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

Abstract

The invention discloses a device for testing basic structural parameters of an annular resonant cavity of an optical waveguide and a method thereof. The method comprises the following steps of: designing three reference straight waveguides with identical structure on an annular resonant cavity chip of the optical waveguide, coupling by an optical fiber coupler and testing the resonance curve of the annular cavity and the average output amplitude of the reference straight waveguides to obtain the specific values of all structural parameters of the annular resonant cavity of the optical waveguide, including coupling coefficient and additional loss of the coupler as well as transmission loss of the waveguides. The device for acquiring structural parameters of the annular resonant cavity of the optical waveguide comprises a sawtooth wave signal generator, which is sequentially connected with a laser, an annular resonant cavity chip of the optical waveguide, a PD detector, an oscilloscope and a computer. The invention can nondestructively, easily and directly acquire three basic structural parameters of the annular resonant cavity of the optical waveguide, which provides instruction for further designing high-performance resonant cavity of optical waveguide. Meanwhile, the invention has important scientific meanings and application values in improving limit sensitivity and performance of resonant micro-optical gyroscope.

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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