Performance Analysis of Free Space Optical Communication Network with Different Modulation Techniques
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Abstract
Free space optics is one of the emerging technology of optical wireless communication which refers to propagation of light beams through atmosphere for broadband communication. It is a promising alternative solution for RF network, as it provides stable data transmission and highest data rates. However performance of this system could be prominently degraded due to various atmospheric conditions that may lead to increase in bit error rate and affect link sustainability. In order to increase its reliability for all weather conditions, data modulation scheme is employed so as to make the communication link feasible. This paper presents analysis of proposed FSO system with comparative study of different modulation techniques under weak turbulence at 1550 nm wavelength in terms of BER and Q factor so as to mitigate adverse effects and improve efficiency. The findings are based on which modulation format provides better means of communication among OOK, ASK, FSK, BPSK, DPSK, QPSK for different link ranges and attenuation. Finally the simulation results are obtained, analyzed and further discussed.
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