METHOD AND APPARATUS FOR ULTRALOW PHASE NOISE MICROWAVE OSCILLATION USING FEMTOSECOND MODE-LOCKED LASER AND FLYWHEEL EFFECT OF PHASE-LOCKED LOOP

摘要

Suggested are a method and an apparatus for ultralow phase noise oscillation for lowering the phase noise of an electronic signal source. According to the embodiment, a laser beam pulse is generated by using a mode-locked laser using a nonlinear polarization rotation. A phase difference between an external voltage control oscillator and the generated laser beam pulse is detected. After that, the detected phase difference is feed-backed to the external voltage control oscillator. The phase noise of the external voltage control oscillator follows an optical pulse of ultralow phase noise. [Reference numerals] (110) Stretched pulse mode locking laser; (132) Phase modulator; (150) Loop filter