CN109100827A - A kind of optical fiber and preparation method thereof kept for vortex beams transmission - Google Patents
A kind of optical fiber and preparation method thereof kept for vortex beams transmission Download PDFInfo
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- CN109100827A CN109100827A CN201810768362.3A CN201810768362A CN109100827A CN 109100827 A CN109100827 A CN 109100827A CN 201810768362 A CN201810768362 A CN 201810768362A CN 109100827 A CN109100827 A CN 109100827A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03622—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02004—Optical fibres with cladding with or without a coating characterised by the core effective area or mode field radius
- G02B6/02009—Large effective area or mode field radius, e.g. to reduce nonlinear effects in single mode fibres
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/032—Optical fibres with cladding with or without a coating with non solid core or cladding
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Abstract
The present invention relates to a kind of optical fiber and preparation method thereof kept for vortex beams transmission, the present invention carries out reasonable disposition by the refractive index to each covering of inside of optical fibre, and it combines using rotation wire-drawing technology, provide a kind of spin fiber applied to the ring type structure index distribution kept with the transmission of orbital angular momentum vortex beams, the optical fiber has loss low, bending loss is low, dispersion is lower, and effective area is larger, structure is simple, price is cheap, the features such as being easy to industrialization production, mode division multiplexing and Space-division multiplexing system suitable for optic communication, and it can be applied to optical fiber laser, in fibre optical sensor, carry out the transmission and generation of vortex beams, with good popularizing value.
Description
Technical field
The invention belongs to optical fiber transmission technique fields, and in particular to it is a kind of for vortex beams transmission keep optical fiber and its
Preparation method.
Background technique
With the continuous quickening of modern society's IT application process, bandwidth consumption type business is increasing, information transmission system
The capacity requirement of system is constantly promoted.Base communication facility of the Fibre Optical Communication Technology as the current whole world, supports sound, video sum number
It is worldwide transmitted according to equal, is faced with the inevitable rapid growth problem of data transmission capacity.In the past few years, China's light
Network data demand wants growth rate to be up to 200%, increasingly higher demands is proposed to the transmission capacity of optical-fiber network, to improve information
Transmission capacity and rate, new solution are constantly pushed out, including wavelength-division multiplex, time division multiplexing, space division multiplexing etc., respectively from
Single channel transmission rate, broadband utilization rate and multi fiber multiplex mode improve.And numerous work concentrate on utilizing the inclined of light field
Vibration, amplitude, phase and wavelength etc. improve the research of data spectrum utilization rate.However, due to lacking breakthrough new technology, optical fiber
The annual growth of network transmission speed is far below market to the rate of rise of transmission capacity.Until 2013, boston, U.S.A was big
S.Ramachandran professor et al. reports a kind of novel optical fiber technology based on vortex beams, the optical fiber transmission mode number
Greater than single mode optical fiber, but it is less than legacy multimode fiber, i.e. less fundamental mode optical fibre (FMF), can be used for mode multiplexing (MDM) system, be one
The attractive gimmick of optical fiber transmission capacity is significantly greatly increased in kind.
Vortex beams are the light beams that there is helical phase to be distributed, and each photon carries light track angular momentum information.Cause
OAM (Orbital Angular Momentum/ orbital angular momentum) has unlimited eigen state, so after amplitude, phase, partially
Vibration state, OAM provide a new freedom degree again for control light field.In order to promote the transmission capacity of future optical networks, researcher
By sight turn to the still unemployed freedom degree of OAM mode.Using between the infinite property of OAM mode quantity and each mode
Orthogonality, different OAM modes, which are corresponded to different data informations, can greatly promote existing optical communication capability (Optics
Express, 2010,18 (24): 24722-24728；Photonics Journal, IEEE, 2011,3 (3): 531-537；
Optics Express, 2011,19 (17): 16708-16714).The method for generating OAM light beam has very much, such as spiral phase plate
Method of formation, q wave plate method, geometric mode transformation approach, spatial light modulator method.OAM mode is in addition to that can apply in optical communication field
Outside, it is captured in other many fields, such as light, optical wrench, atom manipulation, optical fiber laser, quantum communications, quantum entanglement etc.
There are more research and application.In recent years, free space optical communication and fiber optic communication based on OAM multiplexing are quickly grown.?
