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Octagonal photonic crystal optical-fiber polarization beam splitter

A technology of photonic crystal fiber and polarization beam splitter, which is applied in the direction of polarization fiber, cladding fiber, light guide, etc., can solve the problems of complex manufacturing process, low birefringence, and low working performance, and achieve high birefringence effect and high extinction Compared with the effect of improving the distribution method

Inactive Publication Date: 2015-12-02
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide an octagonal dual-core photonic crystal with novel and simple structure, excellent performance and easy fabrication in order to overcome the disadvantages of traditional optical fiber beam splitters, such as relatively complicated manufacturing process, low birefringence and low working performance. Fiber Polarization Beam Splitter

Method used

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  • Octagonal photonic crystal optical-fiber polarization beam splitter
  • Octagonal photonic crystal optical-fiber polarization beam splitter
  • Octagonal photonic crystal optical-fiber polarization beam splitter

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Embodiment 1

[0018] refer to figure 1 , an octagonal photonic crystal fiber polarization beam splitter, many air holes are regularly arranged along the axis of the fiber, the air holes are arranged in parallel along the axis of the fiber, and the cross-section is an octagonal structure, such as figure 1 As shown, the background material 1 is silica glass with a refractive index of 1.45.

[0019] The cross-section of the beam splitter includes a double core 3 and a cladding, and the double core 3 is a high-refractive index core area formed by the absence of two circular air holes 2 centered on regular grid nodes, figure 1 The dotted line in the middle indicates the approximate range of the core.

[0020] The cladding of the beam splitter is an equivalent low-refractive index region formed by the arrangement of air holes 2 on the regular grid nodes of the background material 1, and the air holes are distributed in a regular octagon, located at the core 3 around.

[0021] The cladding is c...

Embodiment 2

[0026] An octagonal photonic crystal fiber polarization beam splitter, the cross-section of the beam splitter is octagonal, the cladding air holes are distributed in a combination of octagonal and rectangular, and the background material of the beam splitter is polymer or Soft glass material, other structures and data parameters are the same as in Embodiment 1.

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Abstract

The invention relates to an octagonal photonic crystal optical-fiber polarization beam splitter. The octagonal photonic crystal optical-fiber polarization beam splitter comprises two fiber cores which are distributed in a central symmetry manner and a cladding layer, wherein the cladding layer is formed by circular air holes and a background material, the cladding layer is arranged in a peripheral area of the fiber cores, and the refractive index of the cladding layer is lower than that of the fiber core part; the circular air holes forming the cladding layer are distributed in an octagonal shape surrounding the fiber cores, an elliptical air hole is formed between the two fiber cores, and on the end surface of the photonic crystal optical-fiber polarization beam splitter, all the circular air holes are identical in bore diameters. The octagonal photonic crystal optical-fiber polarization beam splitter has the advantages that the distribution way of the air holes in the optical-fiber cladding layer is improved, so that the asymmetry of the structure is improved, and the optical fibers have high double refractive effect. Meanwhile, the photonic crystal optical-fiber polarization beam splitter has the advantages of high extinction ratio, large bandwidth and the like.

Description

technical field [0001] The invention belongs to the field of optical devices, and relates to an octagonal double-core photonic crystal fiber polarization beam splitter with high birefringence. Background technique [0002] According to the mode coupling theory, when a light wave is incident on a core of a dual-core photonic crystal fiber, a fundamental mode field will be excited in it, and the fundamental mode field of the core will inevitably partially expand into the cladding due to the structural characteristics of the fiber. , so as to enter another fiber core that is very close, this part of the light energy becomes the excitation source of the other fiber core and excites the transmission mode in it. In this way, the mode fields in the two cores can be coupled to each other. As a result, the fundamental mode field in the dual-core structure is composed of four polarization components, namely, the odd and even modes of X polarization, and the odd and even modes of Y pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/024G02B6/032
CPCG02B6/024G02B6/032
Inventor 郝锐
Owner YANSHAN UNIV
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