense Wavelength Division Multiplexing (DWDM) technique makes full use of the huge fiber bandwidth and hence it is the ideal means of network expansion and the convenient way to introduce new broadband services. The DWDM system designed in this paper have 64 channels each 20 Gbps data rate are multiplexed with various channel spacing to realize 1.28 Tbps as total transmission capacity. In this paper various combinations of EDFA and Raman amplifiers (Hybrid configuration) where used for a dense wavelength division multiplexed system with MDRZ modulation formats and investigates transmission capacity of the Hybrid configuration in terms of quality factor, bit error rate. Moreover, the role of laser line-width is also investigated to minimize the non linearity and four wave mixing effect.