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Measuring device and method for focusing constant g of self-focusing fiber

A technology of focusing constant and measuring device, which is applied in the direction of phase influence characteristic measurement, optical performance test, etc., to achieve the effect of automatic precision alignment and linear scanning, easy operation, and improved detection efficiency and accuracy

Active Publication Date: 2017-03-15
SHANGHAI UNIV
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Problems solved by technology

At present, for the optical performance test of self-focusing fiber, most of them focus on obtaining the refractive index distribution profile by using refraction method, interferometry and other methods, lacking the focus constant g Further testing and analysis of

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  • Measuring device and method for focusing constant g of self-focusing fiber

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0041] see figure 1 and figure 2 , a self-focusing fiber focusing constant g The measurement device includes a self-focusing optical fiber refractive index measurement device and a self-focusing optical fiber end face pretreatment device; the self-focusing optical fiber refractive index measurement device includes a light source 101, a focusing lens combination 102, a Z-axis stepping motor 103, and a cover glass 104 , X-Y axis precision adjustment table 105, sample cavity 106, clamping frame 107, ellipsoidal mirror 108, detector 109, computer 110, base 111 and optical fiber fixture 112; Described optical fiber fixture 112 is in the fashion of measuring self-focusing optical fiber refractive index Clamped on the clamping frame 107, the clamping frame 107 and the sample chamber 106 are fixed on the X-Y axis fine adjustment table 105, and the X-Y axis f...

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Abstract

The invention discloses a device and method for measuring the focusing constant g of a self-focusing optical fiber. The measuring device comprises an optical fiber preprocessing device and an optical fiber refractive index measuring device. Cover glass is arranged in the center of a hole in the bottom of a sample cavity through gel, the sample cavity is cleaned, and the matching solution is injected in the sample cavity till the sample cavity is full of the matching solution. A bare optical fiber is arranged in an optical fiber clamp, and the bare optical fiber is clamped in a clamping frame after being cut and polished. The optical fiber is pushed till the end face of the optical fiber makes contact with the cover glass. An automatic alignment and one-dimensional linear scanning mode is set in a computer, and a refractive index distribution skeleton map is rapidly obtained. According to the refractive index distribution skeleton map detected by the measuring device, the refractive index data in a fiber core are extracted, and the measurement on the focusing constant g and the center refractive index n0 of the self-focusing optical fiber is achieved through the curve fitting algorithm.

Description

technical field [0001] The invention relates to the field of optical fiber performance analysis, in particular to a device and method for measuring the focusing constant g of a self-focusing optical fiber. Background technique [0002] Self-focusing fiber (Sel-focusing fiber), also known as gradient-index fiber (Gradient-index fiber), is a kind of fiber whose refractive index distribution changes gradually along the radial direction. . The self-focusing fiber optic lens made of self-focusing fiber has the same self-focusing function as the self-focusing lens, and at the same time has the advantages of optical fiber: good light transmission performance, small size, easy to couple with single-mode fiber, etc. Therefore, in recent years, self-focusing fiber optic lens It has broad application prospects in the imaging examination of narrow tissues such as cardiovascular. (1.E. Swanson, C.L.Petersen, et al.. Ultrasmall optical probes, imaging optics, and methods for using same ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/02G01N21/41
Inventor 王驰许婷婷毕书博余琨杨雅雯
Owner SHANGHAI UNIV
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