Fourier domain mode-locked photoelectric oscillator based on stimulated Brillouin scattering loss spectrum

Abstract

The invention discloses a Fourier domain mode-locked photoelectric oscillator based on a stimulated Brillouin scattering loss spectrum. The Fourier domain mode-locked photoelectric oscillator comprises a tunable laser, a phase modulator, a high-nonlinearity optical fiber, a circulator, an optical band-pass filter, a photoelectric detector, an electric amplifier, a power divider and a pump laser, wherein the tunable laser, the phase modulator, the pump laser, the high-nonlinearity optical fiber, the optical band-pass filter and the photoelectric detector form a microwave photonic filter together, and the transmission band of the microwave photonic filter is determined by the wavelength difference between the light emitting wavelength of the tunable laser and the loss spectrum of the stimulated Brillouin scattering. According to the invention, the microwave photonic filter capable of being tuned rapidly is constructed by using the stimulated Brillouin scattering loss spectrum, by periodically tuning the transmission band of the microwave photonic filter and matching the change of the transmission band of the filter with the time delay of a signal transmitted for a circle in a photoelectric oscillator loop, the Fourier domain mode locking is realized, so that a broadband-adjustable fast swept-frequency microwave signal can be outputted.

Description

technical field [0001] The invention relates to the technical field of microwave photonics, in particular to a Fourier domain mode-locked optoelectronic oscillator based on stimulated Brillouin scattering loss spectrum. Background technique [0002] High-quality microwave signal sources can be implemented using electronic methods or photonics-based microwave signal generation techniques. Among them, the electronic method has high accuracy, but the instantaneous bandwidth and phase noise characteristics are poor. In order to overcome the shortcomings of electronic methods, researchers have proposed a variety of photonics-based microwave signal generation techniques, mainly including dual-wavelength laser heterodyne method, optical pulse shaping method and optoelectronic oscillator technology. Among them, the dual-wavelength laser heterodyne method can easily realize the generation of broadband and fast-tuning microwave signals by adjusting the wavelength of the laser, and it...

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