Performance Analysis of 8 Channel DWDM Systems via Dispersion Compensation Fiber Using NRZ, RZ, CSRZ Modulation Schemes

Abstract

High data rates can be achieved using DWDM technology over optical fiber. Optical signals having different frequencies are modulated in DWDM system and then these signals are multiplexed into a single stream of light that is sent over optical fiber cable. Here, DWDM system performance is being compared under different modulation formats (NRZ, RZ, and CSRZ) and at different power levels. For the comparative study 8 data channels are taken through which signals are being transmitted. The various components that have been used here are EDFA, dispersion compensation fiber (DCF) of length 14 km along with single mode fiber (SMF) of length 86 km. System is operating at 10 Gbps with link length of 86 km at a wavelength of 1550 nm. The effective modulation format which will effectively increase the system performance without a change in previous design is presented. The system performance is evaluated on the basis of Quality factor (Q-factor) and Bit Error Rate (BER). The performance of system provides acceptable result with CSRZ modulation with much-reduced BER and increase in Quality Factor (Q-factor). DWDM system is designed and simulated on Optisytem software provided by Optiwave.