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Polarizing coupler based on double-core photonic crystal fibers mixed with metal wire

A photonic crystal fiber and metal wire technology, applied in the coupling of optical waveguides, cladding fibers, optical waveguides and other directions, can solve the problem of small birefringence coefficient, etc., and achieve the effect of stable performance and wide working bandwidth

Inactive Publication Date: 2013-07-24
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional photonic crystal fiber coupler, there is a birefringence phenomenon between the polarization component along the direction connecting the two cores and the polarization component perpendicular to the direction connecting the two cores, but the birefringence coefficient is very small and cannot be Separation of two polarization components within a limited distance

Method used

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  • Polarizing coupler based on double-core photonic crystal fibers mixed with metal wire
  • Polarizing coupler based on double-core photonic crystal fibers mixed with metal wire
  • Polarizing coupler based on double-core photonic crystal fibers mixed with metal wire

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Such as figure 1 As shown, take two air holes at the middle position of the photonic crystal fiber with a spacing of D=2Λ, fill the background material 1 to form the first core 4 and the second core 5, in the first core 4 and the second core The air holes between 5 are filled with metal wires 3, the metal material is gold, and the diameter d=1 μm. The diameter of the air holes 2 is d=1 μm, and the distance Λ=2.3 μm. The background material is silica.

[0034] image 3 is the coupling length of the x-polarization component and the y-polarization component in the photonic crystal fiber polarization coupler. from image 3 It can be seen that when the wavelength of the incident light is in the range of 1150nm to 1600nm, the coupling length of the y-polarized component in the coupler is about 1.5 times that of the x-polarized component. When the 45° linearly polarized light is input from the first core 4, it gradually transfers from the first core 4 to the second core 5...

Embodiment 2

[0036] Such as Image 6 As shown, the middle position of the photonic crystal fiber is taken, and the distance is The two air holes are filled with the background material 1 to form the first core 4 and the second core 5, and the metal wire 3 is filled in the two air holes between the first core 4 and the second core 5, and the metal material is Gold, diameter d=1 μm. The diameter of the air holes 2 is d=1 μm, the distance Λ=2.3 μm, and the refractive index n=1. The background material is silica.

[0037] Figure 4 It is the relationship between the normalized intensity of the two fiber cores and the transmission distance during the transmission of light with a wavelength equal to 1550nm in the coupler. When the 45° linearly polarized light is input by the first core 4, the x-polarized component undergoes periodic power transfer in the two cores, and the power attenuates rapidly. After the transmission distance is 2mm, the x-polarized component of the transmitted light is...

Embodiment 3

[0040] Such as Figure 9 As shown, two air holes at the middle position of the photonic crystal fiber with a distance of D=2Λ are taken, and the background material 1 is filled to form the first core 4 and the second core 5 . In the second layer of air holes in the air hole cladding, take two adjacent air holes and fill them with metal wires 3, the metal material is gold, and the diameter d=1 μm. The diameter of the air holes 2 is d=1 μm, and the distance Λ=2.3 μm. The background material is silica.

[0041] After the 45° linearly polarized light is input by the first fiber core 4, two supermodes are formed in the fiber core, that is, the even mode and the odd mode, which are transmitted with different transmission constants. The evanescent field of the supermode in the core is coupled to the two gold wires 3 in the air hole cladding, and the surface plasmons are simultaneously excited on the gold wires 3 . Two surface plasmon modes superimpose to form four mixed modes with...

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Abstract

The invention relates to a polarizing coupler based on double-core photonic crystal fibers mixed with a metal wire. The polarizing coupler based on the double-core photonic crystal fibers mixed with the metal wire is characterized by comprising background materials, cladding, a first fiber core, a second fiber core and the metal wire. The background materials are silica glass materials. Air holes arranged in a regular hexagon structural cycle mode are formed in the background materials to form the cladding. The first fiber core and the second fiber core are symmetrically located on two air hole defects in the center of the cladding. Metal materials are filled in one or two air holes to form the metal wire, wherein the one or two air holes are arbitrarily selected in the cladding. According to the polarizing coupler based on the double-core photonic crystal fibers mixed with the metal wire, the transmissivity of two cross-polarized components and coupling lengths of the two cross-polarized components are different, control over the transmissivity of output light and a polarization state can be achieved, and the functions of polarization separation and polarization filtering are achieved. The polarizing coupler based on the double-core photonic crystal fibers mixed with the metal wire has the advantages of being wide in operating bandwidth, stable in performance and capable of achieving the functions of polarization separation and polarization filtering.

Description

technical field [0001] The invention relates to the field of optical fiber couplers, in particular to a photonic crystal fiber polarization coupler for polarization separation and polarization filtering, which is a polarization coupler based on a double-core photonic crystal fiber doped with metal wires. Background technique [0002] Optical fiber is widely used in the field of communication due to its advantages of low transmission loss, small diameter, light weight, bendability, corrosion resistance, and anti-electromagnetic interference. The all-fiber network composed of it has greater communication capacity, easy maintenance, and reliability. Advantages of high sex. Photonic crystal fiber is a kind of optical fiber with periodic microstructure perpendicular to the direction of beam propagation. This periodic microstructure is usually composed of air holes or high refractive index media. It uses the principle of total reflection or photonic band gap to localize light in t...

Claims

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Application Information

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IPC IPC(8): G02B6/27G02B6/02
Inventor 赵建林李鹏
Owner NORTHWESTERN POLYTECHNICAL UNIV
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