Device and method for measuring 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 a high temperature. The device comprises a set of all-fiber test system and a set of high-temperaturefurnace system, wherein the all-fiber test system comprises a probe light (or pump light), a connection optical fiber, an optical splitter, a light beam combiner, an optical isolator, an optical fiber to be measured, a detection device and the like; and the high-temperature furnace system comprises a heat preservation cavity, heating gas, a heating gas inlet, a heating gas outlet, a gas fan, a thermometer, a gas pipeline, a pipeline switch, a gas heating device, a gas cooling device, a gas pump, an optical fiber objective table, an inlet of the optical fiber to be measured, an outlet of the optical fiber to be measured and the like. In the testing process, the optical fiber to be measured is placed in the high-temperature furnace system, a test light path is set up in sequence, then the heat preservation cavity in a high-temperature furnace is emptied (the humidity and cleanliness in the cavity meet the experiment requirements), then the heat preservation cavity is sealed, finally thetemperature in the cavity meets the temperature needed by testing, and meanwhile the optical fiber to be measured is measured.

Description

technical field [0001] The invention belongs to the technical field of optical fiber measurement, and more specifically relates to a device and method for measuring the performance of an optical fiber at high temperature. Background technique [0002] With the development of science and technology, special optical fibers are widely used in industrial processing, medical, aerospace, military and other fields, and the tests on these optical fibers are usually carried out at room temperature, except for some specific aging or stability experimental tests (this The test temperature generally does not exceed 100°C). 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 per...

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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