Improving The Performance Of DWDM Communication Systems Using Quadrature Amplitude Modulation DP-16QAM

Abstract

In this research, two DWDM communication systems were designed and implemented, the traditional one, and the one which is based on the Quadrature amplitude modulation DP-16QAM technology, and a comparison has been made between them, as the DP-16QAM modulation technique provides high spectral efficiency that is reflected by Directly on system capacity, enabling transmission at optical channel transmission rates of up to eight times the transmission rates of traditional DWDM optical channels.

The simulation was carried out in an Optisystem environment, and the results were tested and evaluated based on the achieved spectral efficiency and transmission rates, as well as the parameters Q-factor, BER, and OSNR.

The first DWDM system was designed with 32 channels Distributed in the spectral frequency range 193THz-193.775THz and each channel at a rate of 12.5Gb/s at a total rate of (400 Gb/s) and a spacing between channels of 25GHz, which gives a spectral efficiency of (0.5b/s/Hz) and the results were tested for a range of 160km.

The second DWDM system was designed with 32 channels Distributed in the spectral frequency range 193THz-193.775THz and each channel at a rate of 100Gb/s at a total rate of (3.2 Tb/s) and a spacing between channels of 25GHz, which gives a spectral efficiency of (4b/s/Hz) and the results were tested for a range of 160km.