Performance Analysis of 32 × 10 Gb/s DWDM Optical System using YDFA for Different Channels Spacing

In this paper, 32 × 10Gb/s dense wavelength division multiplexing (DWDM) optical system using ytterbium doped fiber amplifier (YDFA) having 100GHz, 75GHz, 50GHz and 25GHz channel spacing with starting frequency 193.414THz has been investigated. The performance of the end channel (first) has been considered being the worst case scenario to analyze the system. The DWDM system is evaluated by varying the length for the optical fiber from 40160km. It has been found that as the channel spacing decreases the performance drastically degrades owing to four wave mixing (FWM) effect. The best results have been reported for the system at the 100GHz channel spacing where the maximum Q factor (23.35dB) and output power (-1.156dBm) is achieved at 40km fiber length. Further, it is found that the maximum repeater-less transmission distance of the system with 100GHz and 25GHz channel spacing is 160km and 60km corresponding to BER < 10.