CN103969739B - Vortex optical fiber based on linear refractive index distribution and preparation method thereof - Google Patents
Vortex optical fiber based on linear refractive index distribution and preparation method thereof Download PDFInfo
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- CN103969739B CN103969739B CN201310030067.5A CN201310030067A CN103969739B CN 103969739 B CN103969739 B CN 103969739B CN 201310030067 A CN201310030067 A CN 201310030067A CN 103969739 B CN103969739 B CN 103969739B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 69
- 238000009826 distribution Methods 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000000835 fiber Substances 0.000 claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 230000003287 optical effect Effects 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims description 2
- 230000000737 periodic effect Effects 0.000 claims 1
- 238000007493 shaping process Methods 0.000 claims 1
- 239000012943 hotmelt Substances 0.000 abstract description 3
- 230000010287 polarization Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005253 cladding Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005315 distribution function Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 238000012576 optical tweezer Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The invention discloses a kind of vortex optical fiber based on linear refractive index distribution fibre core and preparation method thereof, the optical fiber that the optical fiber is linearly distributed by fiber core refractive index carries out hot melt torsion and forms, therefore the refractive index of the fiber core is distributed laterally linear, in longitudinal helically curve distribution.This index distribution can cause to conduct waveform radially phase difference, so that the light wave transmitted in optical fiber obtains orbital angular momentum, while the transmission that is vortexed is formed in light intensity and phase, realize class vortex optical transmission mode.The optical fiber has the characteristics that structure is small, operation is flexible, system is stable and strong antijamming capability on the whole.It can be used for light beam generation, particulate manipulation, Application in Sensing etc..
Description
(1) technical field
The present invention relates to a kind of optical fiber and its technology of preparing, and in particular to a kind of vortex light based on linear refractive index distribution
Fibre and preparation method thereof.
(2) background technology
One of vortex beams is noteworthy characterized by with orbital angular momentum (Physical Review A, 1992,45 (11)：
8185-8189), therefore it is widely studied, and has been obtained greatly in communication, optical tweezer, Atomic Manipulation and microtechnic in recent years
Using.The most common process for generating vortex beams is to use spatial light modulator (Optics Express, 2008,16 (21)：
16984-16992), but spatial light modulator is generally bulky, expensive, and needs to realize light in free space
Coupling, thus brings many inconvenience.
And the vortex photoproduction based on optical fiber grows up to be a useful person and then has more advantage on remote interaction and making tight type vortex optical device.
Researchers use acoustics long-period gratings (Physical Review Letters, 2006,96 (4)：43604) or utilize
Induced pressure (Applied Optics, 1998,37 (3) in multimode fibre：469-472) realize vortex optical transport mould
Formula.But Mode Coupling can destroy orbital angular momentum pattern in a fiber, so as to cause multipath interference.In most multimode light
In fibre, TE/TM patterns and the HE needed21Pattern coexists, and so they can be generated linear by Mode Coupling in output terminal
Polarization mode (LP patterns), LP patterns are not the real eigen mode of optical fiber, it can not carry orbital angular momentum.Therefore,
Document (Optics Letters, 2012,37 (13)：2451-2453) report using micro-bend grating to slacken high-order LP11Pattern
Generation, and then input pattern is converted into required HE21Pattern, ultimately generates the vortex beams of high-purity.
United States Patent (USP) (US20080101754) and European patent (EP1705503B1) propose a kind of fiber core refractive index only
With the gradient index fibre of azimuthal variation, this optical fiber can regard the space phase plate longitudinally extended as, utilize the optical fiber
Vortex beams can be generated.Although the vortex beams maker structure is extremely simple, it is extremely difficult to prepare this optical fiber,
Therefore the present invention is proposed reverses the novel scroll optical fiber formed, this vortex by the optical fiber hot melt of fiber core refractive index linear distribution
Optical fiber is not only prepared and is easier, and can be vortexed at the same time in light intensity and phase.
(3) content of the invention
It is an object of the invention to provide a kind of vortex optical fiber for generating class vortex optical transmission mode and preparation method thereof.
The object of the present invention is achieved like this：
One of vortex beams is noteworthy characterized by with orbital angular momentum, and orbital angular momentum, optical fiber must be taken in order to obtain
Band higher order pattern, for example, phase shift is two HE of ± pi/221Orbital angular momentum pattern can be achieved in the linear combination of pattern.By
It is distributed in the fiber core refractive index of the vortex optical fiber of the present invention laterally linear, in longitudinal helically curve distribution, thus works as light
When ripple is input to vortex optical fiber, it is poor that radial phase can be formed because of the difference of index distribution, so that conduction light wave obtains rail
Road angular momentum, while the transmission that is vortexed is formed in light intensity and phase, realize class vortex optical transmission mode.
