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An air-hole few-mode gain-balanced fiber based on layered doping

A gain equalization, 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 Coupling characteristics, the effect of increasing the effective refractive index difference

Active Publication Date: 2022-02-01
BEIJING JIAOTONG UNIV
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  • Summary
  • 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

Method used

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  • An air-hole few-mode gain-balanced fiber based on layered doping
  • An air-hole few-mode gain-balanced fiber based on layered doping
  • An air-hole few-mode gain-balanced fiber based on layered doping

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Effect test

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, and the first doping layer is sequentially from the inside to the outside. 21. The second doped layer 22, wherein the 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 first doped layer 21 is 4.5 μm, the radius of the second doped layer 22 is 7.5 μm, the doping of the first doped layer 21 and the second doped layer 22 The erbium concentration ratio was 0.68:1.

[0023] Further, the portion with insu...

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 circles according to the doping concentration, and the first doping layer is in turn from the inside to the outside. 21. The second doped layer 22 and the third doped layer 23, wherein the Erbium-doped concentration is 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 first doped layer 21 is 5 μm, the radius of the second doped layer 22 is 7 μm, the radius of the third doped layer 23 is 9 μm, the first doped layer 21, The erbium-doped concentration ratio of the second doped laye...

Embodiment 3

[0028] An air-hole few-mode gain-balanced fiber based on layered doping, such as Figure 5 , Figure 6As 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. From the inside to the outside are the low refractive index core, The high-refractive-index fiber core, wherein the low-refractive-index fiber core is the first doped layer 21, and the high-refractive-index fiber core is divided into two concentric circular regions according to the doping concentration, and the second doped layer is sequentially from the inside to the outside. Layer 22, a third doped layer 23, wherein the doping concentration inside the core is 21≠22≠23. The radius of the air hole 1 is 1.8 μm, the radius of the core 2 is 8 μm, the radius of the low refractive index core is 4.5 μm, the radius of the high refractive index core is 8 μm, the radius of the groove 3 is 11 μm, and t...

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Abstract

The invention proposes an air-hole few-mode gain-balanced optical fiber based on layered doping, which belongs to the fields related to optical information processing such as optical fiber communication, special optical fiber, and optical fiber laser. Using the combination of the central air hole and the layered doping design of the fiber core, the generation of some high-order modes can be suppressed while the mode field distribution of different modes in the fiber can be adjusted, which effectively reduces the gain difference between the transmission modes and realizes Good gain equalization characteristics. Doping aluminum or germanium or fluorine to achieve the matching of the core refractive index, and at the same time properly selecting the core radius, refractive index distribution, etc., can achieve a large effective refractive index difference between modes and reduce crosstalk between cores, which is beneficial Its wide application.

Description

technical field [0001] The invention relates to an air hole few-mode gain-balanced optical fiber based on layered doping, and belongs to the fields related to optical information processing such as optical fiber communication, special optical fiber, and optical fiber laser. 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 e...

Claims

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Application Information

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Patent Type & Authority Patents(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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