In free space link, by being multiplexed there is the Laguerre Gaussian beam of specific different topology nucleus number to improve existing optic communication
The availability of frequency spectrum and transmission capacity of system are considered as a kind of highly effective method, and carry out signal using OAM light beam
Transmission the safety of information can be improved.But in free space, the propagation of vortex beams is easy by atmospheric turbulance etc.
The influence of poor environment is easy to happen crosstalk between each OAM light beam to limit its transmission range.In order to be able to satisfy over long distances,
The optical communication system of large capacity, how generating in a fiber and transmitting OAM mode becomes the research hotspot of fiber optic communication field.
Optical fiber has been deep into optic communication, laser, light biography as the very important carrier in optic communication transmission application field
How sense etc. realizes the transmission of OAM mode by optical fiber and regulation is current crucial scientific and technical problem still to be solved.It adopts
OAM mode is transmitted with optical fiber, and promotion for communication capacity, the precision improvement of optics micro Process and micro- manipulation, optical fiber swashs
The expansion of the new mechanism, new system such as light device, fibre optical sensor, all has highly important meaning.Design ring type structure refractive index
Distribution, the vortex beams using transmission with different orbital angular momentums are realized novel coding mode, are applied to as the carrier of information
Free space optical communication and fiber optic communication field；Also, the vortex beams of ring type structure index distribution are used as optical tweezers
Or optical wrench, reach the microcosmic particle purpose for manipulating different sizes and position；In addition, being taken using polycyclic each ring of type vortex beams
The different orbital angular momentums of band are encoded, and optic communication code capacity is improved, so that it is in optic communication and quantum communications, and
The fields such as Fibre Optical Sensor have special researching value and application potential.Accordingly, it is desirable to provide a kind of transmit for vortex beams
Optical fiber and preparation method thereof, meet the demand.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of optical fiber for vortex beams transmission and its preparation sides
Method.
The present invention is achieved by the following technical programs:
A kind of optical fiber kept for vortex beams transmission, including fibre core, inner cladding and surrounding layer, the fibre core setting
At the center of inner cladding, inner cladding is wrapped in inside it by the surrounding layer；The refractive index of the fibre core is with respect to inner cladding
The variation range of refringence is 0.005-0.08；The fibre core, inner cladding and surrounding layer are greater than meeting cutoff wavelength
LP is supported at the wavelength of 1000nm01And LP11Mould (TM01,HE21,TE01), LP21(HE31,EH11), LP31(HE41,EH21) ...
LPn1, n < 15, and the △ neff of each vector intermode is greater than 1 × 10-4, with preferable modal cutoff characteristic.
Further, the fibre core is made using the quartz material containing germanium dioxide, and wherein the content of germanium dioxide is
0-0.2mol%.
Further, the fibre core is air-core.
Further, the inner cladding is made using the quartz material containing germanium and phosphorus, and wherein the content of germanium is 1.0-
35.0mol%, the content of phosphorus are 0.2-5.0mol%.
Further, the surrounding layer is made of pure quartz material.
Further, the diameter of the fibre core is 2-3 μm, and the diameter of inner cladding is 8-12 μm, and the diameter of surrounding layer is
125-300μm。
Further, the diameter of the fibre core is 3-6 μm, and the diameter of inner cladding is 12-15 μm, and the diameter of surrounding layer is
125-300μm。
Further, the diameter of the fibre core is 5-15 μm, and the diameter of inner cladding is 25-50 μm, and the diameter of surrounding layer is
125-300μm。
A kind of preparation method of the optical fiber kept for vortex beams transmission is used to prepare the above-mentioned vortex beams that are used for and passes
The optical fiber of defeated holding, comprising the following steps:
Step 1, using sedimentation on fibre core sedimentary inner envoloping layer, then, then surrounding layer is deposited on inner cladding, formed
Preform to be sintered；
Preform is carried out high temperature sintering, forms preform to be drawn by step 2；
Preform is carried out wire drawing, while axially being rotated along preform by step 3, makes its screw pitch range
In 0.05-10mm, the preparation of optical fiber is completed.
In step 1, the sedimentation is Modified Chemical Vapor Deposition method, heating furnace chemical vapour deposition technique, plasma
One of chemical vapour deposition technique, outside vapor deposition, axial vapor deposition method and atomic layer deposition method or any group
It closes.
