Method for measuring optical waveguide transmission loss

Abstract

The invention relates to a method for measuring an optical waveguide transmission loss. The method comprises the following steps that: (1) a wide-spectrum light source is outputted and coupled to a first optical waveguide, after the optical waveguide is transmitted, the optical waveguide is coupled and outputted to a high-precision spectrometer through an optical waveguide chip, and the spectrometer obtains a first F-P resonator interference fringe, (2) the wide-spectrum light source is outputted and coupled to a second optical waveguide with a different length, after the optical waveguide istransmitted, the optical waveguide is coupled and outputted to the high-precision spectrometer through the optical waveguide chip, and the spectrometer obtains a second F-P resonator interference fringe, and (3) the transmission loss of the optical waveguide is calculated by the relationship between the transmission loss of the optical waveguide and the interference fringe according to the two F-Presonator interference fringes. The method has the advantages that the transmission loss of the optical waveguide is calculated by measuring the F-P resonator interference fringes of two segments ofoptical waveguides with different lengths, the accurate transmission loss of the optical waveguide can be calculated without knowing the reflectivity absolute value of a waveguide end face or a grating, and the measurement of the transmission losses of an end-coupled waveguide and a vertical grating-coupled optical waveguide can be simultaneously satisfied.

Description

technical field [0001] The invention relates to a method for measuring optical waveguide transmission loss, which belongs to the technical field of integrated photonic devices. Background technique [0002] In integrated photonic devices, optical waveguide is the most basic structure for constructing photonic integrated devices and chips. The basic building blocks of instruments, microring resonators, modulators, optical switches, etc. The basic function of an optical waveguide is to realize low-loss and low-distortion transmission of light waves, and its transmission loss is the most important indicator, which determines the performance of integrated photonic devices. [0003] The optical transmission loss mechanism of the optical waveguide mainly includes: 1) light scattering on the rough sidewall of the waveguide; 2) light leakage loss of the waveguide substrate; 3) absorption loss of the waveguide material; 4) waveguide bending radiation loss. The measurement of optica...

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a test method for optical waveguide transmission loss, and its purpose is to solve the problem that the traditional waveguide transmission loss test method is not accurate enough, and proposes an improved F-P cavity comparative analysis method, by measuring two sections of optical waveguide with different lengths The F-P cavity resonant fringes can be calculated to obtain the accurate transmission loss of the optical waveguide without knowing the absolute value of the reflection coefficient of the waveguide end face or the grating. This method can meet the transmission loss measurement of the end face coupled waveguide and the vertical grating coupled optical waveguide.

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