LAUSR

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 0–10−7, CO-16-PSK is better technique as compared to other proposed techniques in terms of bit rate, Q factor and SNR.