Multi-mode pump laser and optical fiber amplifier formed by same

Abstract

The invention relates to a multi-mode pump laser and an optical fiber amplifier formed by the same. The multi-mode pump laser comprises a multi-mode pump laser package module (1) and an output tail fiber (2-1), wherein the output tail fiber (2-1) is a doubly clad optical fiber, the multi-mode pump laser package module (1) comprises a pump laser package shell (1-4) and a pump laser die (1-1) built in the pump laser package shell (1-4), the output tail fiber at the outer part of the pump laser package shell (1-4) is provided with an optical fiber Bragg grating (2-2), the optical fiber amplifier comprises the multi-mode pump laser and a pump signal combiner, the output tail fiber of the multi-mode pump laser is connected with the pump end of the pump signal combiner, the signal end of the pump signal combiner adopts a common single-mode optical fiber, and both the pump end and the common end of the pump signal combiner adopt a doubly clad optical fiber. Under the same pump power, the optical fiber amplifier comprising the multi-mode pump laser and the pump signal combiner disclosed by the invention has lower noise index.

Description

[0001] technical field [0002] The invention relates to a multi-mode pumping laser and an optical fiber amplifier thereof, in particular to a pumping laser and an optical fiber amplifier applied to an erbium-ytterbium co-doped double-clad optical fiber amplifier. The invention belongs to the communication field. [0003] Background technique [0004] The Er / Yb Co-doped Double Clad Fiber Amplifier uses a multimode pump laser and Er / Yb Co-doped Double Clad Fiber (EYDF Er / Yb Co-doped Double Clad Fiber), breaking through the power of the traditional Er / Yb Co-doped Fiber Amplifier (EDFA). limit. At present, the available multimode pump laser power can reach about 100W (915~975nm), and EYDF's double-clad structure and fiber core erbium-ytterbium co-doped technology can solve the problem of multimode pump absorption and single-mode signal For the problem of amplification, the two are connected by a pump signal combiner, so that one or more pump lasers can simultaneously pump a s...

AI Technical Summary

Problems solved by technology

At present, most of the high-power pump laser pigtails use multimode fibers. Of course, the pump light also propagates in a multimode manner. In this way, when the pump light passes through the EYDF, it needs to reflect multiple times on the inner cladding to reach the fiber core, so that the pump light The overlap factor with the fiber core is relatively low, and the dopant ion inversion degree is relatively low, resulting in excessive noise of EYDFA

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