Spacing-adjustable soliton optical frequency comb system based on micro nano resonant cavity and adjusting method thereof

Abstract

The invention provides a spacing-adjustable soliton optical frequency comb system based on a micro nano resonant cavity and an adjusting method thereof. The adjusting method comprises three steps of amplifying an after-filtering pumping micro nano resonant cavity by means of a single light source, finding out a wavelength range of the pumping light which can be coupled and enter the micro nano resonant cavity, and determining wavelength range of a corresponding bistable area which is generated by solitons; generating an optical frequency comb by a single-light-source pumping resonance cavity of which the wavelength is a corresponding value when an in-chamber power which is recorded in the first step begins to increase; and finally adjusting the wavelength of the single-light-source in the second step to the wavelength which corresponds with a bistable area, simultaneously adding another light source of which the wavelength is lower than N-time FSR of the light source, coupling the two light sources in the resonant cavity, and obtaining the soliton optical frequency comb through gradual evolution. When the frequency interval of the pumping light source is N-time FSR, the spectral line interval of the soliton optical frequency comb is N-time FSR correspondingly. The distance-adjustable soliton optical frequency comb system can generate the soliton optical frequency comb with adjustable spectral line spacing and realizes no consideration for pumping light wavelength adjusting rate.

Description

Technical field [0001] The present invention relates to the technical field of optical frequency combs, in particular to a soliton optical frequency comb system with adjustable spacing based on a micro-nano resonant cavity and an adjustment method. Background technique [0002] Optical frequency comb refers to a series of precise and equally spaced discrete spectra with extremely narrow line widths in the frequency domain, and a series of equally spaced ultrashort optical pulse sequences in the time domain, which are mainly used in millimeter wave / terahertz communication, precision Optical frequency measurement, spectral calibration, absolute distance measurement, radio frequency photonics and other fields, is the generation of high-frequency low-phase noise signal source, high-speed optical communication light source generation, optical arbitrary waveform generator, basic physical constant measurement, terrestrial planet detection, Indispensable tools for dark matter and dark en...

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Problems solved by technology

The existence of the four-wave mixing coupling term makes the numerical calculation time of the equation proportional to the cube of the number of microcavity modes. Therefore, when simulating the evolution of hundreds or thousands of modes, the description method of the nonlinear coupled mode model is extremely Inefficient

[0007] However: the above-mentioned patent only proposes the generation scheme of the pitch-adjustable optical frequency comb, which cannot be applied to fields requiring higher stability of the optical frequency comb

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