Evaluation of DWDM-FSO Environment Based on OFDM Modulation Technique

Abstract

Dense wavelength division multiplexing (DWDM) has emerged as a promising technique for meeting rising bandwidth demands in optical networks. It has been used to boost the capacity of long-distance optical transport systems like free space optics (FSO) and optical fibre. FSO communication is an optical communication technology that sends optical data wirelessly from one location to another. Q-Factor and the BER analyser are used to assess the signal strength of the received signal. DWDM over FSO communication system is very effective in providing high data rate transmission with a very low bit error rate (BER). The maximum reach of the proposed system is 100 km without any compensation scheme. By implementing the OFDM Modulation Technique, four channels of DWDM over a FSO communication system were successfully demonstrated and has been analysed for higher data rate and the better quality of BER. The 15 Gb/s data rate with channel spacing at 0.8 nm and input power of 15 dBm, covered the distance up to 100 km. To show the good performance of the proposed system, its BER, and Q factor are shown. A sharp increase in BER occurs if data rate and distance increase up to 21 Gb/s and 100 km. The simulations are carried out using OptiSystem version 17.0 commercial optical system simulator.