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Square lattice slow light photonic band gap optical fiber

A square lattice and photonic bandgap technology, applied in cladding optical fiber, optical waveguide, light guide, etc., can solve the problems of complex process, inconvenient use, no slow light effect, etc., and achieve a wide range of refractive index, wide bandwidth, Effects that are easy to mass produce

Inactive Publication Date: 2015-04-08
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) People usually need to use materials with a refractive index ratio greater than 3.4:1 to make a complete photonic bandgap, but the process of making a complete photonic bandgap with a material with a refractive index ratio greater than 3.4:1 is more complicated and inconvenient for people to use
[0005] (2) The cladding bandgap of the commonly used photonic bandgap fiber appears at the place where the propagation constant is greater than zero, so there is no slow light effect

Method used

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  • Square lattice slow light photonic band gap optical fiber
  • Square lattice slow light photonic band gap optical fiber
  • Square lattice slow light photonic band gap optical fiber

Examples

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Embodiment 1

[0036] Embodiment 1, the annular column is a solid circular column, that is, the inner radius is 0, the material A (annular column and connecting rod) is a chalcogenide compound with a refractive index of 2.8, the fiber core is made of air, and the middle 4 pieces of the fiber core are removed After solid circular posts and connecting rods, a hollow fiber optic is formed.

[0037] The parameters of the optical fiber in Example 1 are: the outer radius of the annular column is 0.33a, and the width of the connecting rod is 0.1a, where a is the period of the square lattice; the actual value of a is determined according to the target frequency, and is determined by the normalized frequency Values ​​can be converted.

[0038] When the propagation constant is zero, the normalized complete bandgap width of the cladding periodic structure is 7.36%. see Figure 4 As shown, there are 2 slow guided modes starting from the normalized propagation constant of zero in the middle of the band...

Embodiment 2

[0039] Embodiment 2, the annular column is a hollow circular column, that is, the inner radius is non-zero, the material A (annular column and connecting rod) is a chalcogenide compound with a refractive index of 2.8, the fiber core is made of air, and the middle 1 is removed from the fiber core After a hollow circular column and a connecting rod, a hollow optical fiber is formed.

[0040]The parameters of the optical fiber in Example 2 are: the width D of the connecting rod is 0.05a; the outer radius of the annular column is D·sqrt(2)+0.29a, the inner radius is 0.14a, and sqrt represents the square root calculation.

[0041] When the propagation constant is zero, the normalized complete bandgap width of the cladding periodic structure is 13.45%. see Figure 5 As shown, there are two guided mode dispersion curves in the middle of the band gap, but only the dispersion curve of the upper guided mode extends from the normalized propagation constant to zero, and the dispersion cu...

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Abstract

The invention discloses a square lattice slow light photonic band gap optical fiber and relates to the field of photonic band gap optical fibers. The optical fiber comprises a fiber core and a wrapping layer. The wrapping layer is an enclosed area formed by a plurality of square lattice periodic structures. The fire core is a defect area missed from the center of the enclosed area. Each square lattice periodic structure is made of a material A with the refraction rate larger than 2.24 and a material B with the refraction rate of 1-1.5, and A / B>2.24. The fire core is made of a material with the refraction rate larger than 1. Annular columns are arranged at the positions of four corners of the square lattice periodic structure, the adjacent annular columns are connected through a connection rod, and the annular columns and the connection rods are both made of the material A. The outer portion radius of the annular columns is 0.2-0.45a, and the inner portion radius is 0-0.27a. The width of the connection rods is smaller than 0.22a. The optical fiber is made of the material easy to pull, is easy to produce in a large scale, low in cost, convenient to use and wide in application.

Description

technical field [0001] The invention relates to the field of photonic bandgap fibers, in particular to a square lattice slow-light photonic bandgap fiber. Background technique [0002] A photonic bandgap fiber includes a core and a cladding: the cladding refers to the periodic structure surrounding the core, and the core refers to the central region of the fiber, consisting of one or more periodic structures that are damaged or missing. When the photonic band gap fiber is obtained, the material composition, shape and size of the fiber cladding periodic structure are changed. When the propagation constant is zero, the cladding of the photonic bandgap fiber of the present invention has a complete bandgap, and the partial transmission mode in the photonic bandgap fiber has a low transmission group velocity, that is, the group refractive index of the photonic bandgap fiber is higher than that of the composition The refractive index of the material of the medium of the optical f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02
CPCG02B6/02328
Inventor 侯金
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES