A method for measuring optical waveguide transmission loss

Abstract

The invention relates to a method for measuring the transmission loss of an optical waveguide, which includes the following steps: 1) The output of a wide-spectrum light source is coupled to a first optical waveguide, and after the optical waveguide is transmitted, it is coupled and output to a high-precision spectrometer through an optical waveguide chip, and the spectrometer measures Obtain the first F-P resonator interference fringe; 2) The output of the broadband light source is coupled to the second optical waveguide of different lengths. After the optical waveguide is transmitted, it is coupled to the high-precision spectrometer through the optical waveguide chip, and the spectrometer measures The second F-P resonator interference fringes; 3) According to the two F-P resonator interference fringes, the transmission loss of the optical waveguide is calculated using the relationship between the optical waveguide transmission loss and the interference fringes. Advantages: The transmission loss of the optical waveguide is calculated by measuring the F‑P cavity resonant fringes of two sections of optical waveguides with different lengths, and the accurate transmission loss of the optical waveguide can be calculated without knowing the absolute value of the reflectivity of the end face of the waveguide or the grating. And it can meet the transmission loss measurement of the end-face coupling waveguide and the vertical grating coupling optical waveguide at the same time.

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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