Compared with prior art, advantages of the present invention is：
1st, vortex optical fiber prepare it is simple, can directly by fiber core refractive index linear distribution optical fiber hot melt torsion form.
2nd, the refractive index Spiral distribution function of vortex optical fiber is finally can be achieved to generating whirlpool in preparation process
Revolve the control of beam characteristics.
3rd, vortex optical fiber space pliability is fabulous, therefore can select to export in any suitable position and direction and be vortexed
Light beam, easy in particulate manipulation and the application sensed.
(4) illustrate
Fig. 1 is the vortex optical fiber schematic diagram for the helical curve that fiber core refractive index is distributed as constant pitch；
Fig. 2 is the one-dimensional schematic diagram of three-dimensional (b) two peacekeeping (c) of cross section index distribution (a) of Fig. 1 vortex optical fiber；
Fig. 3 is the normalization light intensity transmission figure of vortex optical fiber；
Fig. 4 is vortex optical fiber in Z=1000 μm of (a), Z=1100 μm of (b), Z=1200 μm of (c) and (d) Z=1300 μm of horizontal stroke
Phase distribution figure at section；
Fig. 5 is the polarization maintaining optical fibre schematic diagram of refractive index linear distribution；
Fig. 6 is that vortex optical fiber prepares schematic diagram；
Fig. 7 is the vortex optical fiber schematic diagram for the helical curve that fiber core refractive index is distributed as pitch change；
Fig. 8 is that the vortex optical fiber for the helical curve that the tail optical fiber with light source is distributed as constant pitch with fiber core refractive index is connected and shows
It is intended to；
The vortex optical fiber for the helical curve that Fig. 9 is the tail optical fiber with light source is distributed as pitch change with fiber core refractive index, which is connected, to be shown
It is intended to；
(5) embodiment
Illustrate below in conjunction with the accompanying drawings and the present invention is described in more detail：
With reference to Fig. 1-Fig. 4, the first embodiment of the invention has one section of vortex optical fiber, the index distribution of its covering 1
For constant constant ncl, and the refractive index of fibre core 2 is in laterally linear distribution (such as Fig. 2, minimum value n1, maximum n2),
Longitudinal direction is distributed 3 in the helical curve of constant pitch.To one end input light source 4 of the vortex optical fiber, can be given birth in vortex optical fiber
Into vortex optical transmission mode, while realize that light intensity as shown in Figure 3 is vortexed and phase vortex as shown in Figure 4.
The preparation process of the optical fiber can be divided into following steps (such as Fig. 5-Fig. 6)：
Step 1：As shown in figure 5, choosing one section of polarization maintaining optical fibre 6, the index distribution of the fibre cladding 7 is constant constant
ncl, and the refractive index of fibre core 8 is linear distribution (minimum value n1, maximum n2)；
Step 2：As shown in fig. 6, fixing 6 one end of polarization maintaining optical fibre with fiber clamp 9, the other end applies a normal load
10, polarization maintaining optical fibre 6 is always maintained at plumbness；
Step 3：The polarization maintaining optical fibre 6 fixed is heated, when the optical fiber in thermal region 11 to be added is in molten condition
Apply an axial torsion power 12；
Step 4：Stop heating, vortex optical fiber 13 is obtained after the optical fiber cooling in hot-zone 11 to be added.
With reference to Fig. 7, second of embodiment of the invention is similar with the first embodiment, but vortex fiber core at this time
2 refractive index is in laterally still linear distribution, but the helical curve distribution 14 in longitudinal direction in pitch change, in preparation process
In, it can realize this index distribution by controlling the reverse speed of twisting resistance 12.
Embodiment 1：
1st, prepared by optical fiber：Method for preparing optical fiber according to the first embodiment prepares vortex optical fiber 13；
2nd, light source couples：The vortex optical fiber 13 prepared is cut, then with the single mode optical fiber 15 with light source tail optical fiber
Alignment, welding, as shown in Figure 8；
3rd, vortex beams generate：It will realize that vortex optical mode transmits in vortex optical fiber 13 after input laser 16, and
Can be in optical fiber end output class vortex beams.
Embodiment 2：
17 generation of vortex optical fiber that vortex optical fiber 13 in embodiment 1 can be changed by the pitch of index distribution helical curve
Replace, such as Fig. 9.
