Design and simulation of CSRZ modulated 40 Gbps DWDM system in presence of Kerr Non linearity

Research in optical communications is being constantly driven by requirements for higher data rates and better spectral efficiency. On one hand, higher bit rates per channel involve the deployment of high-order modulation formats, which require increased signal-to-noise ratio and, hence, higher power per channel. On the other hand, higher spectral efficiency also demands closely spaced channels to optimize the operational bandwidth of optical amplifiers. The above requirements clearly point to a scenario of increased nonlinearity in the form of intra- and inter-channel crosstalk. Therefore, the mitigation or compensation of fiber impairments caused by Kerr nonlinearity becomes crucial. In this paper the performance of CSRZ modulation scheme is analyzed for WDM systems in the presence of Kerr Non linearity to estimate the effect of input optical power for various transmission distances under different dispersion compensation schemes and the performance is studied with the help of Q value and eye diagrams. This paper reports the superiority of CSRZ format over the conventional NRZ /RZ formats. The investigation is based on comprehensive simulative analysis.