CN106597601A - Microstructural low birefringence optical fiber and manufacturing method thereof - Google Patents
Microstructural low birefringence optical fiber and manufacturing method thereof Download PDFInfo
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- CN106597601A CN106597601A CN201510683164.3A CN201510683164A CN106597601A CN 106597601 A CN106597601 A CN 106597601A CN 201510683164 A CN201510683164 A CN 201510683164A CN 106597601 A CN106597601 A CN 106597601A
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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
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02342—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by cladding features, i.e. light confining region
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01211—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
- C03B37/0122—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube for making preforms of photonic crystal, microstructured or holey optical fibres
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
- C03B37/02709—Polarisation maintaining fibres, e.g. PM, PANDA, bi-refringent optical fibres
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
- C03B37/02745—Fibres having rotational spin around the central longitudinal axis, e.g. alternating +/- spin to reduce polarisation mode dispersion
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/10—Internal structure or shape details
- C03B2203/18—Axial perturbations, e.g. in refractive index or composition
- C03B2203/20—Axial perturbations, e.g. in refractive index or composition helical
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/30—Polarisation maintaining [PM], i.e. birefringent products, e.g. with elliptical core, by use of stress rods, "PANDA" type fibres
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/06—Rotating the fibre fibre about its longitudinal axis
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- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Dispersion Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The present invention discloses a microstructural low birefringence optical fiber and a manufacturing method thereof. The fiber comprises an optical fiber ferrule, a fiber core and an air cladding. The fiber core comprises a fiber core rod and two hollow pipes, and the fiber core rod is located at the center of the optical fiber ferrule. The air cladding is composed of a plurality of capillary hollow pipes with the same diameter, and the capillary hollow pipes are uniformly distributed around the fiber core. The two hollow pipes are respectively located at two sides of the fiber core rod and are symmetrically distributed. The microstructural low birefringence optical fiber takes one end face as an initial surface, and the internal structure of the microstructural low birefringence optical fiber has a spiral structure. The rotary microstructural fiber of the microstructural low birefringence optical fiber is formed through geometrical birefringence, has no stressed zone and only has the single material so as to solve the problem of the thermal expansion coefficient difference of a plurality of materials of the stressed zone optical fiber. The microstructural low birefringence optical fiber does not need a large-scale chemical deposition lathe so as to reduce the production technology process.
Description
Technical field
The invention belongs to microstructured optical fibers making field, more particularly to a kind of micro-structural low birefringent fiber and preparation method thereof.
Background technology
Low birefringence fiber optic applications have begun to the eighties in current transformer in eighties of last century.It is generally adopted by rotation real
Core High Linear polarization maintaining optical fibre is preparing low birefringent fiber.But due to including several material in the structure of traditional polarization maintaining optical fibre
Material, such as：Main material in panda protecting polarized light fiber is the quartz glass as fibre cladding, and the material of fibre core contains germanium, fine
There is the boron rod of symmetric arrays on the both sides of core, and the coefficient of thermal expansion of this different materials is different, if this optical fiber is in use
There is the quick change of temperature, fibre core leaded light performance can change because thermal coefficient of expansion is different, and then final impact transmission
Optical signal, causes the error tested.In addition, traditional handicraft needs chemical deposition lathe, manufacturing cost is higher.
The content of the invention
The present invention is directed to the easy temperature influence of existing real core polarization maintaining optical fibre, and working in the state of transformation temperature can affect optical signal
A kind of problem of normal transmission, there is provided micro-structural low birefringent fiber and preparation method thereof, micro-structural low birefringent light of the present invention
Fibre is formed by geometry birefringence, unstressed area, only homogenous material, the multiple material thermal expansion of such stress zone type optical fiber
The problem of difference of coefficients is just resolved.Also without large-scale chemical deposition lathe, the technological process of production is reduced.
The technical solution adopted for the present invention to solve the technical problems is：A kind of micro-structural low birefringent fiber, including light are provided
Fiber coating pipe, fibre core, air cladding layer, fibre core includes core rod, 2 hollow pipes, and core rod is located at the centre of ferrule,
Air cladding layer is made up of some diameter identical capillary hollow pipes, and capillary hollow pipe is uniformly laid in the periphery of fibre core；2 skies
Heart pipe positioned at the both sides of core rod, is symmetric respectively；The micro-structural low birefringent fiber with one end face as initial surface,
Internal structure structure in the shape of a spiral.
