Rare earth doping optical fiber light source light path structure

Abstract

The invention relates to a rare earth doping optical fiber light source light path structure. Assemblies of the rare earth doping optical fiber source light path structure comprise a Faraday rotation reflector (1), an optical filter (2), a rare earth doping optical fiber, a pumping signal combiner (4), a pumping laser (5), an isolator (6) and an attenuator (7). One of connecting modes among the assemblies comprises the optical filter (2) is respectively connected with the Faraday rotation reflector (1) and the rare earth doping optical fiber (3), the other end of the rare earth doping optical fiber (3) is connected with a common end of the pumping signal combiner (4), a pumping end of the pumping signal combiner (4) is connected with the pumping laser (5), a transmission end of the pumping signal combiner (4) is connected with an input end of the isolator (6), and an output end of the isolator (6) is connected with an input end of the attenuator (7). The rare earth doping optical fiber light source light path structure can ensure the fact that shapes of light source spectrums of different output power grades are kept unchanged under the condition that the same type of an optical filter is used in a rare earth doping optical fiber light source, and therefore cost is reduced.

Description

technical field [0001] The invention relates to an optical path structure of a rare-earth-doped optical fiber light source, in particular to an optical path structure of a rare-earth-doped optical fiber light source with adjustable power and constant spectrum shape. The invention belongs to the field of optical fiber communication and optical fiber sensing. [0002] Background technique [0003] Due to the characteristics of high output power, wide spectrum, good wavelength stability, output spectrum polarization-independent and cost advantages, Erbium-doped fiber light sources are widely used in optical device testing, fiber grating sensing, fiber optic gyroscope, medical imaging and other fields. In the erbium-doped fiber light source, the pump laser excites the erbium ions in the ground state in the erbium-doped fiber to the upper energy level, and when the particle inversion degree in the erbium-doped fiber is high enough, the erbium ions in the upper energy level sponta...

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Problems solved by technology

This leads to the need to design different types of optical filters for erbium-doped fiber light sources with different output power levels, which additionally increases the cost of raw materials

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