Optical frequency comb generation system and method with adjustable frequency interval based on microring resonator

Abstract

The invention relates to a micro-ring resonator-based system and method for generating an optical frequency comb with an adjustable frequency interval, and aims at solving the problems that an existing system for generating the optical frequency comb is poor in stability and the frequency interval of the optical frequency comb is fixed or is adjustable only within a few of free spectrum ranges. The system comprises a closed optical fiber ring cavity which is formed by connecting an optical amplifier, an optical isolator, a polarization controller, an upload / download micro-ring resonator, a beam splitter and an adjustable dual-wavelength filter through a single mode fiber in series; and the beam splitter is located behind the upload / download micro-ring resonator along the propagation path of a laser signal in the optical fiber ring cavity. By the system and the method provided by the invention, the optical frequency comb with the freely adjustable frequency interval can be generated; meanwhile, the self-terminating phenomenon of a traditional micro-ring resonator-based system is eliminated; the micro-ring resonator-based system and method have the advantages of being simple to operate and convenient to adjust; and the system is easy to integrate.

Description

technical field [0001] The present invention relates to an optical frequency comb generation system (device) and method, in particular to a Kerr optical frequency comb generation system (device) and method based on a nonlinear microring resonator, capable of generating optical frequency with adjustable frequency interval comb. Background technique [0002] An optical frequency comb is a discrete, equally spaced, comb-shaped spectrum. The optical frequency comb is like a "light ruler", which can be used to measure the optical frequency extremely precisely, making the time standard change from the microwave to the optical category, and its accuracy can be improved by more than four orders of magnitude. In addition, optical frequency combs have extremely important applications in precise optical metrology, optical communication systems, arbitrary optical waveform generators, optical atomic clocks, sensing systems, and photonic signal processing. [0003] Traditionally, optica...

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Problems solved by technology

In general, the frequency interval of the optical frequency comb of the microring resonator is consistent with the free spectral range of the resonator. The scheme has been reported, but its frequency interval adjustment range is only a few free spectral ranges, and its adjustment is relatively complicated and its stability is poor

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