Utilization of MIMO concept for optical communication system under fog condition

Abstract

Free-space optical (FSO) communication is considered to be license free, high data rate, wide bandwidth and cost-effective. Multi-input Multi-output (MIMO) systems can be employed to reduce the attenuation by heavy fog and improve FSO channel capacity. In this paper, single-input single-output and multiâĂŞinput multi-output systems are examined to investigate the performance of these systems under heavy fog. A comparison is made in terms of received optical power, signal to noise ratio, and bit error rate (BER) using OptiSystem version 7.0. The signal reaches up to 1.7 km, 1.55 km, 1.5 km, and 1.4 km for 4Tx/4Rx, 3Tx/3Rx, 2Tx/2Rx, 1Tx/1Rx respectively. The results showed that the quality of received power is enhanced by using up to four beams.