IEEE MICROWAVE AND GUIDED WAVE LETERS, VOL. 5. NO. IO. OCTOBER 1995 335

Abstract-An optoelectronic technique for synthesis of fre-quency-versatile electrical signals phase-locked to the optical clock is proposed. The key component is an integrated-optic modulator (IOM) operated in the nonlinear regime. With a pho-todetctor, the IOM functions as an optoelectronic subharmonic mixer for intermixing microwave signals that are subharmon-ics of the optical clock. As a first demonstration, phase-locked subharmonics and fractional harmonics of the optical clock at fo = 500 MHz, with frequency equal to f o / n or ( n l n) f o, where n = 2, 3, 4... and m l n = 2/5,2/3,4/3.3/2 and 513 etc., are generated and characterized. I