Optical frequency comb generation method and device based on filtering effect

Abstract

The invention belongs to the technical field of optical frequency combs, and discloses an optical frequency comb generation method and device based on a filtering effect, and the method comprises the steps: enabling a first micro-ring resonant cavity to be coupled with a straight waveguide, introducing a second micro-ring resonant cavity to be coupled with the first micro-ring resonant cavity, and introducing a mode coupling effect, loss is introduced into the second micro-ring resonant cavity, so that local dispersion introduced due to a mode coupling effect is weakened or even disappears, the transmissivity at the coupling mode frequency is increased to a certain extent, which is equivalent to introduction of an optical filtering effect into a light field in the first micro-ring resonant cavity, and thus generation of a single soliton state of the micro-cavity optical frequency comb is promoted; and an optical frequency comb spectral line with a smoother envelope is obtained. The mode coupling effect is introduced on the basis of the coupling structure of the two micro-ring resonant cavities, local dispersion introduced by the mode coupling effect is weakened or even disappears by introducing loss to the second micro-ring resonant cavity, and a filtering effect is introduced, so that the optical frequency comb with smoother envelope is generated.

Description

technical field [0001] The invention belongs to the technical field of optical frequency combs, and more specifically relates to a method and device for generating optical frequency combs based on filtering effects. Background technique [0002] With the rapid development of the communication industry, people's demand for communication capacity has greatly increased, and optical interconnection is gradually replacing electrical interconnection, which is far from meeting the relevant needs of users. The optical frequency comb technology based on the Kerr micro-ring resonator can realize functions such as frequency-domain precise measurement, optical soliton transmission, and improvement of optical communication capacity, and the micro-ring resonator has a sufficiently small size, very low power consumption, and a very mature manufacturing process. Therefore, how to promote the generation of microcavity optical frequency combs has become a research hotspot in related fields. ...

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Problems solved by technology

[0007] Aiming at the defects of the prior art, the object of the present invention is to provide a method and device for generating an optical frequency comb based on the filtering effect, aiming at solving the influence of the optical frequency comb under the single soliton state generated in the prior art due to the change of local dispersion A certain distortion occurs in the region where the mode coupling occurs, which leads to the problem that the envelope of the optical frequency comb is not smooth

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