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With the rapid growth in the internet applications, pressure is observed on the optical communication systems. Free space optical communication (FSO) is very important alternative to the optical fiber because of elimination of licenses, trenching, and no cost of ways and saves the time of installation. Wavelength division is capacity enhancement multiplexing but due to large number of laser requirements, it becomes expensive. Mode division multiplexing (MDM) is suitable multiplexing technique because it needs only single laser and can support high data rates. Optical code division multiplexing and MDM is demonstrated in this work at 100 Gbps over FSO supporting 10 users. Multiple access interference is prominent issue in OCDMA codes and in order to suppress MAI, zero cross correlation codes are used and use of Laguerre Gaussian modes has been done. Different fog conditions are analyzed and two different OCDMA cods are incorporated as well as compared in the proposed system such as shift zero cross correlation codes and multi diagonal codes in terms of Q factor and BER. [ABSTRACT FROM AUTHOR]

With the increasing advent in digital age, it is required to set up an inter-satellite optical wireless communication (IsOWC) that can support ultra-high bit rate. Here the proposed IsOWC system is implemented using dense wavelength division multiplexing and sub carrier multiplexing. The proposed model is designed to work at three different wavelengths i.e. 850, 1064 and 1550 nm. The performance of the proposed models is measured in terms of Q-Factor and Bit error rate at a different transmitted optical power level and transmission bit rate. It is observed that by incorporating multiplexing techniques, higher transmission bit rates can be achieved. It is observed that maximum bit rate achieved by proposed IsOWC system employing multiplexing technique is multiple of the number of channels used in multiplexing i.e. four times the individual PSK modulated optical system. Finally, it is concluded that IsOWC system employing multiplexing techniques provides enhanced performance than single PSK modulated optical wave with existing optical infrastructure. [ABSTRACT FROM AUTHOR]