Fourier domain mode-locked photoelectric oscillator

Abstract

The invention discloses a Fourier domain mode-locked photoelectric oscillator. The Fourier domain mode-locked photoelectric oscillator comprises a laser source, a phase modulator, a light notching filter, a photoelectric detector, a power amplifier and a power divider; the laser source, the phase modulator, the light notching filter and the photoelectric detector form a sweeping frequency microwave photon filter; a transmission band of the sweeping frequency microwave photon filter is decided by the difference of the laser source and the light notching filter notching location corresponding wavelength, the sweeping frequency of the microwave photon filter transmission band is realized through the sweeping frequency of the laser source or the light notching filter, and the change of the filter transmission band and the signal are matched with the in the time delay for transmitting a circle in a photoelectric oscillator loop; the Fourier domain mode-locking is realized, and the bandwidth-adjustable chirp microwave signal can be output.

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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