Micro annular resonant cavity-based self-locking dual-optical-frequency comb generation system and method

Abstract

The invention discloses a micro annular resonant cavity-based self-locking dual-optical-frequency comb generation system and method, belongs to the field of an optical frequency comb generation system, and specifically relates to the micro annular resonant cavity-based dual-optical-frequency comb generation system and method. The system comprises an annular resonant cavity and a dual-optical-frequency comb separation system connected with the annular resonant cavity through polarization maintaining optical fibers; the annular resonant cavity comprises an optical amplifier, an optical isolator, a first polarization controller, a micro annular resonant cavity and an optical filter which are connected through the polarization maintaining optical fibers in the cavity; the dual-optical-frequency comb separation system comprises a polarization light beam splitter and a second polarization controller which are connected through the polarization maintaining optical fibers; and the micro annular resonant cavity is a nonlinear micro annular resonant cavity with four ports. By virtue of the asymmetry of the waveguide structure, the TE mode and the TM mode of the waveguide have different indexes of refraction; two modes can be excited at the same time to generate two sets of broadband optical frequency combs with different polarization directions and multiple frequencies; and by virtue of separation and polarization rotation of the cross-polarization dual-frequency comb, the homoclitic super-high multi-frequency broadband optical frequency comb can be obtained.

Description

technical field [0001] The present invention relates to an optical frequency comb generation system, in particular to a microring resonator-based dual optical frequency comb generation system and method, and more specifically to a self-locking microring resonator-based dual optical frequency comb generation system The system and method, and two optical frequency combs are generated in the same microring resonant cavity. Background technique [0002] An optical frequency comb is a discrete, equally spaced comb spectrum. The dual optical frequency comb is composed of two optical frequency combs with slightly different frequency intervals. It has important applications in the fields of atomic and molecular spectroscopy, measurement of arbitrary optical signal characteristics, distance measurement with nanometer precision, and microwave photonics. [0003] In the dual optical frequency comb spectrum measurement, an optical frequency comb with a repetition frequency of f is used...

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Problems solved by technology

[0006] In order to overcome the problems of complex structure, high cost and poor system stability of the existing dual-optical frequency comb generation system, and to meet the needs of high-repetition frequency dual-optical frequency combs in the fields of high-precision molecular spectrum analysis and microwave signal generation, the present invention provides A self-locking dual optical frequency comb generation system and method based on a microring resonator, the system utilizes the asymmetry of the waveguide structure, so that the TE mode and TM mode of the waveguide have different refractive indices, so that the microring resonator The two polarization modes have different free spectral ranges, and the two modes are excited simultaneously to generate two sets of broadband optical frequency combs with different polarization directions and repetition frequencies

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