A multichannel Hermite Gaussian (HG) intensity profiles based inter-satellite optical wireless communication (IsOWC) using transmitter diversity

Mode division multiplexing (MDM) has emerged as a futuristic and potential technology for next-generation optical wireless networks. However, the inter-channel interference in multi-channel systems and the modes coupling in mode division multiplexed systems are the two predominant limitations and need to be addressed. Therefore, in this work, an inter-channel interference suppression technique based on the opting transmitter diversity (TD) technique is presented in 2λ × 2HG modes × 10 Gbps IsOWC system. For the realization of TD technique, two diverse arrangements such as Non return to zero (NRZ)-return to zero, and NRZ-alternate mark inversion (AMI) are proposed and also compared with non-TD arrangement such as NRZ–NRZ over 5000 km IsOWC distance. Hermite Gaussian (HG) modes like HG00 and HG01 are modulated with 850 nm and 850.8 nm each and provide 40 Gbps capacity. The proposed multichannel MDM-TD-IsOWC system is investigated for different IsOWC distances and pointing errors in terms of Log Bit error rate (BER) and compared with different reported studies. It is observed that IsOWC system provide improved performance by incorporating an N–A (NRZ-AMI) arrangement and offer maximum log BER for N–N (NRZ–NRZ) (non-TD) system.