Performance Evaluation of Inter Satellite Optical Wireless Communication Link at Multiple Optical Wavelengths Using Diverse Modulation Techniques

In this modern day optical wireless communication is the highly secured, convenient, fast and cost-effective communic ation system. Intersatellite optical wireless communication (ISO WC) is a unique modus operandi for the communication between satellites either they are in the same orbit or not using optical wireless communication as a medium. ISOWC as a system has some merits among are low power consumption, unlicensed Spectrum, huge bandwidth, high data rate, low-priced alternative to microwave satellite systems and immune to electromagnetic interference. In designing an efficient ISOWC link (ISOWCL), the choice of choosing an optical wavelength with an appropriate modulation formats that will enhance the performance the system become paramount. Previous studies have limited their work to two modulation formats and wavelengths. This cannot be used as a yard stick to for efficient design of an ISOWCL. In this research work, we evaluated the performance of ISOWCL considering multiple wavelength and diverse modulation formats. Bit error rate was used to evaluate the performance of the link. The result obtained showed that non-Return to zero performed better than all other modulation at all wavelengths while hyper secant had the worst performance. In all the wavelength considered, 1650 nm performed better than all other wavelength which is not mentioned in previous researches. The result will assist to develop an ISOWC link with good quality of service for inter-satellite.