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Vector light field regulation and control optical fiber based on nanometer grating array

A nano-grating and vector light field technology, applied in the direction of grating fiber, cladding fiber, optical waveguide light guide, etc., can solve the problems of multiple vector light field mode coupling crosstalk, etc., and achieve small size, high stability and compact structure Effect

Inactive Publication Date: 2018-05-29
SHANGHAI UNIV
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  • Abstract
  • Description
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Problems solved by technology

But the vector mode degeneracy in the fiber will cause multiple vector light field mode coupling and crosstalk
For example, the high-order linearly polarized mode field LP transmitted in the fiber 11 It is formed by the degeneracy of four intrinsic cylinder vector modes with close transmission constants, that is, TM 01 , TE 01 , HE 21 o / e modes, which correspond to the radial polarization, angular polarization and mixed-state polarization beams of the cylindrical vector light field respectively. There is crosstalk between the four modes, but because their transmission constants and effective refractive indices are very close, it is difficult for general devices and methods to separate them separate

Method used

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  • Vector light field regulation and control optical fiber based on nanometer grating array
  • Vector light field regulation and control optical fiber based on nanometer grating array
  • Vector light field regulation and control optical fiber based on nanometer grating array

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Embodiment 1

[0029] Embodiment one: see attached figure 1 , the present invention is based on a nano-grating array vector light field control optical fiber, including an optical fiber (3), characterized in that: the optical fiber (3) includes a fiber core (2) and a nano-grating array implanted near the core ( 1).

Embodiment 2

[0030] Embodiment 2: This embodiment is basically the same as Embodiment 1, and the special features are as follows: the optical fiber (3) is a few-mode optical fiber, or a multi-mode optical fiber, or a hollow-core optical fiber, or a polarization-maintaining optical fiber, or a ring optical fiber, Or rare earth doped fiber, or large mode field fiber, or double-clad fiber, or photonic crystal structure fiber. The nano-grating array (1) is a sub-wavelength periodic structure induced and formed inside the optical fiber (3) by femtosecond laser direct writing technology, and its period, grating arrangement direction, birefringence intensity characteristics and scattering characteristics are passed through femtosecond Laser parameters and direct write process parameters for precise control. The normal line of the grating surface of the nano-grating array (1) is perpendicular to the direction of the fiber core (2). The nano grating array (1) is distributed in the cladding around ...

Embodiment 3

[0031] Embodiment three: see attached image 3 , which shows the device diagram of the present invention based on vector light field control fiber combined with high-order mode generator to output vector light field. Laser light source (1'), high-order mode generator (2') and optical fiber with vector light field control function (3') are used which are fused in sequence.

[0032] The laser light source (1') is a semiconductor laser with adjustable power, or a solid-state laser, or a fiber laser. It is broadband, or narrow linewidth. It can be continuous, or pulsed.

[0033] The optical fiber (3') with vector light field control function is formed by directly writing nano-grating arrays in the optical fiber with femtosecond laser pulses, see the attached figure 1 . The specific manufacturing process is as follows: straighten the optical fiber and fix the two ends with a rotatable clamp, and place it on a femtosecond laser three-dimensional precision processing platform. ...

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Abstract

The invention relates to a vector light field regulation and control optical fiber based on a nanometer grating array. In the optical fiber, a femtosecond laser direct writing technology is used to implant the nanometer grating array in an internal portion; and through specific array configuration, unique corresponding vector mode of light is selected to pass through. If grating surface distribution of the nanometer grating array is a radiation type, a radial polarization vector light field can be correspondingly regulated, controlled and output, which is a TM01 model. If grating surface distribution of the nanometer grating array is an annular type, an angular polarization vector light field can be correspondingly regulated, controlled and output, which is a TE01 model. If grating surfacedistribution of the nanometer grating array is a staggered type, a mixed polarization vector light field can be correspondingly regulated, controlled and output, which is an HE21<o / e> model. And then, vector light field regulation and control in a broadband range can be realized. The structure of the vector light field regulation and control optical fiber is simple, one-time molding is realized,stability is high, and a wide application prospect is possessed in important fields of optical fiber communication, an optical integration, material processing, optical tweezers and the like.

Description

technical field [0001] The invention belongs to the field of vector light field control, and specifically relates to a vector light field control optical fiber based on a nano-grating array, that is, an optical fiber with a vector light field control function implanted with a nano-grating array inside the fiber through femtosecond direct writing technology. Background technique [0002] A vector light field is a light field with a unique spatially non-uniform distribution of polarization states. As one of the important characteristics of light, the polarization state plays an important role in the interaction between light and matter. The vector light field provides flexible and controllable amplitude, phase and polarization state distribution under focusing, and the precise control of the interaction process between the light field and matter enriches the new physics and new effects of the interaction between light and matter. Among them, the cylindrical vector light field...

Claims

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Application Information

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IPC IPC(8): G02B6/02
CPCG02B6/02057G02B6/02076G02B6/02128
Inventor 曾祥龙陆佳峰王腾戴晔李沁庞拂飞王廷云
Owner SHANGHAI UNIV
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