CN103969737A - Asymmetric birefringence vortex fiber and manufacturing method of asymmetric birefringence vortex fiber - Google Patents

Asymmetric birefringence vortex fiber and manufacturing method of asymmetric birefringence vortex fiber Download PDF

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CN103969737A
CN103969737A CN201310029915.0A CN201310029915A CN103969737A CN 103969737 A CN103969737 A CN 103969737A CN 201310029915 A CN201310029915 A CN 201310029915A CN 103969737 A CN103969737 A CN 103969737A
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vortex
optical fiber
asymmetric
stressed zone
stressed
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CN103969737B (en
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苑立波
邓洪昌
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Guilin University of Electronic Technology
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WUXI WANRUN PHOTONIC TECHNOLOGIES Co Ltd
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Abstract

The invention discloses an asymmetric birefringence vortex fiber and a manufacturing method of the asymmetric birefringence vortex fiber. The asymmetric birefringence vortex fiber is formed by drawing an optical fiber perform with a single stress area or dual stress areas in a rotary mode, and therefore the asymmetric birefringence vortex fiber has a single spiral stress area or dual spiral stress areas; in addition, due to asymmetric distribution of the stress areas or different materials of the stress areas, spirally-distributed asymmetric stress birefringence is generated in a fiber core of the asymmetric birefringence vortex fiber, a radial phase difference of transmission light waves is accordingly formed, the light waves transmitted in the asymmetric birefringence vortex fiber can accordingly obtain the orbital annular momentum, vortex phase transmission is generated, and a similar vortex light transmission mode is achieved. The asymmetric birefringence vortex fiber overall has the advantages of being tiny in structure, flexible in operation, stable in system, high in interference resistant capacity and the like, and can be used for vortex beam generation, particle control, sensing application and the like.

Description

Asymmetric double refraction vortex optical fiber and preparation method thereof
(1) technical field
The present invention relates to a kind of optical fiber and technology of preparing thereof, be specifically related to a kind of asymmetric double refraction vortex optical fiber and preparation method thereof, belong to optical fiber technology field.
(2) background technology
A notable feature of vortex beams is to have orbital angular momentum (Physical Review A, 1992,45 (11): 8185-8189), be therefore widely studied in recent years, and obtained very big application in communication, light tweezer, Atomic Manipulation and microtechnic.The common methods that generates vortex beams is usage space photomodulator (OpticsExpress, 2008,16 (21): 16984-16992), but spatial light modulator is generally bulky, expensive, and need in free space, realize optically-coupled, so just bring much inconvenience.
Vortex photoproduction based on optical fiber is grown up to be a useful person and in remote interaction and system miniaturization, is had more advantage.Researchers use acoustics long-period gratings (Physical Review Letters, 2006,43604) or utilize induction pressure (Applied Optics in multimode optical fiber 96 (4):, 1998,37 (3): 469-472) realized vortex optical transmission mode.But Mode Coupling can be destroyed orbital angular momentum pattern in optical fiber, thereby cause multipath interference.In most multimode optical fibers, TE/TM pattern and the HE needing 21pattern coexists, and they can generate linear polarization pattern (LP pattern) at output terminal through Mode Coupling like this, and LP pattern is not the real eigenmodes of optical fiber, and it can not carry orbital angular momentum.Therefore, document (Optics Letters, 2012,37 (13): 2451-2453) has been reported and has been utilized micro-curved grating to slacken high-order LP 11the generation of pattern, and then input pattern is converted into needed HE 21pattern, finally generates highly purified vortex beams.
Desirable standard single-mode fiber has how much good circular symmetries, thereby the basic mode HE transmitting 11the double degenerate mode of orthogonal modes.But in actual fiber, due to the existence of defect, this double degenerate is destroyed, thereby cause mode birefringence, in order to maintain this pattern polarization in standard single-mode fiber, people have designed polarization maintaining optical fibre.Polarization maintaining optical fibre makes with the effective refractive index difference of pattern, the propagation constant β of pairwise orthogonal mould xwith β ydifference increases, and two-mode coupling probability reduces, if therefore transmission light is by linear polarization in the parallel direction of optical axis of optical fiber, light will keep this polarization state to transmit in optical fiber always so.
