STABILIZED MICROWAVE-FREQUENCY SOURCE

摘要

A microwave-frequency source at frequency f M comprises: a dual optical- frequency reference source, an electro-optic sideband generator, an optical bandpass filter, an optical detector, a reference oscillator, an electrical circuit, and a voltage-controlled oscillator (VCO). The sideband generator modulates dual optical reference signals at v 2 and v 1 to generate sideband signals at v 1 ±nf M and v 2 ±n 2 f M . The bandpass filter transmits sideband signals at v 1 +N 1 f M and v 2 -N 2 f M . The optical detector generates a beat note at (v 2 -N 2 f M )-(v 1 +N 1 f M )- The beat note and a reference oscillator signal are processed by the circuit to generate a loop- filtered error signal to input to the VCO. Output of the VCO at fM drives the sideband generator and forms the microwave-frequency output signal. The resultant frequency division results in reduced phase noise on the microwave- frequency signal.