EneFree Space Optical (FSO) communication offers a promising technology for future high speed networks by providing huge transmission bandwidth, light weight, small size, low cost, low power and license free deployment as compared to the present radio frequency systems. Since in FSO communication, the atmosphere is used as a channel, atmospheric turbulence effects cause fading and misalignment of signal at the receiver and deteriorate the Bit Error Rate (BER) performance. This paper is focused on analyzing the FSO communication system performance in Delhi by modeling FSO communication system using basic Wavelength Division Multiplexing (WDM) technique with optimizing several system parameters in different turbulent environments such as fog and rain. Performance is analyzed in terms of Signal-to-Noise Ratio (SNR), received optical power and BER for different meteorological effects at data rate of 2.5 Gbps, 5 Gbps and 15 Gbps. From the results, it is concluded that the quality of received signal can be improved with priority-based optimization of parameters that increases link range up to 115 km in clear weather condition at 15 Gbps.

Free Space Optical (FSO) communication is an optical wireless technology and can be mentioned as open-air photonics that utilizes light propagating in free space to transmit data between two points. FSO system offers the communication at the speed of light, so FSO is often named as “fiberless optics” or “optical wireless” transmission since it provides the speed of fiber cables with the flexibility of wireless communication (Carbonneau and Wisley, 1998). It is a line-of-sight communication technology that transmits a modulated narrow beam of light which carries the information through the atmospheric channel and subsequently received at the receiver. Therefore, this technology requires a clear line-of-sight between transmitter and receiver.

Telecommunications Journal, Bit Error Rate (BER), Free Space Optical (FSO) communication, Atmospheric turbulence, Link margin