Simulation On The Impact Of Cross-Phase Modulation (XPM) On WDM Optical Transmission System


Ezmir Mohd Razali, (2003) Simulation On The Impact Of Cross-Phase Modulation (XPM) On WDM Optical Transmission System. Masters thesis, Multimedia University.

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The innovation of Wavelenght Division Multiplexing (WDM) has provided the scalability necessary to cope with the capacity demands of data-driven communications. This technology fully utilizes the huge bandwidth potential offered by fiber by transmitting several wavelenghts or channels inside the same fiber. However, it causes a nonlinear interaction between the co-propagation pulses through a nonlinear phenomenon known as Cross-Phase Modulation (XPM). XPM proved to be a major limiting factor that causes high performance degradation especially for WDM system deploying Intensity Modulation with Direct Detection (IM DD) scheme. Current studies on XPM in WDM system are focusing on investigating the degree of output pulse distortion induced by XPM and did not evaluate the effect of XPM base on specific system performance parameters. The aim of this research is to propose an optimum design parameters and system configuration necessary in order to overcome and eliminate the effect of XPM in WDM IM DD transmission system. The effect of XPM is investigated by a computer simulation using OptSim 3.0-2, while Matlab and Fotran is used to model and simulate the optical fiber and performance parameters evaluation. The simulation is based on design parameter under consideration which are input power, channel spacing, number of channels, fiber dispersion, fiber lenght, channel bit rate and number of segments. For each design parameter, the level of XPM on WDM syatem is investigated based on the performance parameter under consideration which are BER, receiver sensitivity, Q-factor and eye penalty. From the simulation results, XPM in WDM IM DD system can effectively be reduced in three ways. First, power transmitted per channel is increased up to the acceptable Signal-to-Noise Ratio (SNR) level but without interfering with the neighbouring channel. Second, the channel spacing is increased up to the optimum value such that all channels are independent with each other. XPM can be reduced further by using a dispersion management configuration where a dispersion compensator is used to compensate dispersion effect in optical fiber. From the simulation results, distributed DC configuration is found to be the most effective configuration to reduce XPM.

Item Type: Thesis (Masters)
Subjects: L Education > LB Theory and practice of education > LB2300 Higher Education
Divisions: Faculty of Engineering (FOE)
Depositing User: Mr Shaharom Nizam Mohamed
Date Deposited: 03 Dec 2009 07:40
Last Modified: 04 Dec 2009 10:50


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