System and method for measuring loss and absorption of optical fiber

Abstract

The invention discloses a system and a method for measuring the loss and the absorption of an optical fiber. The system comprises a broadband light source, an optical switch, a first controller, an optical fiber combiner, a multi-mode optical fiber, and a spectrometer. The signal end of the optical fiber combiner is connected to the first output end of the optical switch. The pump end of the optical fiber combiner is connected to the second output end of the optical switch. One end of the multi-mode optical fiber is connected to one end of the optical fiber to be measured. The other end of themulti-mode optical fiber is connected to the spectrometer. The other end of the optical fiber to be measured is used for being connected to the output end of the optical fiber combiner. The first controller is connected to the control end of the optical switch. The signal light output by the broadband light source passes through the optical switch, and is selected by the first controller to be output from the first output end of the optical switch, and then injected into the signal end of the optical fiber combiner, or output from the second output end of the optical switch, and then injectedinto the pump end of the optical fiber combiner. The optical signal is injected into the optical fiber to be measured after passing through the optical fiber combiner, and is received by the spectrometer through the multi-mode optical fiber.

Description

technical field [0001] The invention belongs to the technical field of optical fiber multi-parameter measuring instruments, and more specifically relates to a fiber optic loss absorption measurement system and method. Background technique [0002] At present, fiber lasers have been widely used in various fields such as national defense, military affairs, industry, and medical treatment. As the output power of fiber laser continues to rise, quantum deficit and fiber loss cause heat deposition in the fiber, resulting in thermal lens effect, mode instability, etc., which limit the further increase of fiber laser power. In fiber lasers and amplifiers, double-clad fibers are generally used as the gain medium, and the cladding pumping method is adopted. The pump light is injected from the cladding, and the signal light is gained in the fiber core. The pump light and signal light are respectively transmitted in the cladding and the fiber core. Due to the existence of impurities, l...

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Problems solved by technology

[0004] Aiming at the defects of the prior art, the object of the present invention is to provide a loss absorption measurement system and method of an optical fiber, aiming at solving the problem that the core and the cladding of the double-clad active rare-earth doped optical fiber cannot be separately measured in the prior art. Problems with loss and absorption coefficient

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