By above-mentioned technical proposal, ferrule, core rod, hollow pipe, the material of capillary hollow pipe are same guide-lighting material.
By above-mentioned technical proposal, ferrule, core rod, hollow pipe, the material of capillary hollow pipe are quartz glass.
By above-mentioned technical proposal, rectangular hexagonal structure is stacked into as air by a diameter of 2～5 μm of capillary hollow pipe
Covering, a diameter of 7～10 μm of 2 hollow pipes.
The present invention also provides a kind of preparation method of micro-structural low birefringent fiber, comprises the following steps, step one, by row
Tube method prepares prefabricated rods；Step 2, prefabricated rods is drawn and is bored, and draws preform diameter before cone to be 15～50mm, draws pre- after cone
A diameter of 3～the 10mm of rod processed, (effect for drawing cone is solidification prefabricated rods, and in prefabricated rods prepared by comb method, capillary hollow pipe is all
It is arranged in parallel and adjacent contact, prefabricated rods are drawn into the still smaller prefabricated rods of equal proportion and are claimed by wire-drawer-tower high-temperature
For draw cone.During this, the leaded light material experience such as quartz glass is melted and is solidified again, and each adjacent capillary exists
Link together during this)；Step 3, will draw the prefabricated rods after cone to be placed on the second sleeve pipe, and prefabricated rods integral-rotation is same
Shi Lasi becomes optical fiber, makes the inside of optical fibre structure of pull-out with spiral status, and from wire-drawing temperature glassy state temperature is dropped to,
Spiral status are Structured cured in inside of optical fibre.
By above-mentioned technical proposal, in the step 3, in rotation drawing process, the prefabricated rods after cone will be drawn to be fixed on optical fiber
Chuck on tower increases on rotation motor, and chuck increases rotation motor and enters high temperature furnace for controlling prefabricated rods, to heating furnace
During interior push, rotation motor rotates clockwise or counter-clockwise prefabricated rods.Inside micro-structural low birefringent fiber
In screw type micro-structural, helix pitch is long less than the bat of the optical fiber.Micro-structural low birefringent fiber is by micro-structural high birefringence
Fiber spinning wire drawing is obtained, such as：The bat length of micro-structural high birefringence optical fiber is 2mm, and helix pitch should be less than or be much smaller than
2mm.The ratio of prefabricated rods rotary speed and fiber draw speeds determines the size of helix pitch, and rotary speed can be every from 0 turn
Minute to 2000 rpms, fiber draw speeds it is general 1 meter it is per minute following.
By above-mentioned technical proposal, in the step one, comb method prepare prefabricated rods specifically include, by quartz glass bar, 2
Quartz-glass hollow pipe, quartz glass capillary are fixed on the inside of quartz glass outer tube, and wherein quartz glass bar is fixed on
The centre of quartz glass outer tube, 2 quartz-glass hollow pipes are symmetric respectively positioned at the both sides of quartz glass bar；
Quartz glass capillary is uniformly laid in the periphery of quartz glass bar and 2 quartz-glass hollow pipes.
By above-mentioned technical proposal, drawing cone and rotating in drawing process, the air pressure controlled in 2 quartz-glass hollow pipes is identical,
And in the range of 10～50 millibars (2000 degrees Celsius), while the air pressure controlled in each quartz glass capillary is identical,
And in the range of 1～30 millibar (2000 degrees Celsius).
The beneficial effect comprise that：This rotation microstructured optical fibers of micro-structural low birefringent fiber of the present invention are to pass through
Geometry birefringence is formed, unstressed area, only homogenous material, the multiple material coefficient of thermal expansion differences of such stress zone type optical fiber
Different problem is just resolved.Also without large-scale chemical deposition lathe, the technological process of production is reduced.