Compared with prior art, the beneficial effects of the present invention are:
The present invention carries out reasonable disposition by the refractive index to each covering of inside of optical fibre, in conjunction with using rotation wire drawing skill
Art provides a kind of rotation light applied to the ring type structure index distribution kept with the transmission of orbital angular momentum vortex beams
Fibre, the optical fiber is low with loss, bending loss is low, dispersion is lower and effective area is larger, structure is simple, price is cheap, easily
In the industrialization production the features such as, mode division multiplexing and Space-division multiplexing system suitable for optic communication, and can be applied to
In optical fiber laser, fibre optical sensor, the transmission of vortex beams is carried out, there is good popularizing value.
Detailed description of the invention
Fig. 1 is cross section of optic fibre structural schematic diagram of the invention；Wherein 1- fibre core, 2- inner cladding, 3- surrounding layer.
Fig. 2 is optical fiber structure and index of refraction relationship schematic diagram of the invention.
Fig. 3 is the relational graph of different mode effective refractive index distribution and optical fiber inner cladding core diameter of the invention.
Fig. 4 is the rotation screw pitch schematic diagram in material object of the invention, and the rotation screw pitch in figure is 1.457mm.
Fig. 5 is rotation screw pitch schematic diagram of the present invention in simulation analysis.
Specific embodiment
Specific embodiments of the present invention are further described with reference to the accompanying drawing, but claimed range is not limited to
This.
As shown in Figure 1, a kind of optical fiber kept for vortex beams transmission, including fibre core 1, inner cladding 2 and surrounding layer
3, the fibre core 1 is set at the center of inner cladding 2, and inner cladding 2 is wrapped in inside it by the surrounding layer 3；The fibre core 1
Refractive index is 0.005-0.08 with respect to the variation range of the refringence of inner cladding 2；The fibre core 1, inner cladding 2 and surrounding layer
3 are meeting support LP at wavelength of the cutoff wavelength greater than 1000nm01And LP11Mould (TM01,HE21,TE01), LP21(HE31,EH11),
LP31(HE41,EH21) ... LPn1, n < 15, and the △ neff of each vector intermode is greater than 1 × 10-4, with compared with good model point
From characteristic.
The fibre core 1 is made using the quartz material containing germanium dioxide, and wherein the content of germanium dioxide is 0-
0.2mol%.
The fibre core 1 is air-core.
The inner cladding 2 is made using the quartz material containing germanium and phosphorus, and wherein the content of germanium is 1.0-
35.0mol%, the content of phosphorus are 0.2-5.0mol%.
The surrounding layer 3 is made of pure quartz material.
The diameter of the fibre core 1 is 2-3 μm, and the diameter of inner cladding 2 is 8-12 μm, and the diameter of surrounding layer 3 is 125-300 μ
m。
The diameter of the fibre core 1 is 3-6 μm, and the diameter of inner cladding 2 is 12-15 μm, and the diameter of surrounding layer 3 is 125-300 μ
m。
The diameter of the fibre core 1 is 5-15 μm, and the diameter of inner cladding 2 is 25-50 μm, and the diameter of surrounding layer 3 is 125-300
μm。
A kind of preparation method of the optical fiber kept for vortex beams transmission is used to prepare the above-mentioned vortex beams that are used for and passes
The optical fiber of defeated holding, comprising the following steps:
Step 1, using sedimentation on fibre core 1 sedimentary inner envoloping layer 2, then, then on inner cladding 2 deposit surrounding layer 3,
Form preform to be sintered；
Preform is carried out high temperature sintering, forms preform to be drawn by step 2；
Preform is carried out wire drawing, while axially being rotated along preform by step 3, makes its screw pitch range
In 0.05-10mm, the preparation of optical fiber is completed.
In step 1, the sedimentation is Modified Chemical Vapor Deposition method, heating furnace chemical vapour deposition technique, plasma
One of chemical vapour deposition technique, outside vapor deposition, axial vapor deposition method and atomic layer deposition method or any group
It closes.
Embodiment one:
As shown in Figure 1, a kind of optical fiber for vortex beams transmission is surrounded including the fibre core 1 being distributed with low-refraction
The surrounding layer 3 of fibre core 1 and ring type structure inner cladding 2 and pure quartz composition with certain index distribution, the fibre core 1
With inner cladding 2 in the cut-off wave strong point for being greater than 1100nm, LP is only supported01And LP11Mould, and LP01And LP11The folding of different intermodes
It is as shown in Figure 3 to penetrate rate distribution.Meanwhile using rotation drawing process preparation there is the ring type structure of certain index distribution to rotate light
Fibre, and there is different screw pitch (pitch) structure, as shown in figure 5, selecting Pitch=2.5mm here.