Claims (4)
1. a kind of vortex optical fiber based on linear refractive index distribution fibre core, it is characterized in that：The vortex optical fiber include covering and
Fibre core, fibre core are located at the center of whole covering, and the index distribution of its covering is constant constant, and the refractive index of its fibre core is in optical fiber
,, can be because of folding when light wave is input to vortex optical fiber in longitudinal helically curve distribution in the linear distribution gradually changed in transverse direction
Penetrate the difference of rate distribution and to form radial phase poor, so that conduction light wave obtains orbital angular momentum, while in light intensity and phase
It is upper to form the transmission that is vortexed, realize class vortex optical transmission mode.
2. the vortex optical fiber according to claim 1 based on linear refractive index distribution fibre core, its preparation process are：(1) will
One section of fiber core refractive index is fixed in optical fiber transverse direction in optical fiber one end of the linear distribution gradually changed, and it is vertical that the other end applies one
Load, is allowed to be always maintained at plumbness；(2) optical fiber is heated, is reversed when optical fiber is in molten condition；
(3) vortex optical fiber will be formed after the optical fiber cooling and shaping in twisting states.
3. the vortex optical fiber according to claim 1 based on linear refractive index distribution fibre core, it is characterized in that：The vortex
Fiber core refractive index pitch H in spiral distribution in the vertical meets following relation：2 π (β of H ＞1-β2)-1, wherein β1Represent fine
The transmission of core basic mode, β2Represent the transmission of covering basic mode.
4. the vortex optical fiber based on linear refractive index distribution fibre core according to claim 1-3 any one, it is characterized in that：
Vortex fiber core refractive index periodic characteristic in spiral distribution in the vertical is：Constant cycle or variable period.
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242347B (en) * | 2015-10-13 | 2018-05-15 | 华南理工大学 | A kind of high-purity, the orbital angular momentum Transmission Fibers of low intrinsic crosstalk |
| CN105572794B (en) * | 2016-03-08 | 2019-03-05 | 哈尔滨工程大学 | A kind of triangle core rotational field optical fiber and preparation method thereof |
| US10429584B2 (en) * | 2016-11-22 | 2019-10-01 | Lumentum Operations Llc | Rotary optical beam generator |
| US10690855B2 (en) | 2016-11-22 | 2020-06-23 | Lumentum Operations Llc | Tapered non-concentric core fibers |
| US11347069B2 (en) | 2016-11-22 | 2022-05-31 | Lumentum Operations Llc | Rotary optical beam generator |
| US10656334B2 (en) | 2016-11-22 | 2020-05-19 | Lumentum Operations Llc | Rotary optical beam generator |
| CN108593995B (en) * | 2017-12-26 | 2020-11-24 | 上海大学 | Optical vortex mode all-fiber current sensor |
| CN108227220B (en) * | 2017-12-26 | 2020-04-03 | 上海大学 | Composite light vortex generation method |
| CN110119044A (en) * | 2018-02-07 | 2019-08-13 | 桂林电子科技大学 | Microarray piezoelectric ceramics optical fiber acousto-optic modulator and its manufacturing method |
| CN110119039A (en) * | 2018-02-07 | 2019-08-13 | 桂林电子科技大学 | Spiral microarray format modulation type optical fiber vortex field generator |
| CN110967789B (en) * | 2018-08-06 | 2022-08-02 | 朗美通经营有限责任公司 | Rotary light beam generator |
| WO2020107254A1 (en) * | 2018-11-28 | 2020-06-04 | 深圳大学 | Chiral fiber grating-based polarization-independent orbital angular momentum modulator, preparation method therefor, and orbital angular momentum beam generator |
| CN113036584A (en) * | 2021-03-02 | 2021-06-25 | 江苏科技大学 | Ultrashort pulse vortex light beam generating device |
| CN113149426A (en) * | 2021-04-20 | 2021-07-23 | 厦门理工学院 | Manufacturing method of decoherence optical fiber |
| CN113376736B (en) * | 2021-06-18 | 2022-09-02 | 天津工业大学 | Vortex integrated multiplexing/demultiplexing optical fiber suitable for 6G communication |
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| EP1705503B1 (en) * | 2005-03-04 | 2008-04-30 | Fujitsu Limited | A chiral optical waveguide |
| JP5778939B2 (en) * | 2011-02-14 | 2015-09-16 | 株式会社フジクラ | Manufacturing method of optical fiber |
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Non-Patent Citations (2)
| Title |
|---|
| Generation and conversion of optical vortices in long-period helical core optical fibers;Constantine N. Alexeyev et al.;《PHYSICAL REVIEW A》;20081030;第78卷(第4期);第043828-1页第1段至043828-10页最后1段，及附图1-3 * |
| Single- and double-helix chiral fiber sensors;Victor I. Kopp et al.;《J. Opt. Soc. Am. B》;20070808;第24卷(第10期);第A48页第1段至A50页最后1段，及附图1-3 * |
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