Mitigation of Scintillation Effect in Wave Division Multiplexed Free Space Optical Communication using Modified Multibeam Technique

Muhammad A., Tekanyi A. M. S., Sani S. M.

Abstract


Radio Frequency (RF) technology is licensed, bandwidth limited, expensive and congested due to surge in date rate demand. Finding an alternative technology led to the evolution of the Free Space Optical (FSO) communication. The FSO communication has the capability to overcome the challenges of RF technology but not without limitations. The atmosphere is the main channel for FSO communication and it suffers from atmospheric effects including Scintillation. This study mitigated the effect of scintillation in wave a division multiplexed Multi Input Multi Output (MIMO) FSO system. The input data was encoded using Binary Phase Shift   Keying   (BPSK)   and   modulated   with   Mack Zehnder modulator. The Modulated signal was sent through four independent FSO channels in order to improve link reliability and received power. The Equal Gain   Combination   (EGC)   technique   was   used   to combine the data at the receiver. The study achieved 8.35km increase in achievable link distance with acceptable quality factor of 5.9 compared to [4], a 52% increase in received power at a link distance of 4.5km and 50% reduction in BER compared to [4].


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References


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