Optical fiber is Stepped-index distribution, wherein the fibre core 1 is the quartz material of a small amount of doping germanium dioxide, interior packet
Layer 2 is fluorine doped, boron-doping quartz glass constituent material, and surrounding layer 3 is pure quartz material, and furthermore fibre core 1 can also be hollow structure.
It is characterized in that the core diameter range is at 2-3 μm, 2 diameter range of inner cladding is 8-12 μm, and fibre core 1 and inner cladding 2 reflect
The variation range of rate difference is 0.005-0.08, and the refractive index of fibre core 1 is lower than the pure quartz material of surrounding layer 3 and is greater than
0.002, the diameter of bare fibre is 125 μm.
Embodiment two:
Referring to fig. 2, Fig. 3 and Fig. 4, a kind of manufacturing step of the optical fiber applied to vortex beams transmission are as follows:
Mixing germanium covering and then adulterating a small amount of fluorine for high refractive index distribution is sequentially depositing improving chemical vapour deposition technique first
Compound or boride quartz inner cladding or pure quartz are used as sandwich layer.
By chemical vapour deposition technique technology, it is sintered at high temperature into the optical fiber of hollow structure solid or with certain pore structure
Prefabricated rods, preform core diameter and outer dia are respectively 2mm and 15mm；
By preform in wire-drawer-tower drawing optical fiber, the diameter of fibre core 1 and inner cladding 2 is respectively a1And a2, wire drawing
Simultaneously along preform axial-rotation, selecting screw pitch here is 1.5mm.Finally, being drawn into certain index distribution
Ring type structure spin fiber is transmitted for vortex beams.The index distribution of the optical fiber is step change type and gradation type structure,
Middle gradation type index distribution substantially meets y1=a [x- (a1+a2)/4]2+ bx+c and y2=a [x+ (a1+a2)/4]2Two kinds of+bx+c
Equation, wherein a, b, c are any real number, and x indicates the distance apart from fiber optic hub, y1、y2Indicate refractive index.
Embodiment three:
Manufacturing method of the another kind for the optical fiber of vortex beams transmission, specific as follows:
First on export-oriented vapour deposition process (OVD) bar-producing machine, the titanium dioxide of vapour deposition process doping high refractive index is utilized
The weaker zone of germanium and quartz, is fibre core 1 and inner cladding 2, and optical fiber structure such as Fig. 1 and Fig. 2 deposit quartzy weaker zone as surrounding layer
3, it is deposited according to optical fiber structure parameter, design parameter requires as shown in the table；
Then, it is sintered at high temperature into the preform of solid or hollow structure；
By preform, drawing optical fiber, the diameter of fibre core 1 are respectively 2.5 μm in wire-drawer-tower, and 4.0 μm, 6.5 μm, 10 μ
m.The diameter of inner cladding 2 is respectively 12.0 μm, and 15.0 μm, 20.0 μm, 25.0 μm of wire drawings whiles axially revolves along preform
Turn, selecting screw pitch here is that 2.0mm and 3.0mm is drawn respectively.Finally be drawn into different structure has certain refractive index
The ring type structure spin fiber of distribution is transmitted for vortex beams.
Claims (10)
1. a kind of optical fiber kept for vortex beams transmission, it is characterised in that: including fibre core (1), inner cladding (2) and outsourcing
Layer (3), the fibre core (1) are set at the center of inner cladding (2), and the surrounding layer (3) wraps up inner cladding (2) in the inner
Portion；The refractive index of the fibre core (1) is 0.005-0.08 with respect to the variation range of the refringence of inner cladding (2)；The fibre core
(1), inner cladding (2) and surrounding layer (3) are meeting support LP at wavelength of the cutoff wavelength greater than 1000nm01And LP11Mould
(TM01, HE21, TE01), LP21(HE31, EH11), LP31(HE41, EH21) ... LPn1, n < 15, and the △ of each vector intermode
Neff is greater than 1 × 10-4, with preferable modal cutoff characteristic.
2. the optical fiber according to claim 1 kept for vortex beams transmission, it is characterised in that: the fibre core (1) makes
It is made of the quartz material containing germanium dioxide, wherein the content of germanium dioxide is 0-0.2mol%.
3. the optical fiber according to claim 1 kept for vortex beams transmission, it is characterised in that: the fibre core (1) is
Air-core.