United States Patent (USP) (US20080101754) and European patent (EP1705503B1) have proposed a kind of fiber core refractive index only with the gradient index fibre of azimuthal variation, this optical fiber can be regarded the space phase plate of longitudinal tensile strain as, utilizes this optical fiber can generate vortex beams.Although this vortex beams maker structure is very simple, but it is but very difficult to prepare this optical fiber, therefore the present invention, in polarization maintaining optical fibre technical foundation, has proposed a kind of Novel asymmetric birefringence vortex optical fiber, this vortex optical fiber is prepared than being easier to, and can produce class vortex beams.
(3) summary of the invention
The object of the present invention is to provide a kind of asymmetric double refraction vortex optical fiber that generates vortex optical transmission mode and preparation method thereof.
The present invention is achieved in that
A notable feature of vortex beams is to have orbital angular momentum, and in order to obtain orbital angular momentum, optical fiber must carry more higher order mode, for example, phase shift is ± and two HE of pi/2 21the linear combination of pattern can realize orbital angular momentum pattern.Because asymmetric double refraction vortex optical fiber of the present invention exists simple helix or double helix stressed zone, and the material difference of adulterating in two prestress rods of double helix stressed zone, therefore the difference of the mal-distribution of this stressed zone or stressed zone material, just cause the asymmetric stress birefringence in fibre core to distribute, and this is distributed in optical fiber longitudinally in the shape of a spiral, thereby be input to after this optical fiber when light wave, radial phase can be formed poor, thereby make the light field of wherein transmitting obtain orbital angular momentum, produce vortex transmission of phase, realize class vortex optical transmission mode.
Asymmetric double refraction vortex optical fiber of the present invention is from the different of polarization maintaining optical fibre, in the present invention, due to the difference of mal-distribution or the stressed zone material of stressed zone, there will not be the linear polarization property of polarization maintaining optical fibre, but along with the rotation of spiral stressed zone, in fibre core, there is vortex optical transmission mode in the also rotation thereupon of light conducting wave polarization state.
Compared with prior art, advantage of the present invention is:
1, the preparation of asymmetric double refraction vortex optical fiber is simple, can directly be drawn and be formed by the preform rotation with simple helix or double helix stressed zone.
2, refractive index Spiral distribution function and the stressed zone dopant material of asymmetric double refraction vortex optical fiber are controlled in preparation process, finally can realize the control to generating class vortex beams feature.
3, asymmetric double refraction vortex optical fiber space pliability is fabulous, therefore can be chosen in output class vortex beams in the position of any appropriate and direction, is convenient to the application in particulate manipulation and sensing.
(4) brief description of the drawings
Fig. 1 is the asymmetric double refraction vortex optical fiber schematic diagram with simple helix stressed zone;
Fig. 2 is the cross sectional representation with the asymmetric double refraction vortex optical fiber of simple helix stressed zone;
Fig. 3 is stress birefrin (a) three peacekeepings (b) two-dimensional representation with the asymmetric double refraction vortex optical fiber of simple helix stressed zone;
Fig. 4 is the light intensity transmission schematic diagram with the asymmetric double refraction vortex optical fiber of simple helix stressed zone;
Fig. 5 is the asymmetric double refraction vortex optical fiber with simple helix stressed zone at (a) Z=900 μ m, (b) Z=1000 μ m, (c) Z=1100 μ m and (d) the PHASE DISTRIBUTION figure of Z=1200 μ m cross-section;
Fig. 6 is that the preform with single stress district is prepared schematic diagram;
Fig. 7 be have simple helix stressed zone asymmetric double refraction vortex optical fiber prepare schematic diagram;
Fig. 8 is the asymmetric double refraction vortex optical fiber schematic diagram with double helix stressed zone;
Fig. 9 is the cross sectional representation with the asymmetric double refraction vortex optical fiber of double helix stressed zone;
Figure 10 is stress birefrin (a) three peacekeepings (b) two-dimensional representation with the asymmetric double refraction vortex optical fiber of double helix stressed zone;
Figure 11 is the preform preparation method schematic diagram with two stressed zones;
Figure 12 is preparation method's schematic diagram with the asymmetric double refraction vortex optical fiber of double helix stressed zone;
Figure 13 is the connection diagram of the tail optical fiber with light source and the asymmetric double refraction vortex optical fiber with simple helix stressed zone.
