Light darkening testing device for rare earth-doped optical fiber

Abstract

The invention discloses a light darkening testing device for a rare earth-doped optical fiber, wherein the device comprises a visible light signal source, a passive matching optical fiber, a cladding light filter, a beam combiner, a tested rare-earth-doped optical fiber and a pump light filter which are sequentially connected; the input end of the beam combiner is further connected with a semiconductor laser; and a visible light beam emitted by the visible light signal source passes through the cladding light filter, the beam combiner, the measured optical fiber, the pump light filter and a wave filter and then enters a first power detector, and laser emitted by the semiconductor laser passes through the beam combiner, the tested optical fiber and the pump light filter and then is cut off at the position of the wave filter. According to the invention, the light darkening loss of a to-be-tested optical fiber at the laser working wavelength is indirectly calculated by using the power change after the visible light passes through the to-be-tested optical fiber, and compared with the prior art, the test can be completed in a shorter time. By arranging the cladding light filter and the pump light filter, cladding light from a signal source and pump light which is not absorbed and converted can be filtered, so that the test accuracy is improved.

Description

technical field [0001] The invention relates to a rare-earth-doped optical fiber darkening test technology, in particular to a rare-earth-doped optical fiber light-darkening test device. Background technique [0002] Due to the characteristics of good heat dissipation, compact structure, easy maintenance, and easy realization of high-power single-mode laser output, fiber lasers have remarkable application prospects in the fields of material processing, medical treatment, communication, remote sensing, and national defense security. However, in the engineering application process of fiber lasers, the output power will gradually decrease with time, which is called photon darkening effect. In fiber lasers, the rare earth-doped fiber is used as the gain medium for laser generation, and its performance can be said to be the most important limiting factor for the power increase of fiber lasers. Accurate evaluation of the photo-darkening performance of active optical fibers is hel...

AI Technical Summary

Problems solved by technology

This method takes a long time to test, and there is a high risk of burning optical fibers and optical devices during the test

However, the existing visible light test systems are often complex in structure, poor in optical structure stability, and poor in reliability of the test system.

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