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Photonic crystal fiber with elliptical spiral elliptical hole structure

A technology of photonic crystal fiber and elliptical hole, which is applied in cladding fiber, optical waveguide light guide, light guide, etc., can solve the problems that the spectrum cannot be infinitely broadened, unfavorable supercontinuum spectrum, etc.

Active Publication Date: 2020-04-17
TIANJIN POLYTECHNIC UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These are not conducive to the generation of supercontinuum
Due to the existence of the second ZDW, the frequency shift of the soliton under the Raman effect is limited, and finally reaches a balance, so that the spectrum cannot be infinitely broadened, and the energy is concentrated in a certain frequency band

Method used

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  • Photonic crystal fiber with elliptical spiral elliptical hole structure
  • Photonic crystal fiber with elliptical spiral elliptical hole structure
  • Photonic crystal fiber with elliptical spiral elliptical hole structure

Examples

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Embodiment Construction

[0026] First, the ES-EH PCF calculation model was constructed using silicate soft glass (SF57) as the substrate. Such as figure 1 As shown, ES-EH PCF has 12 helical arms, and each helical arm contains 5 elliptical air holes. Different spiral arms have different bending radians, and the spacing of the elliptical air holes in them is also different. To provide a quantitative design, the structure can be described from another perspective: the ES-EH PCF is constructed of 5 layers of elliptical envelopes (red dotted lines), each layer has 12 elliptical air holes. Note that the ellipticity ratios of the five-layer elliptic envelopes are equal, namely Where B is the major axis of the ellipse envelope, A is the minor axis of the ellipse envelope, and A 1 , A 2 , A 3 , A 4 , A 5 are the minor axis of the ellipse envelope of each layer, B 1 , B 2 , B 3 , B 4 , B 5 are the major axes of the elliptical envelopes of each layer, and the distance between each layer is equal, th...

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Abstract

The invention belongs to the field of design and manufacturing of an optical fiber devices and relates to a photonic crystal fiber with an elliptical spiral elliptical hole structure in order to realize higher birefringence and wider spacing double-zero dispersion wavelength characteristics. The method comprises steps of constructing a substrate by using silicate soft glass, and establishing an elliptical spiral elliptical hole photonic crystal fiber calculation model; carrying out simulation calculation of the optical fiber by using simulation software to obtain a corresponding ideal geometric parameter combination when the birefringence reaches the maximum value; drawing a dispersion characteristic curve and a non-linear characteristic curve under an ideal condition, and obtaining doublezero dispersion points and a high non-linear value in an intermediate infrared region; according to a characteristic curve of the optical fiber under geometrical parameter fluctuation, proving that the structure designed by the patent has high robustness for geometrical parameter deviation in the manufacturing process. The photonic crystal fiber is advantaged in that the designed photonic crystalfiber has high birefringence, high nonlinearity and double-zero dispersion, and can meet application requirements of super-continuum light source generation.

Description

technical field [0001] The invention belongs to the field of design and manufacture of optical fiber devices, and relates to a photonic crystal optical fiber with an elliptical helical elliptical hole structure. Background technique [0002] Photonic Crystal Fiber (PCF) is a type of optical fiber based on the properties of photonic crystals. Conventional optical fibers have a solid cladding with a low refractive index, confining light waves to a high-index core. In a PCF, the microstructure of the fiber core and the presence of surrounding air holes provide the refractive index difference needed to guide light. The basic working principle of PCF is based on total internal reflection or via the photonic bandgap effect. Compared with traditional optical fibers, the cross-sectional configuration of PCF provides greater freedom in the design of various characteristics such as birefringence, dispersion, effective mode field area, and nonlinearity. At present, there have been m...

Claims

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Application Information

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IPC IPC(8): G02B6/02G02B27/00
CPCG02B6/02342G02B27/0012
Inventor 张珊珊方传情刘雪迪
Owner TIANJIN POLYTECHNIC UNIV
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