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Double core photon crystal optical fiber

A photonic crystal fiber and optical fiber technology, which is applied in optical fiber transmission, optics, light guide, etc., can solve the problems of long polarization splitter and large insertion loss, achieve small insertion loss, shorten device length, and improve network performance.

Inactive Publication Date: 2004-10-06
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the polarization splitters based on this principle are generally longer, and most of the devices are not fiber-optic devices. In practical applications, greater insertion loss may be introduced at the interface between them and the fiber link.

Method used

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  • Double core photon crystal optical fiber
  • Double core photon crystal optical fiber
  • Double core photon crystal optical fiber

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Embodiment Construction

[0024] The working principle of the present invention and various embodiments of this type of optical fiber will be described in detail below with reference to the accompanying drawings.

[0025] The manufacturing method of dual-core photonic crystal fiber is an existing technology, and it is basically similar to the technology of drawing ordinary optical fiber. That is, firstly, the silicon oxide preform is ground into a hexagonal shape, and the center is hollowed out, and then drawn into a hollow capillary with an outer diameter of about 1mm, and then the hollow capillary or solid capillary rods are arranged together according to the designed layout, and the appropriate drawing conditions are adopted. , the capillary will not collapse. Photonic crystal fibers with different cross-sectional structures are realized by adjusting the diameters of the capillary and capillary rods and the wall thickness of the capillary.

[0026] figure 1 Shown is the optical fiber cross-section...

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Abstract

The present invention belongs to the field of fiber communication and optical signal processing, and is especially the design of double core photon crystal optical fiber as one photon device with polarizing split function. The double core photon crystal optical fiber includes one coating layer of low refractive index area formed by pore structure in regular lattice nodes and two high refractive index core areas formed by pore deletion in regular lattice nodes. The present invention features different pore size near the two core areas in two orthogonal polarization directions, unsymmetrical pore deletion, the deflection of the pore center near the core areas to the lattice nodes, or filling of polar material in the pores near the core area. Each of the core areas can produce high double refraction, so that two polarized light beams have great length difference and can be polarizing split in short distance.

Description

technical field [0001] A double-core photonic crystal fiber belongs to the field of optical fiber communication and optical signal processing, and in particular relates to the field of photonic device design of a double-core photonic crystal fiber with polarization splitting function. Background technique [0002] Photonic Crystal Fiber (Photonic Crystal Fiber), also known as microstructure fiber or holey fiber, is a new type of fiber that has attracted widespread attention in recent years. Its cross-section has a relatively complex refractive index distribution. The layer region contains holes in different arrangements that run through the entire fiber. The size of these holes is roughly in the same order of magnitude as the wavelength of the light wave, and the light wave can be restricted to propagate in its core region. [0003] Photonic crystal fibers have many peculiar properties. The arrangement of the holes near the core can greatly affect the mode properties of thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/25
Inventor 杨昌喜张林
Owner TSINGHUA UNIV
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