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Vortex optical fiber on basis of linear refractive index distribution and preparation method thereof

A technology of refractive index distribution and refractive index, which is applied in the direction of cladding optical fiber, glass manufacturing equipment, manufacturing tools, etc., can solve the problem of destroying the orbital angular momentum mode, etc., and achieve the effect of simple preparation and good space flexibility

Active Publication Date: 2014-08-06
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, mode coupling in fibers destroys the OAM modes, leading to multipath interference

Method used

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  • Vortex optical fiber on basis of linear refractive index distribution and preparation method thereof
  • Vortex optical fiber on basis of linear refractive index distribution and preparation method thereof
  • Vortex optical fiber on basis of linear refractive index distribution and preparation method thereof

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Effect test

preparation example Construction

[0023] The preparation process of the optical fiber can be divided into the following steps (such as Figure 5-Figure 6 ):

[0024] Step 1: If Figure 5 As shown, a section of polarization-maintaining fiber 6 is selected, and the refractive index distribution of the fiber cladding 7 is a constant constant n cl , while the refractive index of the core 8 has a linear distribution (the minimum value is n 1 , with a maximum value of n 2 );

[0025] Step 2: If Figure 6 As shown, one end of the polarization-maintaining optical fiber 6 is fixed with an optical fiber clamp 9, and a vertical load 10 is applied to the other end to keep the polarization-maintaining optical fiber 6 in a vertical state;

[0026] Step 3: heating the fixed polarization-maintaining optical fiber 6, and applying an axial torsional force 12 when the optical fiber in the heated area 11 is in a molten state;

[0027] Step 4: stop heating, and obtain the vortex optical fiber 13 after the optical fiber in th...

Embodiment 1

[0030] 1. Optical fiber preparation: the vortex optical fiber 13 is prepared according to the optical fiber preparation method of the first embodiment;

[0031] 2. Light source coupling: cut the prepared vortex optical fiber 13, and then align and weld it with the single-mode optical fiber 15 with the light source pigtail, such as Figure 8 shown;

[0032] 3. Generation of vortex beam: After inputting laser light 16, vortex optical mode transmission will be realized in vortex optical fiber 13, and a quasi-vortex beam can be output at the fiber end.

Embodiment 2

[0034] The vortex optical fiber 13 in embodiment 1 can be replaced by the vortex optical fiber 17 that the pitch of the refractive index distribution helical curve changes, as Figure 9 .

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Abstract

The invention discloses a vortex optical fiber formed by fiber cores on basis of linear refractive index distribution and a preparation method thereof. The vortex optical fiber is formed by fiber cores in linear refractive index distribution in a hot melting and twisting mode, and the refractive indexes of the fiber cores of the optical fiber are in linear distribution in the transverse direction and are in helical curve distribution in the longitudinal direction. Because of refractive index distribution, conduction optical waves can form radial phase differences, optical waves transmitted in the optical fiber can obtain orbital angular momentum, meanwhile vortex transmission is formed on light intensity and phase positions, and a vortex-like optical transmission mode is formed. The whole optical fiber has the advantages of being tiny in structure, flexible in operation, stable in system, high in antijamming capability and the like, and can be used for light beam generation, particle control, sensing application and other aspects.

Description

(1) Technical field [0001] The invention relates to an optical fiber and its preparation technology, in particular to a vortex optical fiber based on linear refractive index distribution and its preparation method. (2) Background technology [0002] A remarkable feature of vortex beams is that they have orbital angular momentum (Physical Review A, 1992, 45(11): 8185-8189), so they have been widely studied in recent years and have been widely used in communication, optical tweezers, atom manipulation and microscopy has been greatly applied. The most common way to generate vortex beams is to use spatial light modulators (OpticsExpress, 2008, 16(21): 16984-16992), however, spatial light modulators are generally bulky, expensive, and require optical coupling in free space , which causes a lot of inconvenience. [0003] The optical fiber-based vortex light generator has more advantages in remote interaction and making compact vortex light devices. Researchers have realized the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02C03B37/15
Inventor 苑立波邓洪昌
Owner GUILIN UNIV OF ELECTRONIC TECH
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