Optical frequency comb multi-section light wave splicing method of linear frequency sweeping light source with ultra-wide spectrum range

Abstract

The invention discloses an optical frequency comb multi-section light wave splicing method of a linear frequency sweeping light source with an ultra-wide spectrum range. The optical frequency comb multi-section light wave splicing method comprises the following steps: step 1, realizing multi-wavelength linear frequency sweeping through utilizing linear changes of light frequency along with time of multi-wavelength optical frequency comb light wave output from a single-sideband light modulator, so as to generate continuous light containing a multi-wavelength simultaneous linear frequency sweeping signal; step 2, adjusting a filter bandwidth of a continuous light signal through an electric control tunable filter, so as to enable a central frequency change speed to be the same as a frequency sweeping speed of frequency sweeping light wave; linearly changing the speed of a linear frequency sweeping speed gamma along with time until the central frequency reaches v1+(N-1)delta f and a central frequency initial value is equal to minimum frequency sweeping light frequency, so as to obtain linear frequency sweeping light wave with the ultra-wide spectrum range. Compared with the prior art, influences of laser relaxation vibration can be basically avoided, and the linear frequency sweeping speed with the extra-high speed can be realized; the frequency sweeping light source with high frequency sweeping linearity and high frequency precision is guaranteed.

Description

technical field [0001] The invention relates to the technical fields of laser radar, optical coherence tomography and spectral analysis, in particular to an optical frequency comb multi-segment light wave splicing scheme of an ultra-wide spectral range linear frequency sweep light source. Background technique [0002] In the laser radar (LiDAR) system, optical coherence tomography (OCT) imaging system and the new ultra-high resolution optical spectrum analyzer (OSA), a special light source or laser system is required, and the output frequency of the light source is required to change with A continuous light wave with constant intensity that changes linearly in time, and the wider the frequency range, the better, while maintaining extremely high linearity and frequency accuracy. [0003] In the LiDAR system, the pulse light source was first used. Due to the need to improve the distance resolution, people must continuously reduce the pulse width, which eventually leads to the ...

AI Technical Summary

Problems solved by technology

Therefore, this scheme can greatly improve the signal-to-noise ratio of the system; however, this scheme is still limited by the large AWG loss and the small number of switches in the optical switch array, which limits the number of linear frequency-sweeping light waves that can be seamlessly spliced, making it difficult to achieve Ultra-wide spectral range linear sweep source

Images