Figure 14 is the connection diagram of the tail optical fiber with light source and the asymmetric double refraction vortex optical fiber with double helix stressed zone.
(5) embodiment
For example the present invention is described in more detail below in conjunction with accompanying drawing:
In conjunction with Fig. 1-Fig. 5, the first embodiment of the present invention is to realize like this.
First the ultimate principle how light wave produces vortex light field after the asymmetric double refraction vortex optical fiber providing through one section of the present invention is described.Get one section of asymmetric double refraction vortex optical fiber, this optical fiber comprises covering 1, fibre core 2 and simple helix stressed zone 3.Due to the existence of simple helix stressed zone 3, cross section of optic fibre shown in Fig. 2 is carried out to the stress birefrin that stress analysis just can obtain as shown in Figure 3 to distribute (in Fig. 3 (a), the region representation core region that column fence surrounds, Z axis represents stress birefrin size N y-N xin Fig. 3 (b), gray scale size represents stress birefrin size), owing to existing this asymmetrical stress birefrin to distribute in fibre core, so in the time that light source 4 is inputted in the one end to this optical fiber, this optical fiber can generate class vortex optical transmission mode, its light intensity is transmitted as shown in Figure 4, in the PHASE DISTRIBUTION of Z=900 μ m, 1000 μ m, 1100 μ m and 1200 μ m cross-section as shown in Figure 5, as can be seen here, in this optical fiber, conduction light wave has vortex phase place, and it is a kind vortex beams.
Next provides the preparation method of asymmetric double refraction vortex optical fiber.The preparation process of this asymmetric double refraction vortex optical fiber with simple helix stressed zone can be divided into following step (as Fig. 6 and Fig. 7):
Step 1: as Fig. 6, squeeze into an eccentric orfice 7 in the preform 6 that contains core 5, then stressed zone prefabricated rods 8 is inserted in eccentric orfice 7, so just obtain having the preform 9 in single stress district;
Step 2: as Fig. 7, preform 9 is positioned on wire-drawer-tower, under the acting in conjunction of vertical distraction power 10 and twisting resistance 11, reverse wire drawing, after heating and corresponding aftertreatment 12, be prepared into the asymmetric double refraction vortex optical fiber 13 with simple helix stressed zone.
In conjunction with Fig. 8 and Fig. 9, be different from the first embodiment, the asymmetric double refraction vortex optical fiber of the second embodiment of the present invention has two stressed zones 14 and 15, forms double helix stressed zone structure.For this asymmetric double refraction vortex optical fiber with double helix stressed zone, Figure 10 is given in the stress birefrin distribution plan in fibre core, as can be seen from the figure the variation range of its stress birefrin is greater than the stress birefrin variation range (Fig. 3) of the asymmetric double refraction vortex fiber core with simple helix stressed zone, thereby the ability of this optical fiber generation vortex phase place is more outstanding.
The preparation process of this asymmetric double refraction vortex optical fiber with double helix stressed zone can be divided into following step (as Figure 11 and Figure 12):
Step 1: as Figure 11, in core fibre prefabricated rods 6, squeeze into two symmetrical eccentric orfices 7 containing, then two different stressed zone prefabricated rods 16 and 17 of dopant material are inserted respectively in two symmetrical eccentric orfices 7, so just obtained having the preform 18 of two stressed zones;
Step 2: as Figure 12, preform 18 is positioned on wire-drawer-tower, under the acting in conjunction of vertical distraction power 10 and twisting resistance 11, reverse wire drawing, after heating and corresponding aftertreatment 12, be prepared into the asymmetric double refraction vortex optical fiber 19 with double helix stressed zone.
