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Air hole few-mode optical fiber supporting 14 modes, low crosstalk and easy MIMO processing

A few-mode fiber and air hole technology, applied in multi-core fibers, clad fibers, light guides, etc., can solve problems such as differential mode delay and inter-core crosstalk problems, increase the complexity of MIMO processing systems, etc., to achieve increased efficiency. Refractive index difference, differential delay reduction, the effect of reducing complexity

Pending Publication Date: 2021-12-10
SHUNDE GRADUATE SCHOOL UNIV OF SCI & TECH BEIJING +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides an air-hole few-mode optical fiber that supports 14 modes with low crosstalk and is easy to handle with MIMO, so as to solve the problem of the difference between modes as the number of transmission modes increases in a space division multiplexing system using few-mode optical fibers. The problems of mode delay and inter-core crosstalk are aggravated, and the technical problems of MIMO processing system complexity increase

Method used

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  • Air hole few-mode optical fiber supporting 14 modes, low crosstalk and easy MIMO processing
  • Air hole few-mode optical fiber supporting 14 modes, low crosstalk and easy MIMO processing

Examples

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no. 1 example

[0036] This embodiment provides an air-hole few-mode fiber that supports 14 modes with low crosstalk and easy MIMO processing, such as figure 1 As shown, the air hole few-mode optical fiber includes a core and a cladding 7 wrapping the core; wherein,

[0037] The fiber core includes a main fiber core and a plurality of air hole auxiliary fiber cores, the main fiber core is located at the center of the air hole few-mode fiber, and the plurality of air hole auxiliary fiber cores are distributed around the main fiber core; The main core includes an elliptical annular core 2 and a central core 1 located at the center of the elliptical annular core 2;

[0038] The refractive index of the central core 1 and the plurality of air hole auxiliary cores are the same; the refractive index of the elliptical annular core 2 is greater than the refractive index of the central core 1; the refractive index of the cladding 7 greater than the refractive index of the central core 1, and the refra...

no. 2 example

[0042] This embodiment provides an air-hole few-mode fiber that supports 14 modes with low crosstalk and easy MIMO processing, such as figure 1 As shown, the air hole few-mode optical fiber includes a core and a cladding 7 wrapping the core; wherein,

[0043] The fiber core includes a main fiber core and a plurality of air hole auxiliary fiber cores, the main fiber core is located at the center of the air hole few-mode fiber, and the plurality of air hole auxiliary fiber cores are distributed around the main fiber core; The main core includes an elliptical annular core 2 and a central core 1 located at the center of the elliptical annular core 2;

[0044] The refractive index of the central core 1 and the plurality of air hole auxiliary cores are the same; the refractive index of the elliptical annular core 2 is greater than the refractive index of the central core 1; the refractive index of the cladding 7 greater than the refractive index of the central core 1, and the refra...

no. 3 example

[0048] This embodiment provides an air-hole few-mode fiber that supports 14 modes with low crosstalk and easy MIMO processing, such as figure 1 As shown, the air hole few-mode optical fiber includes a core and a cladding 7 wrapping the core; wherein,

[0049] The fiber core includes a main fiber core and a plurality of air hole auxiliary fiber cores, the main fiber core is located at the center of the air hole few-mode fiber, and the plurality of air hole auxiliary fiber cores are distributed around the main fiber core; The main core includes an elliptical annular core 2 and a central core 1 located at the center of the elliptical annular core 2;

[0050] The refractive index of the central core 1 and the plurality of air hole auxiliary cores are the same; the refractive index of the elliptical annular core 2 is greater than the refractive index of the central core 1; the refractive index of the cladding 7 greater than the refractive index of the central core 1, and the refra...

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Abstract

The invention discloses an air hole few-mode optical fiber supporting 14 modes, low crosstalk and easy MIMO processing. The air hole few-mode optical fiber comprises a fiber core and a wrapping layer wrapping the fiber core, wherein the fiber core comprises a main fiber core and a plurality of air hole auxiliary fiber cores, the main fiber core is located in the center of the optical fiber, the plurality of air hole auxiliary fiber cores are distributed around the main fiber core, the main fiber core comprises an elliptical annular fiber core and a central fiber core positioned in the center of the elliptical annular fiber core, the refractive indexes of the central fiber core and the plurality of air hole auxiliary fiber cores are the same, the refractive index of the elliptical annular fiber core is greater than that of the central fiber core, and the refractive index of the wrapping layer is larger than that of the central fiber core and smaller than that of the elliptical annular fiber core. According to the invention, by introducing the elliptical annular fiber core and the air hole auxiliary fiber core, the circular symmetry of the refractive index distribution of the optical fiber is destroyed, the effective refractive index difference between the optical fibers is increased, the optical fiber supports a plurality of high-order modes, and the mode field distribution form of the high-order modes is fixed, so that the multi-channel transmission is ensured; and the optical fiber can reduce inter-core crosstalk and reduce differential mode delay.

Description

technical field [0001] The invention relates to the technical field of free space optical communication (FSO) and optical fiber communication, in particular to an air-hole few-mode optical fiber supporting 14 modes of low crosstalk and easy multiple-input-multiple-output (MIMO) processing. Background technique [0002] In recent years, the traffic of various communication services caused by cloud computing, big data, and streaming media has exploded, and the tolerance of optical fiber communication based on single-mode optical fiber is facing the limitation of approaching Shannon's limit. With the rapid development of optical communication technology, the current FSO-fiber hybrid communication system based on fiber coupling technology has received more and more attention. The FSO-optical fiber hybrid communication system is output by optical fiber, input by optical fiber or directly output by laser, and input by optical fiber. It has excellent performance in expanding networ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02
CPCG02B6/02042G02B6/02338
Inventor 陈宏尧陈怡瑾王建萍苏昱玮董涛殷杰刘海客
Owner SHUNDE GRADUATE SCHOOL UNIV OF SCI & TECH BEIJING
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