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True Time Delay Scheme for Continuous Optical Control of Phased Array Antennas Employing Chirped Fiber Gratings

A novel approach of true-time delay (TTD) feeder for optically controlled phased-array antennas (PAA) is proposed and demonstrated. A continuously variable TTD is achieved by employing tunable lasers and a wide bandwidth chirped fiber grating (CFG) as dispersive element. A high resolution performance (5.3 ps) is obtained for a 2-6 GHz PAA employing narrow tuning-bandwidth lasers with a wavelength stability of 0.005 nm and a 4 nm bandwidth CFG.