<p>Inter-satellite optical wireless communication (IsOWC) system epitomizes a leading-edge technology for satellite communications, employing optical inter-satellite wireless links to realize connections between satellites in orbits. Due to the notable increase in secure communication, ultra-high capacity transmission at high-speed data transmission in future-based space missions, a mode division multiplexing based IsOWC system using modified zero cross-correlation optical code division multiple access technique is realized. Four orbital angular momentum (OAM) spatial modes at {[0,0], [0,1], [0,2], [0,3]} are used at 16 × 10Gbps data rate. The simulation results depict the maximum inter-satellite distance of 33,500&#xa0;km at bit error rate of 10^− 9. Additionally, OAM beams system propagating over a 30,000&#xa0;km distance and sustaining maximum lens reflectance of 45% offers optimum system performance. Compared to PIN PD, the high data rate of 16 × 20Gbps is attained by utilizing spatial avalanche photodiode. The system can offers high optical signal to noise ratio of 21.44dB, low noise figure of appox. 11dB and high system gain of appox. 85dB, at 16 × 25 Gbps propagation speed. Compared to existing studies, this work offers better performance for utilized over large-capacity and highly secure satellite communication.</p>