Cladded pumping optical fiber capable of efficiently adsorbing pumping light

A high-efficiency technology for pumping optical fibers, applied in the direction of cladding optical fibers, graded index core/clad optical fibers, multi-layer core/clad optical fibers, etc., can solve low flexibility, difficult pump absorption, Problems such as high splicing loss of optical fiber, to achieve good flexibility, simplify the process flow, and reduce the effect of splicing loss

Inactive Publication Date: 2011-07-06
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the difficulties in pump absorption of the existing circularly symmetrical inner cladding structure double-clad optical fiber and the problems of high splicing loss and low flexibility of the non-circularly symmetrical inner cladding structure double

Method used

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  • Cladded pumping optical fiber capable of efficiently adsorbing pumping light
  • Cladded pumping optical fiber capable of efficiently adsorbing pumping light
  • Cladded pumping optical fiber capable of efficiently adsorbing pumping light

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Embodiment 1

[0031] The double-clad rare-earth-doped optical fiber of the present invention includes three parts: core 1, inner cladding 2 and outer cladding 3, the refractive index of the core region is uniformly distributed, and its refractive index is the largest, and the refractive index of the outer cladding is also uniformly distributed , its refractive index is the smallest, and the inner cladding is composed of 10 layers of quartz structures whose refractive index changes from high to low, such as Figure 5 As shown, the gradual change of the inner cladding refractive index is realized through the multi-layer structure, the inner cladding refractive index gradually decreases from the core to the outer cladding direction, the core refractive index is greater than the maximum refractive index of the inner cladding, and the outer cladding refractive index is smaller than the inner cladding minimum refractive index.

Embodiment 2

[0033] Such as Figure 6 As shown, the structure of this embodiment is basically the same as that of Embodiment 1, except that the inner cladding is composed of 20 layers of quartz whose refractive index varies from high to low.

Embodiment 3

[0035] Such as Figure 7As shown, the structure of this embodiment is basically the same as that of Embodiment 1, except that the inner cladding is composed of 30 layers of quartz whose refractive index varies from high to low.

[0036] The more layers of the stepped inner cladding structure, the closer the refractive index distribution of the inner cladding is to continuous, but the manufacturing difficulty will also increase relatively.

[0037] Figure 4 It is a comparison chart of the pump absorption coefficient of step type and graded double clad fiber. The data is calculated through a strict mathematical model. The same size of incident pump beam, doped core radius, and core absorption coefficient are used in the calculation. and inner cladding area.

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Abstract

The invention discloses a cladded pumping optical fiber capable of efficiently adsorbing pumping light and belongs to the field of manufacturing of a special optical fiber. The optical fiber comprises a fiber core, an inner cladding layer and an outer cladding layer from inside to outside sequentially, wherein the refractive index of the inner cladding layer is gradually reduced from the direction of the fiber core to the direction of the outer cladding layer; the refractive index of the fiber core is more than the maximum refractive index of the inner cladding layer; the refractive index of the outer cladding layer is less than the minimum refractive index of the inner cladding layer; and the section of the inner cladding layer is in a round shape. By the cladded pumping optical fiber, the problems of difficulty of the double cladding layer optical fiber with a step refractive index profile circle symmetric inner cladding layer structure in pumping adsorption and high splicing loss, low flexibility and the like of the double cladding layer optical fiber with a non-circle symmetric inner cladding layer structure are solved. In the invention, a rare-earth doped optical fiber has the characteristics of high pumping adsorption, low splicing loss, high flexibility and the like, is easy to manufacture and is very suitable for manufacturing a high-power pumping coupling optical fiber laser and a high-power pumping coupling optical fiber amplifier with high cost performances.

Description

technical field [0001] The invention belongs to the field of special optical fiber manufacturing, and relates to a double-clad rare-earth-doped optical fiber structure for high-power optical fiber lasers and optical fiber amplifiers that absorbs pump light with high efficiency. Background technique [0002] Since the birth of rare earth-doped fiber lasers and fiber amplifiers, they have been widely used in many fields such as communication, medical treatment, sensing and military due to their advantages of high efficiency, simplicity, stability and strong compatibility. Early rare-earth doped fiber lasers and fiber amplifiers mostly used a single-cladding structure, and the pump light and lasing laser propagated together in the doped fiber core, that is, the fiber core pumping mode. In this mode, the fiber core is a single-mode type , the core diameter is very small (usually no more than 10 μm), so this type of fiber laser has better beam quality. However, under fiber core ...

Claims

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Application Information

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IPC IPC(8): G02B6/036G02B6/028C03B37/027
CPCC03B37/01807C03B2203/26C03B2203/23C03B37/01413C03B2201/34
Inventor 延凤平刘鹏陶沛琳李琦冯亭彭万敬
Owner BEIJING JIAOTONG UNIV
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