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Hollow-core microstructure optical fiber with angular mode selectivity

A micro-structure optical fiber, selective technology, applied in cladding optical fiber, light guide, optics, etc., can solve the problems of complex preparation process and large loss

Active Publication Date: 2021-05-28
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to meet the requirements of the mode purity in the hollow-core optical fiber in the fields of low time delay, high stability optical information transmission, high-precision optical fiber gyroscope and interference sensing, while the existing reported schemes have large loss , complex preparation process and other shortcomings, a hollow core microstructured optical fiber with angular mode selectivity is proposed

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  • Hollow-core microstructure optical fiber with angular mode selectivity
  • Hollow-core microstructure optical fiber with angular mode selectivity
  • Hollow-core microstructure optical fiber with angular mode selectivity

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Embodiment 1

[0018] The cross-sectional structure of the optical fiber in this example is as figure 1 As shown, the matrix material 1 is included, the cladding is composed of rounded hexagonal air holes 2 on the matrix material according to the hexagonal periodic arrangement to form a hexagonal cladding structure, and the core area is a large air hole 3 . The cladding contains twelve symmetry axes with an angle of 30° to each other. The size of the air holes whose centers fall on these 12 symmetry axes in the cladding is larger or smaller than the air holes in other positions at the same time, or partially enlarged The other part shrunk, but kept the same shape.

[0019] The partially enlarged figure of the cross-section of the optical fiber in the present invention is as figure 2 As shown, in this example, various parameters are set as Λ=5μm, d=0.98Λ, d 1 =0.96Λ,d 2 =0.96Λ,t core = 370nm. The fiber matrix material is quartz, and its refractive index is 1.444 at 1550nm. The air core...

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Abstract

The invention discloses a hollow-core microstructure optical fiber with angular mode selectivity, and belongs to the technical field of optical fiber optics and application thereof. The hollow-core microstructure optical fiber includes a matrix material (1), a wrapping layer formed by arranging rounded hexagonal air holes (2) in the matrix material in a hexagonal periodic mode, and large air holes (3) in a fiber core area. The size of the large air hole in the fiber core area is equal to the size of an area formed by one air hole in the wrapping layer and two to four layers of air holes with the air hole as the center. The wrapping layer comprises twelve symmetry axes which form an angle of 30 degrees, the sizes of wrapping layer air holes of which the centers fall on the twelve symmetry axes are larger or smaller than those of air holes in other positions, but the shapes of the wrapping layer air holes are kept consistent with those of the air holes in other positions. According to the invention, through geometric parameter modulation of specific air holes in 12 radial directions of the wrapping layer, an angular mode selection function is achieved, so that the optical fiber only supports pure-state low-loss transmission of an angular mode in a working wave band.

Description

technical field [0001] The invention belongs to the field of fiber optics and its application, in particular to a hollow-core microstructure optical fiber with angular mode selectivity. Background technique [0002] An optical fiber is an optical waveguide that confines light waves to travel in a finite number of modes. Optical fibers provide excellent system performance in interferometric sensing due to their excellent properties of stably transmitting light waves. Because the application scenarios of optical fibers are very complex, they are often affected by the external environment, such as stress changes, temperature changes, and pressure changes. When the fiber is disturbed, the light waves in different modes in the fiber may break away from the original mode and enter other modes, which is called mode coupling, which will cause the degradation of the light wave signal and affect the performance of the interferometric sensing system. Therefore, the stability of the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/032G02B6/02
CPCG02B6/032G02B6/02342
Inventor 刘艳格郭慧毅王志陈亮刘波张昊
Owner NANKAI UNIV
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