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Method for measuring rare earth-doped double clad fiber cladding pump absorption coefficient

A double-clad optical fiber and absorption coefficient technology, which is applied in the direction of testing optical performance, optical waveguide coupling, spectrum investigation, etc., can solve the problems of complicated operation steps, low accuracy of measurement results, and complex optical path construction, etc., and achieve measurement work Simplified steps, less measurement data, and simplified operation steps

Inactive Publication Date: 2010-11-17
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0009] The purpose of the present invention is to provide a method for measuring the pumping absorption coefficient of the rare earth double-clad optical fiber cladding, which solves the problems of complex optical path construction, complicated operation steps, and low accuracy of measurement results

Method used

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  • Method for measuring rare earth-doped double clad fiber cladding pump absorption coefficient
  • Method for measuring rare earth-doped double clad fiber cladding pump absorption coefficient
  • Method for measuring rare earth-doped double clad fiber cladding pump absorption coefficient

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Embodiment

[0034] like figure 2 As shown, the example uses a semiconductor laser (LD) for pumping, a set of lens groups for spatial coupling (a collimating lens and a focusing lens), a dichroic film with high transparency to pump light and high reflection to laser light, and a For the fiber adjustment frame, a fiber fusion splicer that can be used to splice fibers of different specifications by manual operation and a spectrometer that can realize the difference method.

[0035] The example is used to measure the cladding pump absorption coefficient of Yb-doped double-clad fiber under 915nm pump light. The test fiber is produced by Fiberhome Company. It has a double-clad structure, the inner cladding diameter is 130um, and the core diameter is 10um. The shape of the inner cladding is hexagonal, the numerical aperture of the inner cladding is 0.46±0.01, and the length of the test fiber is L 1 In the range of 3.0m to 10.0m, it is wound on a standard fiber optic disk with a diameter not gr...

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Abstract

The invention discloses a method for measuring a rare earth-doped double clad fiber absorption coefficient. In the method, measured fiber length is changed; the spectral difference of the measured fiber under pump light is acquired by utilizing a spectrometer difference method; and the absorption coefficient is obtained by calculating according to the spectrometer difference. The method realizes the accurate and direct measurement of the rare earth-doped double clad fiber absorption coefficient and solves the problems of complicated light path construction, comprehensive operation steps and low accuracy of a measuring result by adopting a simple operation method.

Description

technical field [0001] The invention relates to a test method for optical fiber performance, in particular to a method for measuring the cladding pump absorption coefficient of a rare earth-doped double-clad optical fiber. Background technique [0002] Rare-earth-doped double-clad fiber is a key device for realizing high-power fiber lasers. Because the light in the double-clad fiber propagates in the inner cladding, the diameter and numerical aperture of the inner cladding are much larger than the core diameter and numerical aperture of ordinary single-mode fibers. The numerical aperture, so the use of double-clad fiber can greatly improve the fiber input power and withstand power, and then can manufacture high-power fiber lasers. [0003] The main factor that has restricted the development of domestic high-power rare-earth-doped double-clad lasers for a long time is the new rare-earth-doped double-clad fiber. In recent years, breakthroughs have been made in the localizatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02G01J3/28G02B6/255
Inventor 陆培祥张志楠李玉华
Owner HUAZHONG UNIV OF SCI & TECH
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