CN100449338C

CN100449338C - Photonic crystal fiber

Info

Publication number: CN100449338C
Application number: CNB2007100670041A
Authority: CN
Inventors: 郭淑琴; 安文生; 朱广信
Original assignee: Zhejiang University of Technology ZJUT
Current assignee: Zhejiang University of Technology ZJUT
Priority date: 2007-01-30
Filing date: 2007-01-30
Publication date: 2009-01-07
Anticipated expiration: 2027-01-30
Also published as: CN101059584A

Abstract

The invention relates to a photon crystal fiber, which section comprises a core and a clad, wherein the clad covers the core, uniformly distributed with same air holes, the air holes are periodically distributed in the fiber background material, each nearby three air holes are in a right triangle, the core is composed of a round solid material at center and a relative tangent regular polygon hole, the reflective index of the solid material is higher than the fiber background material. The invention improves the core structure of the photon crystal fiber, while the special core composed of the round material in high reflective index and the tangent regular polygon air tube provides ultra-high chromatic aberration effect to the fiber.

Description

Photonic crystal fiber

(1) technical field

The present invention relates to a kind of photonic crystal fiber with the diffusing effect of rich shade.

(2) background technology

Photonic crystal fiber is called porous optical fiber or microstructured optical fibers again.On fiber end face, regularly arranged many airports are elongation vertically in background material, at air aperture of the center of optical fiber disappearance, replace solid background material, perhaps insert the fibre core that refractive index is higher than other material formation leaded light of background material, and the evenly distributed formation covering of peripheral air hole in background material, the optical mode field is limited to high refractivity zone, center substantially, and this type optical fiber is by the total internal reflection principle leaded light.By regulating covering hollow pore opening, pitch of holes size, the size of central entity, the refractive index of central entity, can make photonic crystal fiber have flexile dispersion characteristics.The photonic crystal fiber of design super large dispersion parameters will provide efficient strong indemnifying measure for the chromatic dispersion cross-interference issue on the optical communication line, and huge dispersive optical fiber also might become the substitute of some unstable chromatic dispersion elements in the pulse compression amplifying technique.Big dispersive optical fiber has broad application prospects in optical communication technique and other optical technology.

(3) summary of the invention

The present invention provides the photonic crystal fiber of a kind of features simple structure and the easy super large chromatic dispersion of making in order to solve the difficulty that is difficult to realize at present the super large dispersion parameters in ordinary optic fibre.

For this reason, the present invention takes following technical scheme:

A kind of photonic crystal fiber, the transversal section of optical fiber comprises fibre core and covering, covering is for surrounding the outer peripheral areas that is uniform-distribution with the same structure airport of fibre core, described airport is periodic arrangement in the background material of covering, every three adjacent airports constitute an equilateral triangle, described fibre core is reached by the circular solids material that is positioned at the centre and constitutes jointly with its mutually circumscribed regular polygon hole, and the refractive index of described solid material is higher than the refractive index of the background material of covering.

Regular polygon hole in the described fibre core can be structures such as equilateral triangle, square, regular pentagon.

The background material of described covering is the silex glass material.

The background material of described covering is a polymeric material.

The beneficial effect of photonic crystal fiber of the present invention is mainly reflected in: improve the core structure of photonic crystal fiber, the common special construction fibre core that forms of high index of refraction rounded material and circumscribed regular polygon air hose causes photonic crystal fiber to have the super large effect of dispersion.

(4) description of drawings

Fig. 1 is the cross sectional representation of one embodiment of the invention;

Fig. 2 is the mould field pattern of Fig. 1 example;

Fig. 3 be in Fig. 1 example the photonic crystal fiber dispersion parameters with the wavelength change situation.

Among Fig. 1, the airport in the 1-covering, the background material in the 2-covering, the circular solids material in the 3-fibre core, the equilateral triangle hole mutually circumscribed in the 4-fibre core with the circular solids material.

(5) embodiment

Embodiment one:

With reference to accompanying drawing 1-3, a kind of photonic crystal fiber, end face structure as shown in Figure 1, the background material 2 of covering is quartzy, refractive index is 1.45, the radius of each airport 1 is R=0.46 μ m in the covering, airport 1 is evenly distributed in background material 2 according to the generally acknowledged triangle rule in present technique field in the covering, the spacing of adjacent vacant pore is Λ=2.3 μ m, fibre core is the circular solids material 3 of n=1.9 by refractive index and forms jointly with its mutually circumscribed equilateral triangle hole 4 that the mould field distribution as shown in Figure 2.This photonic crystal fiber has extremely strong effect of dispersion, and its dispersion parameters has dispersion parameters up to-3234ps/nm/km at 1.55 mum wavelengths.

Embodiment two:

On the center of fiber end face, high index of refraction circular solids material reaches and forms fiber core jointly with its mutually circumscribed square air hose.

Embodiment three:

On the center of fiber end face, high index of refraction circular solids material reaches and forms fiber core jointly with its mutually circumscribed regular pentagon air hose.

Claims

1. photonic crystal fiber, the transversal section of optical fiber comprises fibre core and covering, covering is for surrounding the outer peripheral areas that is uniform-distribution with the same structure airport of fibre core, described airport is periodic arrangement in the background material of covering, every three adjacent airports constitute an equilateral triangle, it is characterized in that, described fibre core is reached by the circular solids material that is positioned at the centre and constitutes jointly with its mutually circumscribed regular polygon hole, and the refractive index of described solid material is higher than the refractive index of the background material of covering.

2. photonic crystal fiber as claimed in claim 1 is characterized in that the regular polygon hole is the equilateral triangle structure in the described fibre core.

3. photonic crystal fiber as claimed in claim 1 is characterized in that the regular polygon hole is a square structure in the described fibre core.

4. photonic crystal fiber as claimed in claim 1 is characterized in that the regular polygon hole is the regular pentagon structure in the described fibre core.

5. as the described photonic crystal fiber of one of claim 1-4, the background material that it is characterized in that covering is the silex glass material.

6. as the described photonic crystal fiber of one of claim 1-4, the background material that it is characterized in that covering is a polymeric material.