Description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is micro-structural high birefringence optical fiber structural representation；
Fig. 2 is the structural representation of embodiment of the present invention micro-structural low birefringent fiber.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, to this
Invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
In the embodiment of the present invention, there is provided a kind of micro-structural low birefringent fiber, including ferrule, fibre core, air cladding layer,
Fibre core includes core rod, 2 hollow pipes, and core rod is located at the centre of ferrule, and air cladding layer is identical by some diameters
Capillary hollow pipe composition, capillary hollow pipe is uniformly laid in the periphery of fibre core；2 hollow pipes are respectively positioned at the two of core rod
Side, is symmetric；The micro-structural low birefringent fiber with one end face as initial surface, internal structure structure in the shape of a spiral.
Further, ferrule, core rod, hollow pipe, the material of capillary hollow pipe are same guide-lighting material.
Further, ferrule, core rod, hollow pipe, the material of capillary hollow pipe are quartz glass.
In the embodiment of the present invention, further, a diameter of 2～5 μm of capillary hollow pipe, rectangular hexagon knot is stacked into
Structure as air cladding layer, a diameter of 7～10 μm of 2 hollow pipes.
In the embodiment of the present invention, a kind of preparation method of micro-structural low birefringent fiber is also provided, comprised the following steps, step
One, prefabricated rods are prepared by comb method；Step 2, prefabricated rods is drawn and is bored, and draws preform diameter before cone to be 15～50mm,
Preform diameter after cone is drawn to be 3～10mm, the effect for drawing cone is solidification prefabricated rods, in prefabricated rods prepared by comb method, hair
Thin hollow pipe is all arranged in parallel and adjacent contact, and but prefabricated rods are drawn into equal proportion smaller by wire-drawer-tower high-temperature
Prefabricated rods referred to as draw cone.During this, the leaded light material experience such as quartz glass is melted and is solidified again, and each is adjacent
Capillary link together in this process；Step 3, will draw the prefabricated rods after cone to be placed on the second sleeve pipe, prefabricated rods
Integral-rotation wire drawing simultaneously becomes optical fiber, makes the inside of optical fibre structure of pull-out with spiral status, and from wire-drawing temperature glass is dropped to
Glass state temperature, spiral status are Structured cured in inside of optical fibre, as shown in Figure 2.
Further, in the step 3, in rotation drawing process, the prefabricated rods after cone will be drawn to be fixed on optical fiber tap
Chuck increases on rotation motor, and chuck increases rotation motor and enters high temperature furnace for controlling prefabricated rods, is pushing into heating furnace
During, rotation motor rotates clockwise or counter-clockwise prefabricated rods.Screw type inside micro-structural low birefringent fiber
In micro-structural, helix pitch is long less than the bat of the optical fiber.Such as：Micro-structural high birefringence optical fiber (micro-structural low birefringent fiber
To rotate wire drawing by micro-structural high birefringence optical fiber to obtain) bat length be 2mm, helix pitch should be less than or much smaller than 2mm.
The ratio of prefabricated rods rotary speed and fiber draw speeds determines the size of helix pitch, and rotary speed can be from 0 rpm
To 2000 rpms, fiber draw speeds it is general 1 meter it is per minute following.
In the embodiment of the present invention, further, in the step one, comb method prepares prefabricated rods and specifically includes, by quartzy glass
Glass rod, 2 quartz-glass hollow pipes, quartz glass capillary are fixed on the inside of quartz glass outer tube, wherein quartzy glass
Glass rod is fixed on the centre of quartz glass outer tube, and 2 quartz-glass hollow pipes are located at respectively the both sides of quartz glass bar,
It is symmetric；Quartz glass capillary 1 is uniformly laid in the periphery of quartz glass bar and 2 quartz-glass hollow pipes, such as
Shown in Fig. 1.
Further, drawing cone and rotating in drawing process, the air pressure controlled in 2 quartz-glass hollow pipes is identical, and
In the range of 10～50 millibars (2000 degrees Celsius), while the air pressure controlled in each quartz glass capillary is identical, and 1～
In the range of 30 millibars (2000 degrees Celsius).
