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Special-shaped air hole-assisted multi-core few-mode optical fiber

A multi-core, few-mode, air hole technology, applied in multi-core fibers, clad fibers, optics, etc., can solve the problems of increasing the complexity of demultiplexing at the receiving end, increasing the splicing loss, etc., achieving a simple structure and suppressing inter-mode Crosstalk, Effects of Controlling Fiber Size

Active Publication Date: 2021-09-07
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, different fiber core designs in this solution will increase the splicing loss with ordinary single-mode fibers, and will also increase the complexity of demultiplexing at the receiving end

Method used

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  • Special-shaped air hole-assisted multi-core few-mode optical fiber
  • Special-shaped air hole-assisted multi-core few-mode optical fiber
  • Special-shaped air hole-assisted multi-core few-mode optical fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A multi-core few-mode optical fiber assisted by a special-shaped air hole in this embodiment specifically provides a multi-core few-mode optical fiber assisted by a "clover" shaped air hole. figure 1 As shown, the optical fiber of this embodiment includes a hole-digging part in the center of the fiber and a cladding and a few-mode core part outside the air hole. The hole-digging part is a special-shaped air hole, and the diameter of the first air hole in the center is a=50 μm. The outer layer of an air hole is provided with four second air holes, and the center of the second air hole is located outside the first air hole, and the first air hole and the second air hole overlap, and the diameter of the second air hole is b=25 μm , the distance from the center of the second air hole in the outer layer to the cross-section center of the multi-core few-mode fiber assisted by the special-shaped air hole is c=30 μm, the diameter of the few-mode fiber core is d=15 μm, and the ce...

Embodiment 2

[0068] This embodiment provides a multi-core few-mode optical fiber assisted by a "four-leaf clover"-shaped air hole. The optical fiber in this embodiment includes a hole-digging part in the center of the fiber, a cladding and a few-mode core part outside the air hole, and the hole-digging Some are special-shaped air holes, the diameter of the first air hole in the center of the fiber section is a=50 μm, four second air holes are arranged on the outer layer of the first air hole, and the center of the second air hole is located outside the first air hole, And the first air hole coincides with the second air hole, the diameter of the second air hole is b=25 μm, and the distance from the center of the second air hole in the outer layer to the cross-section center of the multi-core few-mode fiber assisted by the special-shaped air hole is c=30 μm , few-mode fiber core diameter d=14 μ m, distance K=40 μ m from the center of few-mode fiber core to multi-core few-mode fiber section c...

Embodiment 3

[0074] A multi-core few-mode optical fiber assisted by special-shaped air holes in this embodiment is a "clover"-shaped multi-core few-mode optical fiber assisted by air holes. The cross-sectional view of the fiber is as follows Figure 13 As shown, it includes the cladding, the few-mode core and the special-shaped air hole arranged in the cladding, wherein the multi-core few-mode fiber assisted by the special-shaped air hole has a refractive index structure with a step distribution, and the material of the few-mode core The germanium-doped silica glass is selected, the cladding is pure silica glass, the refractive index of the few-mode fiber core>the refractive index of the cladding>the refractive index of the air hole, and the fiber cross-section is rotationally symmetrical.

[0075] The special-shaped air hole is located at the center of the optical fiber section. The special-shaped air hole in this embodiment is composed of four air holes, of which the first air hole with a...

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Abstract

The invention discloses a special-shaped air hole-assisted multi-core few-mode optical fiber, and belongs to the technical field of optical fiber communication. The special-shaped air hole-assisted multi-core few-mode optical fiber comprises a special-shaped air hole, a wrapping layer and a few-mode fiber core; the special-shaped air hole is located in the center of the section of the whole special-shaped air hole-assisted multi-core few-mode optical fiber, and the special-shaped air hole is composed of a first air hole and a plurality of second air holes evenly distributed in the periphery of the first air hole. The wrapping layer is arranged on the periphery of the special-shaped air hole, few-mode fiber cores are evenly distributed in the wrapping layer, and a few-mode optical fiber is arranged between every two adjacent second air holes. According to the special-shaped air hole-assisted multi-core few-mode optical fiber, the refractive index of the special-shaped air hole formed around the few-mode fiber core is lower than that of the wrapping layer, and the special-shaped air hole has certain binding capacity on light, so that optical coupling between the fiber cores is reduced, and crosstalk is restrained to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and relates to a multi-core few-mode optical fiber assisted by special-shaped air holes. Background technique [0002] With the continuous development of the new generation of mobile communication technology, the demand for optical fiber communication capacity continues to increase. In optical fiber communication, technical means such as time division multiplexing, wavelength division multiplexing, and polarization multiplexing can effectively expand transmission capacity, but due to the rapid growth of data services, single-mode optical fibers cannot meet capacity requirements. Among them, time-division multiplexing and wavelength-division multiplexing have been used in the early stages of the development of optical fiber communications, because transmission is still carried out in single-mode optical fibers, and cannot break through the Shannon theoretical limit of single-mo...

Claims

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Application Information

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IPC IPC(8): G02B6/02
CPCG02B6/02042G02B6/02314G02B6/02019
Inventor 程同蕾梁恩旺梁永泽张函汪国瑞张继伟闫欣王方张学楠
Owner NORTHEASTERN UNIV
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