Realization of 1Tbps FSO/OWC based inter satellite link using DP-QPSK for next generation LEO satellite internet system

Abstract

The world is witnessing significant development in the field of communication infrastructure to provide internet services across the globe. The limitations of optical fiber cable-based backbone networks in difficult geographical terrain have opened up a new opportunity for satellite-based internet service providers. Due to recent development in the field of Low Earth Orbit (LEO) space-based internet, it is important to have very high-speed Inter Satellite Links (ISLs). The proposed system is realized and simulated to achieve a very high data rate of 1Tbps for the distance up to 1500 km using Free Space Optics (FSO) or Optical Wireless Communication (OWC). It uses a Line of Sight (LOS) link setup and Dual Polarization Quadrature Phase Shift Keying (DP-QPSK) mechanism. The performance parameters are analysed in terms of Q- Factor, Bit Error Rate (BER), Constellation Diagram, Eye Diagram, etc. To compensate for the signal distortion and errors during propagation Universal DSP setup has been introduced at the receiving end. The coverage distance from 1000 to 1500 km is observed with 30dBm input power and 1550nm wavelength. The proposed system can be useful in the design of Inter Satellite Links (ISLs) for high-speed Low Earth Orbit (LEO) Space-Based Internet and it can replace the microwave backbone setup for the design of ISLs.