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Hollow-core anti-resonance optical fiber with core shift structure

An eccentric structure, anti-resonance technology, applied in the direction of multi-layer core/clad fiber, clad fiber, light guide, etc., can solve the problem of not being able to ensure low bending loss and quasi-single-mode transmission at the same time

Active Publication Date: 2020-06-09
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it solves the problem that low bending loss and quasi-single-mode transmission cannot be guaranteed at the same time in the prior art

Method used

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  • Hollow-core anti-resonance optical fiber with core shift structure
  • Hollow-core anti-resonance optical fiber with core shift structure
  • Hollow-core anti-resonance optical fiber with core shift structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 As shown, a cladding graded eccentric hollow-core antiresonant fiber with 12 thin-walled tubes is shown, in which the ratio of the largest thin-walled ring diameter to the core is 0.65, and the ratio of the smallest thin-walled ring diameter to the core diameter is 0.3. Each thin-walled tube is separated by a distance of 6 wall thicknesses. The core circle is tangent to all thin-walled tubes.

[0034] In this embodiment, the core region may be liquid, gas or vacuum.

[0035] In this embodiment, the high refractive index thin-walled tube and the outer cladding are silicon dioxide, doped glass, photosensitive resin or plastic.

Embodiment 2

[0037] Such as figure 2 As shown, a graded cladding eccentric hollow-core antiresonant fiber with 8 thin-walled tubes is shown, in which the ratio of the largest thin-walled ring diameter to the fiber core is 0.7, and the ratio of the smallest thin-walled ring diameter to the fiber core diameter is 0.45. Each thin-walled tube is separated by a distance of 5 wall thicknesses. The core circle is tangent to all thin-walled tubes.

[0038] In this embodiment, the core region may be liquid, gas or vacuum.

[0039]In this embodiment, the high refractive index thin-walled tube and the outer cladding are silicon dioxide, doped glass, photosensitive resin or plastic.

[0040] Such as image 3 As shown, the figure shows the second embodiment of the present invention-the cladding graded eccentric hollow-core anti-resonant fiber of 8 thin-walled tubes and the traditional symmetrical 8-thin-walled tube and 6-thin-walled tube hollow-core anti-resonant fiber bent Simulation comparison d...

Embodiment 3

[0042] Such as Figure 4 As shown in , a schematic diagram of the structure of the end face of the resonant layer asymmetric eccentric hollow-core anti-resonant fiber is shown. The inner cladding is composed of 6 thin-walled rings with the same diameter, and a resonant layer 5 is added on the side with larger stress along the bending direction, and the thickness difference between the resonant layer and the thin-walled rings is no more than 40%. The resonant layer can consist of nested tubes and connecting tubes.

[0043] In this embodiment, the core region may be liquid, gas or vacuum.

[0044] In this embodiment, the high refractive index thin-walled tube and the outer cladding are silicon dioxide, doped glass, photosensitive resin or plastic.

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Abstract

The invention discloses a hollow-core anti-resonance optical fiber with a core shift structure, and belongs to the technical field of optics and laser photoelectrons. According to the optical fiber, the bending loss of the optical fiber is greatly reduced and the single-mode transmission characteristic of the optical fiber is improved through the design of a left-right asymmetric cladding structure. Compared with traditional total internal reflection type and symmetrical hollow-core anti-resonance optical fibers, the optical fiber of the invention has the advantages of low bending loss, quasi-single-mode transmission, wide transmission spectrum, low dispersion, high damage threshold and the like. Simulation and experiments prove that compared with a traditional single-circle node-free hollow-core anti-resonance optical fiber, the bending loss of the optical fiber is reduced by one order of magnitude under the condition of a small bending radius. And meanwhile, simulation and CCD imaging also prove that the quasi-single-mode transmission characteristic is relatively good. The optical fiber has huge application prospects in optical fiber sensing, optical fiber gas lasers and high-power ultra-short pulse laser transmission.

Description

Technical field: [0001] The invention belongs to the technical fields of optical communication and laser optoelectronics, and in particular relates to an eccentric hollow-core anti-resonant optical fiber with low bending loss characteristics and quasi-single-mode transmission characteristics. Background technique: [0002] Optical fiber technology plays a key role in many fields such as communication, laser, nonlinearity, sensing, quantum, biology, etc., and has greatly promoted the progress of human society. However, with the development of the times, intrinsic defects such as low damage threshold, inability to guide light in the ultraviolet-infrared band, and high nonlinearity of traditional solid-core optical fibers have gradually emerged. Hollow-core photonic crystal fiber creates an ideal optical transmission environment similar to free space with low dispersion, low nonlinearity, low time delay and low loss for light waves in long-distance flexible links, so it has man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02G02B6/036
CPCG02B6/02328G02B6/02347G02B6/03622
Inventor 顾帅娄淑琴盛新志王鑫
Owner BEIJING JIAOTONG UNIV
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