Abstract
Free space optical (FSO) communication is a mode of optical communication, where the data transmission channel is established via free space, rather using conventional optical fibre in optical communications. The transmission uses the free space (e.g. air) as the medium, a low-power light amplification by stimulated emission of radiation (LASER) as a transmitter and a semiconductor as the receiver. As the channels in optical fibre communication (OFC) and FSO communication are different, the losses and noises are also different in both cases. The quality of optical signal transmission through wireless depends on the atmospheric characteristics, like rain, wind, snowfall, fog, temperature, sunlight, light from other sources and turbulence. The aim of this publication is to model the channel for the optical signals through the air by considering all the losses and noises over the medium. The noises in the receiver, e.g. shot noise and thermal noise, are also analysed with on–off keying and direct detection method and have shown the effects on the output electrical signal. Bit error rate (BER) versus distance is obtained considering the above noises and losses over the channel and at the receiver. Finally, a complete FSO system is simulated by combining both the channel losses and noises at receiver.
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Debnath, S., Bhowmik, B.B., Mukherjee, M. (2020). Free Space Optical Communication Channel Modelling with PIN Receiver. In: Elçi, A., Sa, P., Modi, C., Olague, G., Sahoo, M., Bakshi, S. (eds) Smart Computing Paradigms: New Progresses and Challenges. Advances in Intelligent Systems and Computing, vol 767. Springer, Singapore. https://doi.org/10.1007/978-981-13-9680-9_22
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