Micro-annular waveguide optical device used for generating optical frequency comb

Abstract

The invention discloses a micro-annular waveguide optical device used for generating an optical frequency comb. The device comprises a straight waveguide and an annular resonant cavity which are coupled together, wherein the annular resonant cavity comprises n first parts with a first section width W1, n second parts with a second section width W2, and conical couplers used for connecting the first parts with the second parts, and the n first parts and the n second parts are alternately coupled to form the annular resonant cavity. By changing the section size of the waveguide, chromatic dispersion within a certain wavelength range can be controlled to vary between positive values and negative values alternately, so that the influences of chromatic dispersion on the four-wave mixing effect are counteracted and tend to be zero, and then the influences of chromatic dispersion on the optical frequency comb are counteracted; in this way, the influence of chromatic dispersion on the optical frequency comb is reduced, the power flatness of the optical frequency comb is improved, and the optical frequency comb with flat power can be obtained.

Description

technical field [0001] The invention belongs to the field of integrated photonics and nonlinear optics, in particular to a microring waveguide optical device for generating an optical frequency comb. Background technique [0002] A series of discrete, equidistant frequency comb-like spectra are called optical frequency combs, which are used in arbitrary wave generation of light, wavelength division multiplexing, precise measurement of physical quantities, microwave photonic filters, optical fiber sensing, and clocks. Synchronization with calibration, satellite navigation and other fields has great application prospects. [0003] Traditional optical frequency comb technology relies on mode-locked lasers, which require an octave frequency range, is expensive, and has relatively high requirements for the application environment. And the cavity length of the laser is usually long, which means that the spacing between the generated comb teeth is very narrow, usually less than 1G...

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Problems solved by technology

like figure 2 As shown, even when the width is 1.78 microns, the dispersion value at 1600nm wavelength tends to zero, but the dispersion value at other wavelengths is not zero, which still has an impact on the generation of optical frequency combs

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