Device for generating frequency-modulated laser signal based on phase modulator

Abstract

The invention discloses a frequency modulation laser signal generation device based on a phase modulator. The frequency modulation laser signal generation device comprises a laser light source, the phase modulator, a frequency modulation signal generator, a base frequency signal generator, a frequency mixer, a radio-frequency amplifier and an optical filter. According to the device, frequency mixing signals of frequency modulation signals generated by the frequency modulation signal generator and base frequency signals generated by the base frequency signal generator serve as driving signals of the phase modulator, the driving signals drive the phase modulator to generate frequency modulation laser signals, and the optical filter restrains harmonic waves to reserve frequency modulation laser signals of needed orders. According to the device, the frequency of the base frequency signals is controlled, frequency overlapping of various orders of frequency modulation laser signals can be avoided, high-order double-frequency signals can be acquired, and broadband adjustment is achieved. According to the device, filtering is achieved by the aid of the optical filter, and the obtained frequency modulation laser signals have a high sideband suppression ratio.

Description

technical field [0001] The invention relates to the technical field of frequency-modulated laser signals, in particular to a device for generating frequency-modulated laser signals based on a phase modulator Background technique [0002] Frequency-modulated laser sources have important application requirements in the fields of lidar, coherent optical communication, high-resolution spectroscopy, and optical generation of microwave signals. At present, the adjustment of the laser frequency is mainly achieved by directly controlling the laser cavity components to tune the wavelength range and using the modulator outside the cavity. Among them, the method of generating frequency-modulated laser signals based on an external modulator has the advantages of maintaining the linewidth characteristics of the laser light source and high modulation repetition frequency, and has become the first choice of scholars. [0003] The prior art [1] (Institute of Semiconductors, Chinese Academy...

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Problems solved by technology

[0004] The purpose of the present invention is to propose a FM laser signal generating device based on a phase modulator, which can solve the problems of laser line width, repetition frequency, sideband suppression and aliasing of generated FM signals

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