JCS_V5_N1_RevP1 Prachi Agrawal Sharad Mohan Shrivastava Anuja Mishra Pooja Sharma Rahul Parganiha Journal on Communication Engineering and Systems 2277-5242 5 1 25 31 Wavelength Division Multiplexing (WDM), Cross Phase Modulation (XPM), Single Mode Fiber (SMF), Differential Quadrature Phase Shift Keying (DQPSK), On-Off Keying (OOK) In this review paper, the authors show a brief introduction about WDM system. Different types of nonlinearities found in optical fiber are taken into consideration among which, Cross Phase Modulation is focused. Also the Q-factor and BER at different values of the optical dispersion is analysed. Effect of Cross Phase Modulation on the optical fiber is presented by the graphs for the different values of Q-factor and BER. The intensity and timing jitter distortion caused by XPM in 100km NZDSF with channel spacing of 0.8nm is compared and effect of XPM in DQPSK modulation format is discussed. The modelling is done using a commercial optical system simulator named OptiSystem by Optiwave. The objective of this review paper is to make readers understand the key terms related to fiber nonlinearities specifically Cross Phase Modulation to help them carry out their future project work. November 2015 - January 2016 Copyright © 2016 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=4864