Key starting type single soliton state optical micro comb generation method based on thin film lithium niobate

Abstract

The invention discloses a key starting type single soliton state optical micro comb generation method based on thin film lithium niobate. The relative detuning amount between the micro-ring resonant frequency and the pumping laser frequency is spontaneously started and changed by using the photorefractive effect of the lithium niobate crystal, and finally the relative detuning amount is locked in the survival area of the single soliton state optical micro comb. And meanwhile, the high-speed electro-optic phase modulation characteristic of the lithium niobate crystal is utilized, so that the determinacy generation of the single soliton state optical micro comb is ensured. The method is realized by connecting a frequency-fixed pump laser, an erbium-doped optical fiber amplifier, a polarization controller, a lens optical fiber, a thin-film lithium niobate chip, an optical spectrum analyzer, a photoelectric detector and an electrical spectrum analyzer. According to the method, the single soliton state optical micro comb is generated in a self-starting and deterministic manner by utilizing the low-power and fixed-frequency continuous laser source, a high-cost frequency sweeping light source, complicated starting operation, feedback control and the like which are necessary in a traditional method are not needed, and the method has important practical application value in many fields.

Description

technical field [0001] The invention relates to nonlinear optics, nonlinear frequency conversion, and generation of an optical frequency comb based on a microcavity, in particular to a method for generating a key-type single soliton optical microcomb based on thin-film lithium niobate. Background technique [0002] As a superior coherent broadband laser source and precise frequency scale, the generation and application of optical frequency comb has attracted the attention of many scientists and scientific research institutions in the past ten years. Among the various mechanisms and methods for generating optical frequency combs, Kerr optical frequency combs based on optical microcavities have many advantages such as compact structure, integration, low pump power, and wide spectral bandwidth, so they have become the focus of attention in the field of optical frequency combs in recent years. Research hotspots, especially since the existence of dissipative Kerr solitons was exp...

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Problems solved by technology

[0005] In addition, in the traditional frequency sweeping process, although the soliton state optical microcomb can be obtained, because the optical field in the cavity undergoes a chaotic state during the frequency sweeping process, the number of solitons in the final soliton microcomb is random

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