Performance Evaluation Of Filtering For Wavelength Division Multiplexing Based Optical Fiber Networks

Abstract

The transmission distance of any WDM fiber-optic communication system is eventually limited by fiber losses and it was introduced from fiber attenuation, connectors, splices, dispersion, interference and bending causes the power reduction in optical fiber communication. This loss limitation was mostly overcome using tunable optical filters, devices in which the desired channel is to be selected at the receiver with negligible crosstalk and small insertion loss. In this thesis different kinds of tunable optical filters such as: Fabry-Perot, Machzehnder and Acuosto-Optic filters are implemented to compensate losses. From the obtained results, it will be shown that a WDM optical system with a Machzehnder filter gets the best performance to compensate losses than Fabry-Perot and acuosto-optic filters in terms of Q-factor, BER, eye height and threshold when a fiber length, attenuation coefficient and input power design parameters are changed. Also fabry-perot filter produced better results at all cases than acuosto-optic filter which has a bad performance than others. iii