High double-refraction photonic crystal fiber (PCF)

A technology of photonic crystal fiber and high birefringence, which is applied in the direction of polarizing fiber, cladding fiber, optical waveguide and light guide, etc., can solve the problem of high nonlinear coefficient, achieve good stability, high birefringence, and small effect of temperature

Inactive Publication Date: 2014-03-05
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiency of low birefringence in the prior art, the present invention proposes a simple and easy-to-fabricate photonic crystal fiber structure with high birefringence characteristics. The structure itself has double rotational symmetry, and can obtain Birefringent photonic crystal fiber has higher birefringence and higher nonlinear coefficient

Method used

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  • High double-refraction photonic crystal fiber (PCF)
  • High double-refraction photonic crystal fiber (PCF)
  • High double-refraction photonic crystal fiber (PCF)

Examples

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Embodiment 1

[0023] A high birefringence photonic crystal fiber with a cross-sectional structure such as figure 1 shown, including core and cladding.

[0024] On the background material (2) of the optical fiber, a group of air hole structures are arranged according to regular grid nodes, among which, the three rows of small circular air holes (3) in the middle are arranged in a square structure, and the small circular air holes (3) on the other sides are arranged in a square structure. Every three adjacent small air holes (3) are arranged in an equilateral triangle structure on the cross-section of the optical fiber; the diameter of the circular small air holes (3) is d.

[0025] The fiber core (1) of the optical fiber is a high-refractive-index core region formed by the absence of two small air holes (3) with a diameter d at the nodes of a regular grid;

[0026] The cladding of the optical fiber is an equivalent low refractive index region formed by the air hole structure on the regular ...

Embodiment 2

[0035] A high birefringence photonic crystal fiber structure, the background material (2) is selected as a polymer material, the diameter of the small air hole (3) in the outer cladding is d=0.588 μm, and the diameter of the large air hole (4) in the inner cladding is D=0.941 μm , the long-axis diameter of the elliptical air hole (5) a=0.588 μm, the short-axis diameter b=0.294 μm, and the distance between the air holes Λ=1 μm.

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Abstract

The invention discloses a high double-refraction photonic crystal fiber (PCF) comprising a fiber core and a cladding. Two small air holes are removed from the central part of an optical fiber so that an ellipse-like fiber core is formed; meanwhile, the structural arrangement of the air holes of the cladding is changed, and four pairs of large air holes and a pair of elliptic air holes are introduced to the cladding and connected to the fiber core, so that the optical fiber with the structure has double rotation symmetry, a cross-polarization mode is not degenerated again, and very high double-refraction is shown. Through changing the structure of the fiber core and adjusting the diameters of the large air holes and the ellipticities of the elliptic air holes within a certain range, the PCF is two orders of magnitudes higher than a common optical fiber due to the adoption of the mode of double refraction, and meanwhile, the optical fiber has a high nonlinear coefficient. The PCF provided by the invention has the advantages of simple structure, high double-refraction and high nonlinearity. The PCF with the structure can be used for manufacturing a polarization-preserving optical fiber and relevant optical fiber devices with proper nonlinearity or polarization characteristics.

Description

technical field [0001] The invention belongs to the field of optical fiber technology, in particular to a photonic crystal optical fiber. Background technique [0002] In an ideal situation, a single-mode fiber transmits two mutually orthogonal modes, which have the same propagation constant and are degenerate with each other, so they can be regarded as a single polarization electric vector. However, the actual optical fiber is somewhat imperfect, and the internal refractive index distribution is also uneven due to the uneven internal stress. This causes the change of the propagation constants of the two fundamental modes, which leads to the disturbance of the polarization state of the fundamental mode in the single-mode fiber, destroys the mutual degeneracy of the fundamental modes, and thus causes the mode birefringence. The polarization-maintaining fiber artificially introduces geometric anisotropy in the cross-section of the fiber, which reduces the coupling coefficient...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/024G02B6/036G02B6/02
Inventor 曹晔李荣敏童峥嵘
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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