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Photon crystal fiber

A photonic crystal fiber and fiber technology, applied in the directions of light guides, optics, optical components, etc., can solve the problems of insufficient fiber mode field area and limited mode field area increase, so as to reduce nonlinear effects and eliminate gain saturation effects. , the effect of reducing the optical power density

Inactive Publication Date: 2005-06-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcomings of the existing optical fiber that the mode field area is not large enough and the mode field area increase is limited, and to provide a photonic crystal fiber with a sufficiently large mode field area and insensitive mode field area to wavelength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Refer to attached Figure 1-3 , a photonic crystal fiber, comprising a core and a cladding, selecting quartz as the background material 2, the center of the background material is provided with a central hole, and air holes 1 forming the core and cladding surround the central hole in the background material Periodically and uniformly arranged, in which the air holes on the entire fiber end surface are equally spaced, and the core is composed of multiple smaller air holes arranged uniformly in the background material to form a light guide area, which directly defines the area of ​​the single-mode light field. The peripheral area is formed by the uniform arrangement of larger air holes in the background material. Because the duty ratio of the air holes is larger than that of the core area, the refractive index is slightly smaller than that of the core area, forming a cladding. On the entire end face of the optical fiber, a periodic arrangement recognized in the technical ...

Embodiment 2

[0021] Refer to attached Figure 4 , 5 , a photonic crystal fiber, comprising a core and a cladding, a central hole is provided at the center of the background material 2, air holes 1 forming the core and the cladding are periodically and evenly arranged in the background material around the central hole, and the entire optical fiber The size of the air holes on the end surface is equal, the diameter is d=0.46, and the distance between the air holes in the fiber core area is relatively large, Λ 1 =3.45, the spacing of the air holes in the cladding area is small, Λ 2 =2.3, so the air hole duty ratio in the core region is smaller than that of the cladding layer, and the refractive index is slightly larger than that of the cladding layer, forming a light guiding region. Depend on Figure 5 It can be seen that the mode field is basically limited to the core area. When the core area is large, the size of the mode field area is determined by the core area and basically does not c...

Embodiment 3

[0023] The spacing of the air holes on the entire fiber end face is equal, the diameter of the air holes in the core area is slightly smaller than the diameter of the air holes in the cladding, and the duty ratio of the air holes in the core area is slightly smaller than that in the cladding, forming a light guiding area. Each adjacent four air holes form a square arrangement, which also forms a large-mode-field photonic crystal fiber whose mode field is limited within the area of ​​the core. Other conditions are the same as in Example 1.

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Abstract

it is a photon crystal fiber with fiber core and cover layer. The said cover layer is located outside the fiber core with reflection rate lower than the fiber core part. The background center is set with central holes. The air holes around the fiber core and cover layer are distributed evenly in the background materials. The air hole occupy is smaller than the cover area, wherein, the air holes are of same diameter of the fiber core and cover layer; every two adjacent air hole distance of the fiber core is larger than that of cover layer; or every two adjacent air hole distance of the fiber core equals to that of cover layer; the air hole diameter of the fiber hole is smaller than that of the cover layer.

Description

(1) Technical field [0001] The invention relates to a photonic crystal fiber, in particular to a photonic crystal fiber with a large mode field area and insensitive mode field area to wavelength. (2) Background technology [0002] Photonic crystal fiber is also called holey fiber or microstructure fiber. On the fiber end face, many regularly arranged air holes elongate in the axial direction in the background material, and one air hole is missing in the center of the fiber to form a light-guiding fiber core, while the peripheral air holes are uniform in the background material Arranged to form cladding. The refractive index of the core is greater than that of the cladding. This type of photonic crystal fiber guides light through the principle of total internal reflection. The optical mode field is basically limited to the central defect position. Increase the mode field area, but the increase is very limited. If multiple air holes are missing in the center, although the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/00
Inventor 郭淑琴乐孜纯全必胜
Owner ZHEJIANG UNIV OF TECH