Optical waveguides ring-shaped resonant cavity elementary structure parameter test device and its method

Abstract

The invention discloses a testing device and method for basic structural parameters of an optical waveguide ring resonant cavity. Three reference straight waveguides with the same structure are designed on the optical waveguide ring resonator chip, and after being coupled by a fiber coupler, by testing the resonance curve of the ring cavity and the average output amplitude of the reference straight waveguide, all the structural parameters of the optical waveguide ring resonator are obtained. Specific values, including coupler coupling coefficient and additional loss, and waveguide transmission loss. The device for obtaining the structural parameters of the optical waveguide ring resonant cavity: the sawtooth wave signal generator is sequentially connected with the laser, the optical waveguide ring resonant cavity chip, the PD detector, the oscilloscope, and the computer. The invention can obtain the three basic structural parameters of the optical waveguide ring resonant cavity in a non-destructive, simple and direct manner, and provide guidance for further optimizing the design of the high-performance optical waveguide ring cavity, and at the same time, it can improve the limit sensitivity and performance of the resonant micro-optical gyroscope It has important scientific significance and application value.

Description

technical field [0001] The invention relates to a testing device and method for basic structural parameters of an optical waveguide ring resonant cavity. Background technique [0002] The optical waveguide ring resonator is the core sensitive part of the resonant micro optical gyroscope, and the most basic ring resonator structure is formed by directly connecting one output port of a directional coupler with an input port. In ring resonators, clarity is often used to measure its performance index, which is defined as the ratio of the interval between two adjacent resonant frequencies to the half-height width of resonant cavity spectral lines. The clarity is determined by the basic structural parameters of the ring resonator, including the coupler coupling coefficient and additional loss and waveguide transmission loss. [0003] In some previous methods and devices that use the resonance curve of the test ring resonator to obtain the basic structural parameters of the ring r...

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Problems solved by technology

[0003] In some previous methods and devices that use the resonance curve of the test ring resonator to obtain the basic structural parameters of the ring resonator, these three basic structural parameters: coupler coupling coefficient, coupler additional loss and waveguide transmission loss are not fully integrated. It is calculated independently, and the other two parameters are generally obtained by testing the resonance curve of the ring cavity based on known or testing any one of the parameters separately. These test devices are complicated, the calculation accuracy is low, and the repeatability is poor.

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