Abstract

This paper addresses the communications performance issues related to photonic beam forming and steering feed networks for phased-array antennas. A comprehensive analysis of critical communications performance parameters in an optical beam forming network (BFN) feeding a large multibeam, multicarrier phased-array antenna is presented. These communication parameters include the carrier-to-noise ratio, the composite-triple-beat noise due to intermodulation distortion and the spurious-free dynamic range of operation of the system. The results provide practical insight to various design trade-off and performance requirements for the optical components selected to meet the systems specifications. It is found that, under certain conditions, the relaxation induced noise in the laser could be more detrimental than the thermal and shot-noise terms. This finding should have considerable effect on the selection of photonic components and architectures for BFN systems. (Author)

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