Air hole few-mode gain equalization optical fiber based on layered doping

A gain equalization and air hole technology, applied in multi-layer core/clad fibers, clad fibers, multi-core fibers, etc., can solve the problem of not fully utilizing the core, achieve good gain equalization characteristics, reduce the crosstalk and increase the effect of the effective refractive index difference

Active Publication Date: 2020-12-18
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Both of these two articles use the layered doping method to design the doping profile of the fiber core, which can reduce the gain difference between the modes in the fiber to a certain extent, but only part of the core area is doped, and the core is not realized. full use of

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  • Air hole few-mode gain equalization optical fiber based on layered doping
  • Air hole few-mode gain equalization optical fiber based on layered doping
  • Air hole few-mode gain equalization optical fiber based on layered doping

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Embodiment 1

[0022] An air-hole few-mode gain-balanced fiber based on layered doping, such as figure 1 , figure 2 As shown, it includes an air hole 1, a core 2, a trench 3, and a cladding 4, and the core 2 is divided into two concentric circular regions according to the doping concentration, which are 21 and 22 from the inside to the outside, where Erbium-doped concentration 21≠22. The radius of the air hole 1 is 1.5 μm, the radius of the core 2 is 7.5 μm, the radius of the trench 3 is 12 μm, the radius of the cladding 4 is 55 μm, the refractive index of the core 2 is 1.452, and the refractive index of the trench 3 is 1.438, the refractive index of the cladding layer 4 is 1.444, the radius of the doped region 21 is 4.5 μm, the radius of the doped region 22 is 7.5 μm, and the erbium-doped concentration ratio of the doped region 21 and the doped region 22 is 0.68:1.

[0023] Further, the portion with insufficient refractive index in the doped region 21 is supplemented by doping aluminum / g...

Embodiment 2

[0025] An air-hole few-mode gain-balanced fiber based on layered doping, such as image 3 , Figure 4 As shown, it includes an air hole 1, a core 2, a trench 3, and a cladding 4, and the core 2 is divided into three concentric regions according to the doping concentration, which are 21, 22, and 23 from the inside to the outside. , where the Erbium-doped concentration 21≠22≠23. The radius of the air hole 1 is 2 μm, the radius of the core 2 is 9 μm, the radius of the trench 3 is 13 μm, the radius of the cladding 4 is 62.5 μm, the refractive index of the core 2 is 1.452, and the refractive index of the trench 3 is 1.438 , the refractive index of the cladding layer 4 is 1.444, the radius of the doped region 21 is 5 μm, the radius of the doped region 22 is 7 μm, the radius of the doped region 23 is 9 μm, the doped region 21, the doped region 22 and the doped region The erbium-doped concentration ratio of 23 is 0.81:0.42:1.

[0026] Further, the part with insufficient refractive ...

Embodiment 3

[0028] An air-hole few-mode gain-balanced fiber based on layered doping, such as Figure 5 , Image 6 As shown, it includes an air hole 1, a fiber core 2, a groove 3 and a cladding 4. The fiber core 2 is divided into two concentric circles according to the difference in refractive index, which are 21 and 22 from the inside to the outside, where the refraction ratio 21<22, and the region of the core 22 is divided into two concentric circle regions according to the doping concentration, which are 221 and 222 from the inside to the outside, wherein the doping concentration inside the core is 21≠221≠222. The radius of the air hole 1 is 1.8 μm, the radius of the fiber core 2 is 8 μm, the radius of the low refractive index fiber core 21 is 4.5 μm, the radius of the high refractive index fiber core 22 is 8 μm, and the radius of the groove 3 is 11 μm. The radius of layer 4 is 75 μm, the refractive index of core 21 is 1.452, the refractive index of fiber core 22 is 1.456, the refracti...

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Abstract

The invention provides an air hole few-mode gain equalization optical fiber based on layered doping, and belongs to the fields of optical fiber communication, special optical fibers, optical fiber lasers and the like. By means of the scheme of combining the central air hole and the fiber core layered doping design, the mode field distribution of different modes in the optical fiber is regulated and controlled while generation of part of high-order modes is restrained, the gain difference between transmission modes is effectively reduced, and the good gain balance characteristic is achieved. The refractive index of the fiber core is matched by doping aluminum / germanium or fluorine, and meanwhile, the radius, refractive index distribution and the like of the fiber core are properly selected,so that a relatively large effective refractive index difference between modes can be realized, the inter-core crosstalk is reduced, and the wide application of the optical fiber is facilitated.

Description

technical field [0001] The invention relates to an air hole few-mode gain-balanced optical fiber based on layered doping, which belongs to the fields of optical fiber communication, special optical fiber, optical fiber laser and the like. Background technique [0002] In recent years, with the rapid development of cloud computing, big data, artificial intelligence, and 5G services, people's demand for communication capacity has risen sharply. Space division multiplexing technology (SDM) is considered to be a key technology for upgrading and expanding optical communication systems. One of them has been extensively studied by scholars. As a relay device, the optical amplifier can compensate the energy loss in the transmission process and ensure the long-distance and stable transmission of the communication system. There is an energy difference, and as the transmission distance accumulates, it will eventually lead to an increase in the bit error rate at the receiving end, resu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02G02B6/032G02B6/036
CPCG02B6/02042G02B6/02295G02B6/032G02B6/03611
Inventor 李祉祺裴丽王建帅郑晶晶宁提纲李晶王春灿
Owner BEIJING JIAOTONG UNIV
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