Performance of FSO Communication in the Atmospheric Turbulence for Various Modulation Schemes

Performance of FSO Communication in the Atmospheric Turbulence for Various Modulation Schemes

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
  
© 2018 by IJETT Journal
Volume-55 Number-3
Year of Publication : 2018
Authors : Simran Kaur, Priyanka Bhardwaj
DOI :  10.14445/22315381/IJETT-V55P226

Citation 

Simran Kaur, Priyanka Bhardwaj "Performance of FSO Communication in the Atmospheric Turbulence for Various Modulation Schemes", International Journal of Engineering Trends and Technology (IJETT), V55(3),142-147 January 2018. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group

Abstract
With the growing population there has been a demand for highly efficient communication link owing to the rapid advancement of broadband wireless communications. Optical fibre had grown in the last few decades due to its low loss and high capacity. In the present communication era, Free Space Optical (FSO) communication has gained significant importance and is replacing radio communication owing to its unique features: large bandwidth, high data rate, license free spectrum, less power, low mass requirement and last but not the least easy and quick deploy ability. All these can be achieved by using FSO and because of this it has therefore become need of the hour. Due to this there has been tremendous advancement in the technical side and available components under free space laser communication. In spite of that, Turbulence manifests in the performance of FSO in the atmosphere due to increased Bit Error Rate(BER) leading to degradation in the link performance. It happens because a portion of the atmosphere always includes turbulence and multiple scattering effects. Now this paper provides detailed survey of FSO system, its advantages, disadvantages and different applications. The modulation techniques used in FSO like OOK, BPSK, DPSK etc. have also been listed along with advantages. It also provides a comprehensive analysis of the degradation in performance of FSO in atmosphere. Different channel models have also been listed along with atmospheric scintillation.

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Keywords
FSO, atmospheric turbulence, modulation techniques, lazers, los (line-of-sight), optical wireless, scintillation, Bit Error Rate (BER), OOK, BPSK, DPSK.