Method for measuring geometric parameter of single mode fiber

Abstract

The invention relates to a method for measuring geometric parameters of monomode optical fiber. The method utilizes a common laser as a light source, couples lights into optical fiber through a precise five-dimensional adjusting rack with a lens and an optical fiber griping handle, utilizes CCD or other imaging systems for data acquisition, analyzes the obtained data by a computer, uses a Mathematica mathematical software to process and calculate the measured light intensity distribution graph under visible light and uses a nonlinear least square fitting method to calculate the geometric parameters of the optical fiber, which comprises fiber core refractive index n1, cladding refractive index n2 and fiber core radius a. The method utilizes the common semiconductor laser as a light source, has convenient use, needs little equipment and low cost, and has no strict requirement on environment. The method utilizes visible light wave band for mensuration, avoids using an infrared detector and an infrared laser source with high price, is convenient to adjust by naked eyes at the same time and also convenient to acquire information of light intensity, utilizes CCD to detect the light intensity distribution of the output end of the optical fiber, can carry out full-field mensuration, acquire total data once and avoid using mechanical movable scanning equipment.

Description

technical field [0001] The invention relates to a method for measuring geometric parameters of a single-mode optical fiber, which belongs to the field of information technology. Background technique [0002] Single-mode fiber geometric parameters include the core refractive index n 1 , cladding index n 2 , core radius a. They are the most basic parameters of optical fiber, and other characteristic parameters of optical fiber, such as optical characteristic parameters and transmission characteristic parameters, all depend on geometric parameters. Therefore, it is of great significance to measure the geometric parameters of single-mode fiber. The traditional method of measuring the refractive index of optical fiber is the near-field scanning method, which requires highly delicate optical equipment, expensive equipment, complicated measurement process and long measurement time. The traditional method of measuring the radius of the fiber core is the backscattering method, wh...

AI Technical Summary

Problems solved by technology

The traditional method of measuring the refractive index of optical fiber is the near-field scanning method, which requires highly sophisticated optical equipment, expensive equipment, complicated measurement process, and long measurement time

The traditional method of measuring the core radius is the backscattering method, which is only suitable for the measurement during the fiber manufacturing process

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