2×40 Gbps WDM-PON long haul system using FBG and Dicode

In this work, the effects of reshaped specta of different schemes such as NRZ (Non return to zero), Dicode-NRZ and Duobinary on Wavelength division multiplexing have been analysed for two wavelength 1550 & 1551 nm with the system capacity of 80 Gbps. For a system with the capacity of 80 Gbps is achieved by wavelength division multiplexing of two 40 Gbps channels and fixed fiber length of 50 km/span. Dispersion is mitigated by fiber Bragg grating (FBG) with post compensation and nonlinear effects are reduced using Dicode. We evaluated the performance of three schemes in terms of bit error rate (BER) and Q factor. Numerical simulation results show that Dicode-NRZ provides better tolerance towards dispersion and nonlinearities compared to others and can transmit signal up to 2000 km.