Fourier domain mode-locked photoelectric oscillator

Abstract

A Fourier domain mode-locked photoelectric oscillator comprises a laser controller, a tunable laser, a phase modulator, an optical notch filter, an optical fiber, a photoelectric detector, an electricamplifier and a power divider, wherein the tunable laser, the phase modulator, the optical notch filter and the photoelectric detector form a microwave photonic filter together, and the transmissionband of the microwave photonic filter is determined by the difference value of wavelengths corresponding to the notch positions of the tunable laser and the optical notch filter. According to the invention, the tunable laser, the phase modulator, the optical notch filter and the photoelectric detector form a quickly tuned microwave photon filter, the rapid tuning of the transmission band of the microwave photonic filter is realized through the rapid tuning of the laser, and the change of the transmission band of the filter is matched with the time delay of a signal transmitted for a circle ina photoelectric oscillator loop, so that the Fourier domain mode locking is realized, and a chirp microwave signal with an adjustable broadband 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 photoelectric oscillator. Background technique [0002] High-quality microwave signal sources can be realized using electronic methods or photonics-based microwave signal generation techniques. Among them, the electronic method has high precision, but its instantaneous bandwidth and phase noise characteristics are poor. In order to overcome the shortcomings of electronic methods, researchers have proposed a variety of microwave signal generation technologies based on photonics, 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 broadband and fast-tuned chirped microwave signal generation by adjusting the wavelength of the laser, and its bandwidth and chirp speed are significantly higher t...

AI Technical Summary

Problems solved by technology

However, during frequency tuning, the new oscillation frequency needs to re-oscillate from noise and reach a steady state, which greatly limits the speed of frequency tuning

On the other hand, since the new mode is reconstructed from the noise, the phase of this mode is discontinuous or irrelevant to the previous mode, which means that the phase noise of the microwave signal will increase significantly during the frequency tuning process

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