Embodiment 1:
1, optical fiber preparation: prepare the asymmetric double refraction vortex optical fiber 13 with simple helix stressed zone according to the method for preparing optical fiber of the first embodiment;
2, light source coupling: the asymmetric double refraction vortex optical fiber 13 with simple helix stressed zone preparing is cut, then aim at, weld with the single-mode fiber 20 with light source tail optical fiber, as shown in figure 13;
3, vortex beams generates: after input laser 21, will in the asymmetric double refraction vortex optical fiber 13 with simple helix stressed zone, realize the transmission of vortex optical mode, and can be at optical fiber end output class vortex beams.
Embodiment 2:
1, optical fiber preparation: prepare the asymmetric double refraction vortex optical fiber 19 with double helix stressed zone according to the method for preparing optical fiber of the second embodiment;
2, light source coupling: the asymmetric double refraction vortex optical fiber 19 with double helix stressed zone preparing is cut, then aim at, weld with the single-mode fiber 20 with light source tail optical fiber, as shown in figure 14;
3, vortex beams generates: after input laser 21, will in the asymmetric double refraction vortex optical fiber 19 with double helix stressed zone, realize the transmission of vortex optical mode, and can be at optical fiber end output class vortex beams.

Claims (6)

1. an asymmetric double refraction vortex optical fiber, it is characterized in that: described asymmetric double refraction vortex optical fiber comprises fibre core, covering and stressed zone, its fibre core is in cladding center position, stressed zone can be single stress district, also can be two stressed zones, single stress district is only between fibre core and covering outer wall, two stressed zones are symmetrically distributed in the both sides of fibre core, and the dopant material difference of two prestress rods of two stressed zones, whole stressed zone distributes in the shape of a spiral around optical fiber axis, thereby in optical fiber, form simple helix or double helix stressed zone, the difference of the mal-distribution of this stressed zone or stressed zone material, cause the asymmetric stress birefringence in fibre core to distribute, and this is distributed in optical fiber longitudinally in the shape of a spiral, thereby be input to after this optical fiber when light wave, radial phase can be formed poor, thereby acquisition orbital angular momentum, produce vortex transmission of phase, realize class vortex optical transmission mode.
2. the preparation method of an asymmetric double refraction vortex optical fiber, its preparation process is: (1) squeezes into eccentric single hole or symmetrical diplopore in belt carcass preform, then in single hole or diplopore, insert stressed zone prefabricated rods, so just obtain having the preform of Huo Shuan stressed zone, single stress district; (2) preform preparing is positioned on wire-drawer-tower and reverses wire drawing, can form asymmetric double refraction vortex optical fiber.
3. according to claim 1 and claimed in claim 2 based on asymmetric double refraction vortex optical fiber and preparation method thereof, it is characterized in that: described single stress district dopant material can be the dopant material in conventional Stress Profile for Polarization-Maintaining district, for example B 2o 3, P 2o 5.
4. according to claim 1 and claimed in claim 2 based on asymmetric double refraction vortex optical fiber and preparation method thereof, it is characterized in that: the feature of described two stressed zones dopant material is: the expansion coefficient of a stressed zone dopant material is greater than covering, for example B 2o 3, P 2o 5; The expansion coefficient of another stressed zone dopant material is less than covering, for example TiO 2.
5. according to claim 1 and claimed in claim 2 based on asymmetric double refraction vortex optical fiber and preparation method thereof, it is characterized in that: the pitch H of described simple helix or double helix stressed zone meets following relation: H > 2 π (β 12) -1, wherein β 1represent the transmission of fibre core basic mode, β 2represent the transmission of covering basic mode.
6. according to claim 1 and claimed in claim 2 based on asymmetric double refraction vortex optical fiber and preparation method thereof, it is characterized in that: the period profile feature of described simple helix or double helix stressed zone is: constant cycle or variable period.
