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Three-core multilayer erbium-ion-doped four-mode optical fiber with extremely small gain difference

A technology of gain difference and erbium ions, which is applied in the direction of multi-layer core/cladding optical fiber, cladding optical fiber, multi-core optical fiber, etc., can solve the problems of difficult optimization, low upper limit of optical fiber gain amplitude, etc. Crosstalk, reduce the difficulty of optimization, and easy gain equalization effect

Inactive Publication Date: 2021-01-05
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the optimization of few-mode active gain fibers based on step refractive index mainly depends on the optimization of dopant ion distribution, which is difficult to optimize; and the few-mode active gain fiber based on annular refractive index distribution is due to its special refractive index distribution. Design, coupled with the optimization of ion filling distribution, the mode gain difference is relatively small, but the upper limit of the gain amplitude of each mode in the fiber is low

Method used

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  • Three-core multilayer erbium-ion-doped four-mode optical fiber with extremely small gain difference
  • Three-core multilayer erbium-ion-doped four-mode optical fiber with extremely small gain difference
  • Three-core multilayer erbium-ion-doped four-mode optical fiber with extremely small gain difference

Examples

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Effect test

Embodiment 1

[0015] In this example, a three-layer core multilayer erbium-doped ion 4-mode fiber with a very small gain difference, such as figure 1 shown. This erbium-doped ion 4-mode optical fiber comprises a core 1, a groove 2 and a cladding 3, the core 1 is located at the center of the optical fiber, and the cladding 3 is located outside the core 1, and in the cladding 3, the distance from the core 1 is closer. Groove 2. Wherein, the fiber core 1 is further divided into three layers, the central layer 1-1 from the inside to the outside, the ring layer 1-2 and the outer core layer 1-3 are closely connected. Among them, the radius of the central layer 1-1 of the 4-mode erbium-doped fiber is 4.025 μm, and the difference between its refractive index and the refractive index of the cladding layer 3 is 0.01; The refractive index difference is 0.0121; the outer core layer 1-3 is located at 6.225-7.75 μm, and the refractive index difference between its refractive index and the cladding layer...

Embodiment 2

[0017] In this example, a three-layer core multilayer erbium-doped ion 4-mode fiber with a very small gain difference, such as figure 2 shown. The 4-mode erbium-doped optical fiber comprises a core 1, a groove 2 and a cladding 3, the core 1 is located at the center of the fiber, the cladding 3 is located outside the core 1, and a groove is formed near the core 1 in the cladding 3 Slot 2. Wherein, the fiber core 1 is further divided into three layers, the central layer 1-1 from the inside to the outside, the ring layer 1-2 and the outer core layer 1-3 are closely connected. Among them, the radius of the central layer 1-1 of the 4-mode erbium-doped fiber is 4.025 μm, and the difference between its refractive index and the refractive index of the cladding layer 3 is 0.01; The refractive index difference is 0.0121; the outer core layer 1-3 is located at 6.225-7.75 μm, and the refractive index difference between its refractive index and the cladding layer 3 is 0.0113; the trench...

Embodiment 3

[0019] In this example, a three-layer core multilayer erbium-doped ion 4-mode fiber with a very small gain difference, such as image 3 shown. The 4-mode erbium-doped optical fiber comprises a core 1, a groove 2 and a cladding 3, the core 1 is located at the center of the fiber, the cladding 3 is located outside the core 1, and a groove is formed near the core 1 in the cladding 3 Slot 2. Wherein, the fiber core 1 is further divided into three layers, the central layer 1-1 from the inside to the outside, the ring layer 1-2 and the outer core layer 1-3 are closely connected. Among them, the radius of the central layer 1-1 of the 4-module gain fiber is 4.025 μm, and the difference between its refractive index and the refractive index of the cladding layer 3 is 0.01; The refractive index difference is 0.0121; the outer core layer 1-3 is located at 6.225-7.75 μm, and the refractive index difference between its refractive index and the cladding layer 3 is 0.0113; the trench 2 is l...

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Abstract

The invention relates to a three-core multilayer erbium-doped ion four-mode optical fiber with extremely small gain difference, which comprises a fiber core 1, a groove 2 and a cladding 3, wherein thefiber core 1 is positioned at the center of the optical fiber, the cladding 3 is positioned outside the fiber core 1, and the groove 2 is arranged in the cladding 3 at a position closer to the fibercore 1. The fiber core 1 is divided into three layers, namely, a central layer 1-1, an annular layer 1-2 and an outer core layer 1-3 which are tightly connected. Ion doping is mainly concentrated in the area of the fiber core 1, the fiber core 1 is divided into three layers of rings for doping, and the three layers of ion filling areas are the same as the refractive index distribution areas of thecentral layer 1-1, the ring layer 1-2 and the outer core layer 1-3 of the erbium-doped ion four-mode optical fiber respectively. Due to the refractive index distribution assisted by the three-layer core groove, the optical fiber has a relatively high mode refractive index difference, the inter-mode crosstalk can be weakened, and the bending loss during application is reduced. Moreover, the refractive index distribution is helpful for reducing the power filling factor difference of each module, the difficulty of particle doping distribution optimization can be greatly reduced, and the gain equalization is easier to realize.

Description

technical field [0001] The invention relates to a three-layer core multilayer erbium-doped ion 4-mode optical fiber with extremely small gain difference, belonging to the field of optical fiber laser amplifiers. Background technique [0002] With the exponential growth of network data traffic, the information capacity of traditional single-mode fiber (SMF) transmission system can no longer meet the demand. In order to further improve the communication capacity, the space division multiplexing system based on mode division multiplexing and core division multiplexing It has been proposed and intensively studied in recent years. In-line optical amplifiers with high performance and low power consumption are essential for ultra-long-distance communication. In the mode division multiplexing system, due to the increase of the signal mode, the existing single-mode fiber amplifier is no longer applicable. When information is transmitted independently in each mode, a large intermoda...

Claims

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Application Information

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IPC IPC(8): G02B6/02G02B6/036
CPCG02B6/02042G02B6/02295G02B6/03611
Inventor 裴丽常彦彪宁提纲郑晶晶李晶王建帅赵琦李祉祺解宇恒徐琳徐文轩
Owner BEIJING JIAOTONG UNIV
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