Capacity requirements increase day by day due to video calling, high speed online games, and high capacity systems etc. Wavelength and time division multiplexing are widely used but suffers from some limitations. Therefore, hybrid multiplexing is an important technique to overcome the limitations of existing wavelength division multiplexing and time division multiplexing. Hybrid multiplexing is a potential method to pack more number of channels in system and also suppress the interferences among adjacent channels. In this research work, 64 channels with ultra dense (50 GHz) channel spacing is demonstrated over inter-satellite optical wireless communication system and data is modulated with diverse modulations such as differential phase shift keying, Chirped and a line coding alternate mark inversion (AMI). Further comparison of modulations and coding is accomplished with proposed hybrid WDM-TDM-DPSK wireless optical communication system at different bit rates such as 10 Gbps, 20 Gbps and 40 Gbps. Variation in link length has been done from 500 km to 2500 km under lower earth orbit and results are taken as Q factor and BER. It is perceived that performance of proposed hybrid system is best among other investigated systems. System works successfully for 2500 km by employing hybrid WDM-TDM-DPSK over IsOWC system.
Nidhi Garg , Anju Tripathi "Comparison Of Different Modulations With Proposed Hybrid WDM-TDM Inter-satellite Optical Wireless System" Iconic Research And Engineering Journals Volume 2 Issue 10 2019 Page 118-126
Nidhi Garg , Anju Tripathi "Comparison Of Different Modulations With Proposed Hybrid WDM-TDM Inter-satellite Optical Wireless System" Iconic Research And Engineering Journals, 2(10)