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Panda type high double-refraction photon crystal fiber

A technology of photonic crystal fiber and high birefringence, which is applied in cladding fiber, optical waveguide and light guide, etc., can solve the problems of large numerical aperture, etc., and achieve the effect of large numerical aperture, small temperature influence and good stability

Inactive Publication Date: 2008-06-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency of low birefringence in the prior art, the present invention proposes a photonic crystal fiber structure with high birefringence characteristics that is simple in structure and easy to manufacture. The structure itself has double rotational symmetry, and can obtain Birefringent photonic crystal fiber has higher birefringence and maintains single-mode transmission in a wide wavelength range, with low limiting loss, large numerical aperture, and adjustable dispersion characteristics

Method used

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  • Panda type high double-refraction photon crystal fiber
  • Panda type high double-refraction photon crystal fiber

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Embodiment 1

[0018] A panda-like photonic crystal fiber, the end face structure is shown in Figure 1, including a core and a cladding. The core 1 of the optical fiber is composed of a radius d 1 The absence of small air holes 3 forms a high-refractive index core region, and the cladding of the optical fiber is an equivalent low-refractive index region formed by air hole structures on regular grid nodes. The cladding is composed of an inner cladding and an outer cladding, and is located around the core 1 . The outer cladding consists of regularly arranged diameters d in the background material 2 1 The small air hole 3 and the surrounding background material constitute. The three adjacent small air holes (two horizontal air holes and one vertical air hole 3) are arranged in an isosceles triangle as shown in Figure 2, and the vertex angle θ of the isosceles triangle is greater than 60 degrees and less than 120 degrees (60° 2 The large air hole 4 and the surrounding background material cons...

Embodiment 2

[0025] A panda-like photonic crystal fiber structure, the background material 2 is selected as a polymer material, and the diameter of the large air hole 4 in the inner cladding is d 2 =2.8μm, the diameter d of the small air hole 3 in the outer cladding 1 =0.8 μm, the apex angle θ=96° of the isosceles triangle formed by the small air hole 3, the small air hole 3 and the lateral spacing Λ=2 μm of the small air hole 3 and the large air hole 4, a pair of large air hole 4 The pitch is 2Λ=4μm.

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Abstract

The invention discloses a panda-liked high birefringence photonic crystal fiber. A pair of large air holes are respectively replaced with seven small air holes; and the transverse space among the cladding air holes is different from the horizontal space among the cladding air hole; therefore, the structural fiber has duplicate rotational symmetry; the orthogonally polarizing mode is no longer degenerated, which appears high birefringence. The panda like type of high birefringence photonic crystal fiber can maintain single mode transmission within a wide wavelength range; the birefringence of the mode is one order of magnitude higher than the birefringence of the common fiber at least. The structural fiber has low restriction consumption, large numerical aperture and adjustable dispersion. Therefore, the PCF with the structure can be used for the manufacture of the polarization maintaining fiber and the related fiber device, which are provided with suitable dispersion and polarization characteristics. The invention has very small temperature influence and good stability.

Description

technical field [0001] The invention relates 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, there are some imperfections in the actual optical fiber, such as the ellipticity of the core, internal residual stress, etc. At this time, a linearly polarized light input into the fiber will also be decomposed into two polarized lights whose vibration directions are orthogonal to each other in the fiber. In addition to their different field shapes and ideal modes, their propagation constants are also different, so that it is easy to cause coupling between two mutually orthogonal modes, which is mainly manifested in the fact that the total polarization of the two orthogonal po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02
Inventor 赵建林张晓娟杨德兴侯建平
Owner NORTHWESTERN POLYTECHNICAL UNIV
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