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A detection method and detection device for optical fiber internal absorption characteristics

A technology of absorption characteristics and detection methods, which is applied in the field of detection methods and detection devices for internal absorption characteristics of optical fibers, can solve the problems of inability to obtain optical fiber absorption characteristics and defect spatial distribution, and achieve high resolution and high sensitivity effects

Active Publication Date: 2016-02-24
HEFEI ZHICHANG PHOTOELECTRIC TECH
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Problems solved by technology

The loss measured in this way is the overall loss of the fiber, including not only the loss caused by the fiber’s absorption of beam energy, but also the loss caused by the scattering inside the fiber, and the absorption characteristics and defect spatial distribution inside the fiber cannot be obtained

Method used

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  • A detection method and detection device for optical fiber internal absorption characteristics
  • A detection method and detection device for optical fiber internal absorption characteristics

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Embodiment Construction

[0027] Such as figure 1 As shown, the pump laser beam 100 emitted by the pump light source is coupled into the fiber under test 6 and propagates therein. Due to the absorption of the laser light by the fiber itself, the temperature of the fiber will rise in the area where the pump beam passes, so that the fiber Changes in physical properties, such as thermal expansion, refractive index changes, etc. At this time, a weaker probing beam 800 is focused by the probing light first converging device 11 and irradiated onto the optical fiber 6 under test and passes through the optical fiber 6 under test. For this incident probing beam 800, the measured The optical fiber 6 is equivalent to a "cylindrical lens". Due to the above-mentioned changes in optical fiber physical properties caused by light absorption, the propagation characteristics of the probe beam 801 passing through the tested optical fiber 6 will also change accordingly, for example, additional convergence or divergence e...

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Abstract

The invention provides a method and device for detecting internal absorption characteristics of an optical fiber. According to the method, the internal absorption characteristics of the optical fiber are detected based on the effect that when a laser is transmitted in the optical fiber, the laser beam is absorbed by the optical fiber, the local temperature of the optical fiber rises and then local physical characteristics of the optical fiber change, spatial distribution of the internal absorption characteristics of the optical fiber can be obtained, and accordingly spatial distribution of internal defects of the optical fiber can be obtained. The device has the advantages of being high in resolution and sensitivity and the like.

Description

technical field [0001] The invention relates to the technical field of optical fiber characteristic detection, in particular to a detection method and detection device for the internal absorption characteristic of an optical fiber. Background technique [0002] Optical fiber technology is widely used, from modern communications, to various sensing technologies, to new light sources, etc., optical fiber is an indispensable key material. Especially in recent years, with the rapid development of high-power laser technology and applications, new requirements are put forward for the performance of the optical fiber itself. [0003] Absorption inside the fiber is a key factor affecting beam propagation, the smaller the absorption, the longer the beam propagation distance. In addition, there will be local defects in the fiber due to various reasons such as manufacturing and uneven doping. These defects often have a bad influence on the beam propagation in the fiber. These defects...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/02G01N25/72
Inventor 吴周令陈坚
Owner HEFEI ZHICHANG PHOTOELECTRIC TECH