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Double negative curvature anti-resonance hollow-core optical fiber and preparation method thereof

A technology of hollow core fiber and anti-resonance, which is applied in the direction of glass fiber, cladding fiber, glass manufacturing equipment, etc. Problems such as insufficient use of boundary advantages, etc., to achieve the effect of being suitable for mass production, excellent structural symmetry, and good structural symmetry

Active Publication Date: 2019-10-15
EZHOU INST OF IND TECH HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above defects or improvement needs of the prior art, the present invention provides a double negative curvature anti-resonance hollow-core fiber and its preparation method, the purpose of which is to solve the problem of the small curvature radius of the anti-resonance negative-curvature hollow-core fiber in the prior art. The advantages of the fiber core boundary are not fully utilized, the high-order mode loss ratio is low, the uniformity of the non-contact tube ring structure cannot be guaranteed, and the technical problems of the multi-layer anti-resonant structure are difficult to prepare

Method used

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  • Double negative curvature anti-resonance hollow-core optical fiber and preparation method thereof
  • Double negative curvature anti-resonance hollow-core optical fiber and preparation method thereof
  • Double negative curvature anti-resonance hollow-core optical fiber and preparation method thereof

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preparation example Construction

[0052] The present invention also provides a method for preparing a double negative curvature anti-resonant hollow-core optical fiber. The steps of the preparation method are as follows:

[0053] S1, capillary drawing: use the first glass tube to draw capillaries of two different radii, wherein, the number of capillaries of two different radii is the same and is multiple;

[0054] S2, preform assembly: use the second glass tube as the outer sleeve 6, draw one end of the outer sleeve 6 into a tapered shape, and then put capillaries of two different radii into the outer sleeve 6 in a staggered manner, wherein the capillary with a larger radius 4 close to the outer tube 6, the capillary 5 with a small radius is close to the capillary 4 with a large radius, and the capillary 5 with a small radius is closer to the center of the outer tube 6 than the capillary 4 with a large radius;

[0055] Two capillary rods of different lengths are used as the central mould, wherein the short cap...

Embodiment 1

[0064] A double negative curvature anti-resonant hollow-core fiber, comprising a cladding region and a core region, the cladding region sequentially includes an outer cladding 1, a first anti-resonant layer and a second anti-resonant layer from outside to inside, wherein the first anti-resonant The resonant layer includes a plurality of rotationally symmetrically distributed first capillaries 2 and the first antiresonant layer is tangent to the outer cladding 1; the second antiresonant layer includes a plurality of rotationally symmetrically distributed second capillaries 3, and the second capillary 3 is connected to the first The capillaries 2 are tangential and staggered, the second anti-resonance layer is closer to the center line of the optical fiber than the first anti-resonance layer, and the irregular area surrounded by the boundary between the first anti-resonance layer and the second anti-resonance layer is In the core area with double negative curvature, the number of...

Embodiment 2

[0066] A method for preparing a double negative curvature antiresonant hollow-core optical fiber, comprising the following steps:

[0067] (1) Capillary drawing:

[0068] Use the first glass tube with a wall thickness of Φ50mm and a thickness of 2.5mm to draw capillaries of two different radii, both of which are 6 in number. , at a drawing furnace temperature of 1980°C, when drawing capillary tubes of two specifications, the internal pressures of the glass tubes were set to 2mabr and 5mbar respectively.

[0069] (2) Preform assembly:

[0070] Use a second glass tube with a wall thickness of Φ40mm and a wall thickness of 7.75mm and a length of 1000mm as the outer casing 6, draw one end of the outer casing 6 into a tapered shape, and the diameter of the inner hole at the tapered end is less than 5mm. Put the drawn capillaries of two different radii into the outer casing 6 in a staggered arrangement, wherein the capillary 4 with the larger radius is close to the outer casing 6,...

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Abstract

The invention discloses a double negative curvature anti-resonance hollow-core optical fiber. The optical fiber comprises a cladding region and a fiber core region, the cladding region sequentially comprises an outer cladding, a first anti-resonance layer and a second anti-resonance layer from outside to inside, wherein the first anti-resonance layer comprises multiple rotatably and symmetricallydistributed first capillaries, and the first anti-resonance layer is tangent to the outer cladding; the second anti-resonance layer comprises multiple rotatably and symmetrically distributed second capillaries, the second capillaries and the first capillaries are tangent to each other and in staggered arrangement, and the radiuses of the second capillaries are smaller than the radiuses of the first capillaries; and the second anti-resonance layer is closer to a center line of the optical fiber compared with the first anti-resonance layer, and an irregular region surrounded by boundaries of thefirst anti-resonance layer and the second anti-resonance layer is namely the fiber core region. The invention aims at solving the technical problems that small curvature radius boundary advantage ofan anti-resonance negative curvature hollow-core optical fiber is not fully played, a high order mode loss ratio is low, structural uniformity can not be guaranteed and anti-resonance structure preparation difficulty is high in the prior art.

Description

technical field [0001] The invention belongs to the field of optical fibers, and more specifically relates to a double negative curvature anti-resonant hollow-core optical fiber and a preparation method thereof. Background technique [0002] Due to the inherent defects of the core silica matrix material, such as nonlinearity, dispersion, light-induced damage, ultraviolet, mid-infrared, etc., the solid-core optical fiber widely used at present limits the communication data transmission of the solid-core optical fiber, and the high-power short-pulse laser Transmission, applications in ultraviolet, mid-infrared, terahertz, microwave transmission and other fields. Due to its extremely small nonlinearity, low modal dispersion, high damage threshold, wide transmission band and transmission speed close to the speed of light, the hollow core fiber is expected to break through the bottleneck of the existing solid core fiber. [0003] Hollow-core fibers include photonic bandgap fiber...

Claims

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Application Information

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IPC IPC(8): G02B6/02C03B37/027
CPCG02B6/02304G02B6/02328G02B6/02395C03B37/02781
Inventor 李进延陈翔刑颖滨
Owner EZHOU INST OF IND TECH HUAZHONG UNIV OF SCI & TECH
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