Embodiment of the present invention micro-structural low birefringent fiber includes covering, fibre core, ferrule, and the cross section of fibre core is ellipse
Shape, ferrule, covering are identical with fibre core material.See on fiber cross-sections, core rod is located at the centre of ferrule, empty
Gas bag layer is made up of some diameter identical capillary hollow pipes, and capillary hollow pipe is uniformly laid in the periphery of fibre core；2 hollow
Pipe positioned at the both sides of core rod, is symmetric respectively, is geometric type high birefringence optical fiber.Rotate during wire drawing pre-
Rod processed, makes the cross section of optical fiber with one end face as initial surface, internal structure structure in the shape of a spiral, becomes circular-polarization optical fiber.
This optical fiber is compared to electromagnetism field sensitive with traditional polarization maintaining optical fibre, and this rotation of micro-structural low birefringent fiber of the present invention is micro-
Structured optical fiber is formed by geometry birefringence, unstressed area, only homogenous material, various materials of such stress zone type optical fiber
The problem of material thermal expansion coefficient difference is just resolved.Also without large-scale chemical deposition lathe, production technology stream is reduced
Journey.
Microstructured optical fibers are a class special construction optical fiber, are the hollow holes of real core fibre fiber core periodic arrangement as covering
Optical fiber, realize the homogenous material of optical fiber；And can pass through adjustment covering airport size, control fibre-optical dispersion and
Improve the high non-linearity effect of optical fiber.Low birefringent fiber be by the high birefringence optical fiber prefabricated rods of rotating linear polarization state come
What wire drawing was realized, such as：Bow-tie type polarization maintaining optical fibre is prepared into low birefringent fiber by rotating prefabricated stick drawn wire.Low-birefringence
Optical fiber can be applicable to current sensor application.Impact of traditional real core polarization maintaining optical fibre to temperature is more sensitive, in transformation temperature
In the state of work can cause test error.And the covering of microstructured optical fibers is air, simultaneously because homogenous material optical fiber,
Reduce sensitivity of the fibre core to temperature, the sensing unit as current sensor preferably.The present invention is proposed by rotating wire drawing
Air cladding layer microstructured optical fibers are prepared, for current sensor.
Embodiment of the present invention micro-structural low birefringent fiber is prepared by the rotation high birefringence optical fiber prefabricated rods in drawing process
Form.The composition of high birefringence optical fiber is：Fiber core covering is the pore of periodic arrangement, the μ of capillary bore dia 2～5
M, because the centre of pore is air, covering pore has relatively low refractive index compared with fibre core, forms waveguide.It is adjacent with fibre core
The symmetrical pore in both sides replaced by two bigger airports of hollow hole, 7～10 μm of air bore dia makes fibre core into ellipse
Polarization state that is circular and keeping light.The microstructured optical fibers such as microstructured optical fibers only have a kind of glass material, and what temperature was caused is hot swollen
It is swollen to produce big internal stress.It is to be based on that the rotation wire drawing microstructured optical fibers that this patent is proposed prepare low birefringence optical fiber
This high birefringence optical fiber.
In presently preferred embodiments of the present invention, the prefabricated rods of micro-structural low birefringent fiber are completed by comb method, outside set
Pipe and internal capillary are pure quartz glass.The size of capillary is typically 1mm diameters, and Close stack is into rectangular six
Side shape structure is used as covering.The wall thickness of capillary, also referred to as dutycycle, need to be prepared according to the characteristics of fiber optic applications, such as：
80% dutycycle is that inside of optical fibre has 80% air.The interior outside of capillary needs to use after hydrofluoric acid clean, nitrogen purging
It is dried.Microstructured optical fibers are needed in clean room work, because possible impurity and dust can increase scattering loss and the shadow of optical fiber
Ring to light intensity.The number of plies of air cladding layer influences whether the loss of optical fiber, more multilayer, and the loss of optical fiber can be relatively low, instead
Loss it is high.The air cladding layer number of plies can be 2-10 layers, and 3-5 layers covering can be such that the loss of optical fiber reaches below 2dB/ kilometers,
Simultaneously manufacturing process is relatively easy.The drawing process of micro-structural low birefringent fiber need control each airport in pressure and
Avoid airport deformation.The symmetrical hollow pipe in central core both sides needs higher pressure to control its symmetry, at 2000 degrees Celsius
Preparation temperature under, pressure takes around 10-50 millibars；The little capillary of periphery needs relatively low pressure control,
Under 2000 degrees Celsius of preparation temperature, pressure needs 1-30 millibars.The fibre core of High Linear polarization state microstructured optical fibers is oval
Shape, oval fibre core has a very strong birefringence, so by using elliptical core long and short edge lengths difference structure, pass
Lose the refractive index control for realizing polarization state different with the refractive index of vertical minor face transmitted from the long side of ellipse fibre core.It is logical
The manufacturing process of rotation prefabricated rods is crossed, the optical fiber of linear polarization state can be become circular polarization state.
