Device and method for detecting microbending loss of optical fiber

Abstract

The invention provides a device and method for detecting the microbending loss of an optical fiber, relating to the field of detection of optical fibers. The device comprises a metal cover plate, a metal mesh, a rubber plate and a metal base, wherein two marked lines with the spacing distance of 20-30 mm and the length of 145-155 mm are arranged on the rubber plate, and the length of the metal mesh is the same as that of the marked lines. The method for detecting the microbending loss of the optical fiber, provided by the invention, comprises the following steps of: reserving a free end from the optical fiber, connecting the free end with an optical power meter, fixing the optical fiber on one marked line, making a circle around posts by using the optical fiber, fixing the optical fiber on the other marked line, reserving another free end, and connecting the another free end with the optical power meter; sleeving the metal mesh on the metal base, sleeving the metal cover plate on the metal base, and recording a numerical value displayed by the optical power meter; adding a weight on the metal cover plate, and recording a numerical value displayed by the optical power meter; and obtaining a difference value of the two numerical values, thereby obtaining the microbending loss of the optical fiber. The device for detecting the microbending loss of the optical fiber, provided by the invention, is simple and convenient in operation; and the method is simple and accurate.

Description

technical field [0001] The invention relates to the field of optical fiber inspection, in particular to a method for detecting microbend loss in optical properties of optical fibers. Background technique [0002] The bending loss of optical fiber can be divided into microbending loss and macrobending loss. The routine inspection of optical fiber is to check the macrobending loss of optical fiber, and the microbending loss is not taken seriously by people. With the continuous research on optical fiber technology, it is found that the microbending loss has a certain influence on the performance of optical fiber. [0003] The so-called microbending loss is the effect of uneven stress on the optical fiber, such as when the optical fiber is subjected to side pressure or the temperature change of the sheathed optical fiber, the optical fiber axis is slightly irregularly bent, and the result is that the conduction mode is transformed into a radiation mode, resulting in light energy...

AI Technical Summary

Problems solved by technology

Many manufacturers are doing research on microbending loss, and have also proposed some in-factory inspection methods, but there are major defects: poor practicability, poor accuracy, and relatively poor repeatability

The disadvantages of this method are: (1) There will be errors when the optical fiber is wound into a 98mm circle. Different people may have different sizes and shapes when winding the circle, and the winding will increase the twist of the optical fiber and cause deviations in the fiber test data. , the repeatability will be reduced, and the accuracy will also be reduced (2) The use of tape also makes the force of the optical fiber uneven, and the formation of microbends is also inaccurate

(3) The gap on the rubber sheet that reduces the length of the marking circle by 8mm also increases the uncertainty

Therefore, the metal grid method also has the disadvantages of poor repeatability and accuracy.

(4) There are only two positioning columns, and the positioning accuracy is not high

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