Equalized Multiplexed IsOWC system using DP-QPSK modulation

Inter-satellite optical wireless communication (IsOWC) is a promising technology that can be used for high-speed data transfer between satellites in space. In this paper, using decision feedback equalizer (DFE) and Dual Polarization Quadrature Phase Shift Keying (DP-QPSK) modulation techniques an IsOWC system is proposed. It is a 16-channel multiplexed system. Optical systems perform better in terms of bandwidth, power and light weight comparing to radio frequency (RF) systems. For satellite systems, weight is also an important factor. Thus, IsOWC is becoming more popular in recent days. The proposed system uses 30 dBm input power at 1550 nm wavelength. The major limitations of the IsOWC systems are pointing error, bean divergence, back ground light etc. These limitations can be minimized by using advanced modulation, equalization, diversity, coding techniques etc. As the communication channel behavior is non-linear in nature, here DFE equalizer is used. The system performance is compared with equalization and without equalization techniques. It has been designed and analyzed using OptiSystem and MATLAB environment. The date rate used is 40 Gbps for high-speed communication applications. Bit error rate (BER), link distance, optical spectra, optical time domain reflectometer (OTDR) diagrams, and Q-factor are all used to analyze the system performance. Future 5G wireless communication applications will greatly benefit from the suggested approach.