Design and Performance Investigation of Intersatellite Optical Wireless Communication System Employing Modulation Techniques

Abstract

This work is focused to carry out the investigation of coherent optical quadrature phase shift keying (CO-QPSK), coherent optical quadrature amplitude modulation (CO-QAM), CO-8-QAM, CO-8-PSK, CO-16-QAM and CO-16-PSK techniques on intersatellite optical wireless communication system using OptiSPICE and OptiSystem at 1550, 1064 and 850 nm. The maximum bit rate achieved for CO-QPSK and CO-QAM is 0.511 Tbps, CO-8-QAM and CO-8-PSK is 0.742 Tbps and CO-16-QAM and CO-16-PSK is 1 Tbps at maximum distance of 45,000 km. The performance of CO-16-PSK is better than other proposed techniques in terms of quality (Q) factor at 1550, 1064 and 850 nm wavelengths. There is 59.93, 27.95, 16.58, 7.26 and 4.26 % improvement in CO-16-PSK from CO-QPSK, CO-QAM, CO-8-QAM, CO-8-PSK and CO-16-QAM respectively in terms of signal to noise ratio (SNR) at 1550 nm wavelength. On comparing all the techniques, it is found that at acceptable bit error rate 0---10ź7, CO-16-PSK is better technique as compared to other proposed techniques in terms of bit rate, Q factor and SNR.