A multi-tone RoF system for three RF signals using external modulation with Erbium Doped Fiber Amplifier (EDFA) and Semiconductor Optical Amplifier (SOA) amplification techniques to generate the inter modulation products is designed. Then for inter-satellite communication we filter a particular inter modulation product according to the requirement (here we use 60 GHz) and use it as the carrier frequency for inter-satellite communication using Optical Wireless Channel (OWC). © Research India Publications.