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CN104503020A (en) * 2014-12-19 2015-04-08 华中科技大学 Longitudinal spiral mode transfer optical fiber
CN105182468A (en) * 2015-09-23 2015-12-23 上海大学 Multi-lobe stress region circular single polarization optical fiber and manufacturing method thereof
CN105572794A (en) * 2016-03-08 2016-05-11 哈尔滨工程大学 Triangular-core vortex field optical fiber and preparation method thereof
CN105750181A (en) * 2016-03-11 2016-07-13 南京大学 Device for generating acoustic vortex field by utilizing acoustic metamaterial
CN108089338A (en) * 2016-11-22 2018-05-29 朗美通经营有限责任公司 Rotary light beam generator
CN109752789A (en) * 2017-11-03 2019-05-14 桂林电子科技大学 Particle light manipulation device based on the coaxial double wave guiding fiber of toroidal cores
CN109752790A (en) * 2017-11-03 2019-05-14 桂林电子科技大学 A kind of producible vortex light and the coaxial double wave guiding fiber of toroidal field and preparation method thereof
CN109799571A (en) * 2018-12-12 2019-05-24 桂林电子科技大学 Particle light manipulation device based on toroidal cores coaxial spiral waveguide fiber
CN109912193A (en) * 2019-03-19 2019-06-21 中国电力科学研究院有限公司 Photonic crystal fiber and preparation method thereof
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CN112147739A (en) * 2019-06-26 2020-12-29 上海康阔光智能技术有限公司 Bending-resistant and torsion-resistant optical fiber for optical fiber gyroscope, and sensing optical fiber ring and optical fiber gyroscope using same
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CN104503020A (en) * 2014-12-19 2015-04-08 华中科技大学 Longitudinal spiral mode transfer optical fiber
CN105182468A (en) * 2015-09-23 2015-12-23 上海大学 Multi-lobe stress region circular single polarization optical fiber and manufacturing method thereof
CN105182468B (en) * 2015-09-23 2019-01-11 上海大学 Leafy stressed zone circle single polarization fiber and preparation method thereof
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
CN105572794A (en) * 2016-03-08 2016-05-11 哈尔滨工程大学 Triangular-core vortex field optical fiber and preparation method thereof
CN105750181A (en) * 2016-03-11 2016-07-13 南京大学 Device for generating acoustic vortex field by utilizing acoustic metamaterial
CN113238385A (en) * 2016-11-22 2021-08-10 朗美通经营有限责任公司 Rotary light beam generator
CN108089338B (en) * 2016-11-22 2021-05-11 朗美通经营有限责任公司 Rotary light beam generator
CN108089338A (en) * 2016-11-22 2018-05-29 朗美通经营有限责任公司 Rotary light beam generator
CN113238385B (en) * 2016-11-22 2024-04-02 朗美通经营有限责任公司 Rotary light beam generator
US11347069B2 (en) 2016-11-22 2022-05-31 Lumentum Operations Llc Rotary optical beam generator
CN109752790A (en) * 2017-11-03 2019-05-14 桂林电子科技大学 A kind of producible vortex light and the coaxial double wave guiding fiber of toroidal field and preparation method thereof
CN109752790B (en) * 2017-11-03 2020-11-06 桂林电子科技大学 Coaxial double-waveguide optical fiber capable of generating vortex rotation and annular field and preparation method thereof
CN109752789A (en) * 2017-11-03 2019-05-14 桂林电子科技大学 Particle light manipulation device based on the coaxial double wave guiding fiber of toroidal cores
US11536895B2 (en) 2018-11-28 2022-12-27 Shenzhen University Method for manufacturing polarization-independent orbital angular momentum modulator
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
CN109799571A (en) * 2018-12-12 2019-05-24 桂林电子科技大学 Particle light manipulation device based on toroidal cores coaxial spiral waveguide fiber
CN109912193A (en) * 2019-03-19 2019-06-21 中国电力科学研究院有限公司 Photonic crystal fiber and preparation method thereof
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CN113376736A (en) * 2021-06-18 2021-09-10 天津工业大学 Vortex integrated multiplexing/demultiplexing optical fiber suitable for 6G communication

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