Suppression of Four Wave Mixing Crosstalk Components — a Comparative Study Between Genetic Algorithm and Optical Orthogonal Codes

Abstract

Increase in the data rate of fiber optic communication systems limited due to the nonlinear effects like Self phase modulation(SPM), Cross phase modulation(XPM) and Four wave mixing(FWM). Many investigations are carried out to mitigate these effects. In multi channel systems. Four wave mixing (FWM) in optical fibers induces channel cross talk and possibly degrade system performance. An opticalorthogonal code is the family of(01) sequence with good auto and cross correlation properties. It has been found in the literature that the FWM crosstalk components can be suppressed by the unequal spacing of the multiplexed channels. This unequal and equal spacing of the channel and frequency allocation is done using optical orthogonal spreading codes and the results are compared with the channel allocation using the Genetic algorithm (GA) approach for the first lime to the best of author’s knowledge. The optical orthogonal code frequency allocation technique scheme is advantageous than the GA approach in terms of reduced optical bandwidth requirements and more number of channels with null FWM crosstalk points. The Entire simulation work in this paper is carried out using MATLAB7 and SIMULINK tool box.