4. the optical fiber according to claim 1 kept for vortex beams transmission, it is characterised in that: the inner cladding (2)
It is made using the quartz material containing germanium and phosphorus, wherein the content of germanium is 1.0-35.0mol%, and the content of phosphorus is 0.2-
5.0mol%。
5. the optical fiber according to claim 1 kept for vortex beams transmission, it is characterised in that: the surrounding layer (3)
It is made of pure quartz material.
6. the optical fiber according to claim 1 kept for vortex beams transmission, it is characterised in that: the fibre core (1)
Diameter is 2-3 μm, and the diameter of inner cladding (2) is 8-12 μm, and the diameter of surrounding layer (3) is 125-300 μm.
7. the optical fiber according to claim 1 kept for vortex beams transmission, it is characterised in that: the fibre core (1)
Diameter is 3-6 μm, and the diameter of inner cladding (2) is 12-15 μm, and the diameter of surrounding layer (3) is 125-300 μm.
8. the optical fiber according to claim 1 kept for vortex beams transmission, it is characterised in that: the fibre core (1)
Diameter is 5-15 μm, and the diameter of inner cladding (2) is 25-50 μm, and the diameter of surrounding layer (3) is 125-300 μm.
9. a kind of preparation method of the optical fiber kept for vortex beams transmission is used to prepare the above-mentioned vortex beams that are used for and transmits
The optical fiber of holding, which comprises the following steps:
Step 1, using sedimentation on fibre core (1) sedimentary inner envoloping layer (2), then, then on inner cladding (2) deposit surrounding layer
(3), preform to be sintered is formed；
Preform is carried out high temperature sintering, forms preform to be drawn by step 2；
Preform is carried out wire drawing, while axially being rotated along preform by step 3, its screw pitch range is made to exist
In 0.05-10mm, the preparation of optical fiber is completed.
10. the preparation method of the optical fiber according to claim 9 kept for vortex beams transmission, it is characterised in that:
In step 1, the sedimentation is Modified Chemical Vapor Deposition method, heating furnace chemical vapour deposition technique, Both Plasma Chemical Vapor are heavy
One of area method, outside vapor deposition, axial vapor deposition method and atomic layer deposition method or any combination.
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Cited By (5)
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| CN109683239A (en) * | 2019-01-23 | 2019-04-26 | 上海交通大学 | Vector vortex beams radiator and its application in photon integrated chip |
| CN110247291A (en) * | 2019-06-11 | 2019-09-17 | 上海大学 | A kind of PbS annular core fibre and preparation method thereof amplifying OAM light beam |
| CN111562649A (en) * | 2020-06-11 | 2020-08-21 | 南开大学 | Vortex light dispersion compensation optical fiber |
| CN113036584A (en) * | 2021-03-02 | 2021-06-25 | 江苏科技大学 | Ultrashort pulse vortex light beam generating device |
| CN114200572A (en) * | 2020-09-17 | 2022-03-18 | 南开大学 | Vortex light non-zero dispersion displacement optical fiber |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109683239A (en) * | 2019-01-23 | 2019-04-26 | 上海交通大学 | Vector vortex beams radiator and its application in photon integrated chip |
| CN109683239B (en) * | 2019-01-23 | 2023-09-12 | 上海交大知识产权管理有限公司 | Vector vortex beam radiator in photon integrated chip and application thereof |
| CN110247291A (en) * | 2019-06-11 | 2019-09-17 | 上海大学 | A kind of PbS annular core fibre and preparation method thereof amplifying OAM light beam |
| CN110247291B (en) * | 2019-06-11 | 2021-07-20 | 上海大学 | PbS annular core optical fiber for amplifying OAM light beam and preparation method thereof |
| CN111562649A (en) * | 2020-06-11 | 2020-08-21 | 南开大学 | Vortex light dispersion compensation optical fiber |
| CN111562649B (en) * | 2020-06-11 | 2022-04-12 | 南开大学 | Vortex light dispersion compensation optical fiber |
| CN114200572A (en) * | 2020-09-17 | 2022-03-18 | 南开大学 | Vortex light non-zero dispersion displacement optical fiber |
| CN114200572B (en) * | 2020-09-17 | 2024-05-14 | 南开大学 | Vortex light non-zero dispersion displacement optical fiber |
| CN113036584A (en) * | 2021-03-02 | 2021-06-25 | 江苏科技大学 | Ultrashort pulse vortex light beam generating device |
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Application publication date: 20181228 |