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Photon crystal optical fibre polarization-maintaining beam splitter

A technology of photonic crystal fiber and beam splitter, which is applied in cladding fiber, optical waveguide and light guide, etc., can solve the problems of large volume size, light splitting performance is greatly affected by environmental factors, etc., and achieve small structure size, excellent polarization maintaining performance, Easy to Design Effects

Inactive Publication Date: 2008-02-13
ZHEJIANG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a photonic crystal fiber polarization-maintaining beam splitter in order to overcome the shortcomings of the existing tapered optical fiber beam splitter with large volume and light splitting performance greatly affected by environmental factors

Method used

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  • Photon crystal optical fibre polarization-maintaining beam splitter
  • Photon crystal optical fibre polarization-maintaining beam splitter

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Embodiment Construction

[0014] The present invention is based on the coupling characteristics of the photonic crystal fiber, adopts the solid core PCF with the core defect as the medium, and utilizes the total internal reflection light guiding mechanism to form a double-core PCF as shown in Figure 1, and the cladding is a square dielectric rod 1 periodical Arranged in the background medium 2, the diameter of the dielectric rod is d, the hole distance is Λ, and the core is a defect that the removal of the dielectric rod destroys the two-dimensional periodic structure, that is, the position of the core dielectric rod is replaced by the background medium. The distance between the two cores is 3Λ, and they are separated by two dielectric rods. We use the parameter hole distance Λ and the relative hole diameter d / Λ to characterize the structure of PCF. When light is incident on one core of the dual-core PCF, as the propagation distance increases, the light energy is gradually coupled into the other core un...

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Abstract

The invention discloses a photonic crystal fiber polarization beam splitter provided with a two-dimensional periodical structure of photonic crystal fiber. The periodical structure is constituted by a background medium and periodically distributed dielectric rods arranged in the medium; the cross section is a parallelepiped; a periodically arranged defect area without single dielectric rod in the background medium is a waveguide core. The advantages of the photonic crystal fiber polarization beam splitter are: easy to achieve stable isophotal power or a certain percentage of splitting ratio, small structural size, not vulnerable to the impact of environmental conditions, small light loss, good polarization of polarized coupling and easy to design. The invention can select different coupling length through structural adjustment to achieve splitting ratio regulation and splitting function.

Description

technical field [0001] The invention relates to a photonic crystal fiber polarization-maintaining beam splitter. Based on the coupling characteristics of the photonic crystal fiber, it can realize 1×N light beam splitting and maintain the polarization of input light. Background technique [0002] Photonic crystal fiber (PCF, photonic crystal fiber) is a new type of optical waveguide developed based on photonic crystal technology. It is composed of a single medium (usually fused silica or polymer), and it runs through the fiber with air holes that are periodically arranged closely in the two-dimensional direction and keep substantially constant in the third dimension (the axis of the fiber). The full length constitutes the microstructure cladding. A defect region in the form of a periodic regular arrangement lacking a single air hole acts as a waveguide fiber core, and the types of defects include air defects and dielectric defects. Therefore, PCF can be regarded as a two-d...

Claims

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Application Information

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IPC IPC(8): G02B6/02
Inventor 陈侃黄腾超舒晓武刘承
Owner ZHEJIANG UNIV
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