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Layered doped step type weak coupling gain balanced four-mode erbium-doped optical fiber

A gain equalization, erbium-doped fiber technology, applied in multi-layer core/clad fibers, clad fibers, multi-core fibers, etc., can solve the problems of increasing the complexity of the fiber manufacturing process and increasing the loss, and achieve good mode gain. Equalization characteristics, reducing mode gain difference, reducing mode crosstalk effect

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

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Problems solved by technology

It can reduce the gain difference, but the loss of the connection will be greatly increased due to the mismatch between the ring core fiber and the commonly used transmission fiber
The third is in the paper OptLett, vol.43, no.7, pp.1550-1553, Apr 1 2018 and Design of a Weakly-Coupled Ring-Core FMF and Demonstration of 6-mode 10-km IM / DD Doping is carried out in the three-layer core model of Transmission, OFC2018, and the core refractive index is divided into three types, which increases the complexity of the fiber manufacturing process

Method used

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  • Layered doped step type weak coupling gain balanced four-mode erbium-doped optical fiber
  • Layered doped step type weak coupling gain balanced four-mode erbium-doped optical fiber
  • Layered doped step type weak coupling gain balanced four-mode erbium-doped optical fiber

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Experimental program
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Effect test

Embodiment approach 1

[0024] A step-type weak-coupling gain-balanced four-mode erbium-doped fiber with layered doping, such as figure 1 , figure 2 As shown, it includes the core 1, the cladding 2, and the core 1 is divided into two concentric circles according to the erbium-doped concentration, which are 11 and 12 from the inside to the outside, and the erbium-doped concentration 11≠12. The radius of the core 1 is 6 μm, the radius of the cladding 2 is 62.5 μm, the refractive index of the core is 1.459, and the refractive index of the cladding is 1.459. The doped region 11 has a radius of 4.5 μm, and the doped region 12 has a radius of 6 μm. The erbium-doped concentration ratio of the doped region 11 and the doped region 12 is 0.61:1.

[0025] Further, the insufficient portion of the refractive index in the area of ​​the erbium-doped layer 11 can be supplemented by co-doping aluminum or germanium, and the surplus portion of the refractive index in the area of ​​the erbium-doped layer 12 can be el...

Embodiment approach 2

[0027] A step-type weak-coupling gain-balanced four-mode erbium-doped fiber with layered doping, such as image 3 , Figure 4 As shown, it includes core 1, cladding 2, and core 1 is divided into three concentric circles according to the erbium-doped concentration, which are 11, 12 and 13 from the inside to the outside, where the erbium-doped concentration 11≠12 ≠13. The radius of the core 1 is 6 μm, the radius of the cladding 2 is 62.5 μm, the refractive index of the core is 1.459, and the refractive index of the cladding is 1.459. The doped region 11 has a radius of 2 μm, the doped region 12 has a radius of 4 μm, and the doped region 13 has a radius of 6 μm. The erbium-doped concentration ratio of the doped region 11 , the doped region 12 and the doped region 13 is 0.9:0.47:1.

[0028] Further, the deficient part of the refractive index in the Erbium-doped layer 11 and the Erbium-doped layer 12 area can be supplemented by co-doping aluminum or germanium, and the surplus pa...

Embodiment approach 3

[0030] A step-type weak-coupling gain-balanced four-mode erbium-doped fiber with layered doping, such as Figure 5 , Figure 6 As shown, it includes core 1, cladding 2, and core 1 is divided into three concentric circles according to the erbium-doped concentration, which are 11, 12 and 13 from the inside to the outside, where the erbium-doped concentration 11≠12 ≠13. The radius of the core 1 is 6 μm, the radius of the cladding 2 is 62.5 μm, the refractive index of the core is 1.459, and the refractive index of the cladding is 1.459. The doped region 11 has a radius of 2 μm, the doped region 12 has a radius of 4.5 μm, and the doped region 13 has a radius of 6 μm. The erbium-doped concentration ratio of the doped region 11 , the doped region 12 and the doped region 13 is 0.76:0.494:1.

[0031]Further, the deficient part of the refractive index in the Erbium-doped layer 11 and the Erbium-doped layer 12 area can be supplemented by co-doping aluminum or germanium, and the surplu...

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Abstract

The invention provides a layered doped step type weak coupling gain equalization four-mode erbium-doped optical fiber. The refractive indexes of the fiber core and the cladding of the optical fiber are integrally kept in a step type, the fiber core part is two or more layers of concentric circles which are adjacent in sequence, and the erbium-doped concentrations of the layers are different. The part with insufficient refractive index or surplus of each layer is supplemented or eliminated through co-doped elements. According to the optical fiber, under the condition that the number of modes isclose to that of transmission optical fibers, the mode gain difference is effectively reduced, and the good mode gain equalization characteristic is achieved. Meanwhile, due to the proper selection of the refractive index and radius of the optical fiber, the refractive index difference between the modes is large, the mode crosstalk is effectively reduced, and the application in optical communication and optical wavelength division multiplexing systems is facilitated.

Description

technical field [0001] The invention relates to a layered-doped step-type weak-coupling gain-balanced four-mode erbium-doped optical fiber, which belongs to the field related to optical information processing such as optical fiber communication, optical fiber sensing, and optical fiber laser. Background technique [0002] With the continuous improvement of social informatization, the number of global Internet users and the amount of network data are increasing exponentially, and the current communication capacity is close to the limit of existing transmission technologies. Since the space division multiplexing technology was proposed in 2009, it is considered to be a key technology to solve future communication needs and transmission capabilities. The mode division multiplexing based on the few-mode fiber is one of the important implementation methods of the space division multiplexing technology. Among them, the few-mode fiber is a special fiber that can simultaneously tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02G02B6/036
CPCG02B6/02042G02B6/03616
Inventor 裴丽赵琦王建帅郑晶晶魏淮王春灿李海粟宁提纲李晶
Owner BEIJING JIAOTONG UNIV
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