Investigation of Free Space Optical Transmission System for Various Bands of Wavelength in Clear Weather Condition

Abstract

In this work regarding to optical communication arena, the free space optical (FSO) transmission system is analyzed for clear weather condition. The transmitter used is a continuous wave (CW) laser and the receiver used is PIN photodetector, which are investigated for various bands of wavelength with constant data rate of 6 Gbps and at various distances to measure the maximum quality factor and minimum bit error rate. The clear weather condition is indicated with the parameter attenuation which influences the FSO transmission system from source to destination. The attenuation measured in dB/km should be as minimum as possible for the successful transmission of signal between the source and the destination. It is investigated that on increasing the distance between optical sources to the destination the Q-factor of transmitted signal reduces and bit error rate increases gradually. The wavelengths from different optical bands also influence the FSO transmission system, which are discussed in this paper. The power (mW) of different wavelength is kept minimum so as to minimize the additional losses that may occur due to increased power of optical source. The FSO transmission system shows good result with minimum power in clear weather condition.KeywordsFree space optical (FSO) systemContinuous wave (CW) laserQuality (Q)-factorBit error rate (BER)