Performance Analysis of Hybrid WDM-FSO System under Various Weather Conditions

Abstract

Free Space Optical (FSO) communication is being realized as an effective solution for future accessing networks, offering light passed through air. The performance of FSO system can be primarily degraded by various atmospheric attenuations such as rain, fog, haze and snow. At present, hybridization of Dense Wavelength Division Multiplexing (DWDM) with Coarse Wavelength Division Multiplexing (CWDM) becomes necessary to scale the speed and high bandwidth of the services. In this paper, primarily the attenuation values for different weather conditions are calculated. Then the hybrid WDM-FSO system is proposed, designed and the network parameters such as Bit Error Rate (BER), Quality factor (Q factor) and receiver sensitivity are analyzed with respect to link distance for various weather conditions. For investigation, four CWDM (1,510 nm, 1,530 nm, 1,570 nm and 1,570 nm) channel and eight DWDM channels (1,537.4 nm, 1,538.2 nm, 1,539 nm, 1,539.8 nm, 1,540.6 nm, 1,541.4 nm, 1,542.2 nm and 1,543 nm) are considered whose corresponding channel spacing is 20 nm and 0.8 nm, respectively. In addition, the Erbium Doped Fiber Amplifier (EDFA) is inserted at the receiver end in order to enhance the link distance. The proposed hybrid WDM-FSO system is designed to handle the quality of transmission for 12 users, each at a data rate of 2.5 Gbps along an FSO link distance of about 960 km.Keywords: free space optical communication, coarse wavelength division multiplexing, dense wavelength division multiplexing, atmospheric attenuations, bit error rate, link distance, erbium doped fiber amplifier, multibeam

Enhanced Performance of the 4 × 20 Gbit/s-40 GHz OFDM-Based RoFSO Transmission Link Incorporating WDM-MDM of Hermite Gaussian and Laguerre Gaussian Modes

“…The comparison of the system performance with conventional techniques reported in literature [26,28,[70][71][72][73][74][75][76][77][78][79][80][81].…”

A Review of immigration obstacles to PON-FTTH and its evolution around the world

“…There are various ways to combine wireless networks with fiber-based access.). It is a reference technology for multipoint deployment, providing a maximum throughput rate of 1.25 Gbit/s in the upstream direction and 2.5 Gbit /s in the downstream direction, shared by a maximum of 64 users (ITU, 2008b) [87]. And in south west Asia countries like UAE Has a 1.52 million FTTH/B subscribers.…”

Performance analysis of beam divergence propagation through rainwater and snow pack in free space optical communication

“… High bandwidth and low bit error rate compared to the RF were affected by electromagnetic interference, in addition it has a technology minimizes the topology of network parts [8]. FSO communication system has its own disadvantage which they are: -Because of the narrow beam divergence, it is hard to provide the requirement tracking and pointing of ATP (adenosine triphosphate) system and tight acquisition [9]. -FSO dependent on meteorological conditions which minimize the performance of the system and cannot be predictable [10].…”