A device and method for measuring the performance of optical fiber at high temperature

Abstract

The invention discloses a device and a method for measuring the performance of an optical fiber at high temperature. The device includes an all-fiber test system and a high-temperature furnace system. The all-fiber test system includes probe light (or pump light), connecting fibers, optical splitters, optical combiners, optical isolators, optical fibers to be tested, and detection devices. and other components; high temperature furnace system insulation cavity, heating gas, heating gas inlet, heating gas outlet, gas fan, thermometer, gas pipeline, pipeline switch, gas heating device, gas cooling device, gas pump, optical fiber stage , the entrance of the optical fiber to be tested, the exit of the optical fiber to be tested, etc. During the test, the optical fiber to be tested is placed in the high-temperature furnace system, and the test optical path is built in turn, and then the heat preservation cavity in the high-temperature furnace is evacuated (so that the internal humidity and cleanliness of the cavity meet the experimental requirements), and then the heat preservation cavity is sealed body, and finally make the inside of the cavity reach the temperature required for the test and measure the optical fiber to be tested at the same time.

Description

Device and method for measuring performance of optical fiber at high temperature technical field The invention belongs to the technical field of optical fiber measurement, more specifically, relate to a kind of device for measuring the performance of optical fiber at high temperature. settings and methods. Background technique With the development of science and technology, special optical fibers have been widely used in industrial processing, medical, aerospace, military and other fields. applications, and testing of these fibers is usually performed at room temperature, except for some specific aging or stability experiments. Test (this test temperature generally does not exceed 100 ℃). However, in the field of fiber lasers, rare earth-doped fibers, passive Matching fibers and large core diameter fibers need to generate or transmit high-power lasers, and the fiber core is caused by the loss of the fiber itself. The temperature is extremely high (above hundreds o...

AI Technical Summary

Problems solved by technology

However, in the field of fiber lasers, rare earth-doped fibers, passive matching fibers, and large-core fibers need to generate or transmit high-power lasers. Due to the loss of the fiber itself, the temperature of the fiber core is extremely high (above hundreds of degrees Celsius). Although the optical fiber is air-cooled or water-cooled in order to protect the performance of the optical fiber during use (generally, the coating temperature of the optical fiber cannot exceed 80°C), since the optical fiber glass part is usually silica and its co-dopants, the thermal conductivity Extremely low resulting in fiber core operating temperatures typically reaching 100-300°C

However, the existing measurements of the loss of passive matching fiber, large core diameter fiber, and loss, absorption coefficient, conversion efficiency, photo-darkening, beam quality, and mode of rare-earth-doped fiber are still carried out at room temperature, which is not very good. Reflect the performance of the fiber in use

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