By once drawing cone technique, i.e., preform prepared by comb method needs:Larger-size prefabricated rods, such as 20～
50mm diameters, make the less prefabricated rods of size, such as 3～20mm diameters.The effect for drawing cone is to solidify prefabricated rods, comb method
In the prefabricated rods of preparation, capillary is all arranged in parallel and adjacent contact, and prefabricated rods are drawn into by wire-drawer-tower high-temperature
The still smaller prefabricated rods of ratio referred to as draw cone.During this, glass experience is melted and is solidified again, and each is adjacent
Capillary link together draw the prefabricated rods after cone to be placed in another quartz ampoule and carry out rotation wire drawing in this process.Rotation
It is the rotation motor that prefabricated rods are fixed on optical fiber tap to turn wire drawing, during slowly pushing toward in heating furnace, rotates horse
Up to prefabricated rods are rotated clockwise or counter-clockwise, the optical fiber that bottom pulls out is with spiral status, rapidly from 2000 degree or so
Wire-drawing temperature drop to glassy state temperature and once solidify, helical structure is solidificated in inside of optical fibre.
Micro-structural high birefringence optical fiber structure such as Fig. 1, covering is closely according to the airport of periodic arrangement, quartz glass wool
The center of tubule 1 to the distance definition at adjacent quartz glass capillary center is:Λ.Fiber lengths l is regarded as endless.
Fibre diameter d, standard traffic fibre diameter is 125 μm, selects 125 μm since it is considered that the mechanical performance of optical fiber.And light
The size of fine ring polarization maintaining optical fibre can be 80 μm, can so manufacture smaller gyro.Quartz-glass hollow pipe 4
With the size of quartz-glass hollow pipe 5 determined according to optical fiber property.Such as, the size and spacing of quartz-glass hollow pipe are changed
The dispersion and loss of control optical fiber.Quartz glass capillary 1 is smaller in size than quartz-glass hollow pipe 4 and quartz-glass hollow
Pipe 5.Quartz-glass hollow pipe 4 and quartz-glass hollow pipe 5 are, quartz-glass hollows axisymmetric relative to fiber optic hub
The diameter of pipe 4 and quartz-glass hollow pipe 5 determines the major axis and the ratio of short axle of oval fibre core 3, such as:The quartz of major diameter
Glass hollow pipe 4 and quartz-glass hollow pipe 5, oval fibre core can be flat, i.e. the ratio of major axis and short axle is big；Otherwise major axis
It is little with the ratio of short axle.
As shown in Fig. 2 after rotation, the structure composition of embodiment of the present invention micro-structural low birefringent fiber is as follows：Due to
Rotation drawing process, the quartz-glass hollow pipe of surrounding, quartz glass capillary are in the spiral after clockwise or counterclockwise
The oval fibre core 6 of state quartz-glass hollow pipe 9, quartz glass capillary 7, also spiral status, but optical fiber one end
The figure in face keeps Central Symmetry.Optical fiber prolongs central shaft or clockwise or counterclockwise, the angle speed of drawing process control rotation
Spend to control helix pitch.As high speed spin fiber prefabricated rods can obtain fine and closely woven helix pitch, conversely, compared with the rotation of low speed
Turn to obtain sparse helix pitch.Length l and diameter d of optical fiber should be not changed in after rotation wire drawing, this is because can
To control the movement velocity and drawing speed of prefabricated rods, constant rate is kept, the diameter of optical fiber is also constant.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or be converted, and
All these modifications and variations should all belong to the protection domain of claims of the present invention.
Claims (8)
1. a kind of micro-structural low birefringent fiber, it is characterised in that including ferrule, fibre core, air cladding layer, fibre core
Including core rod, 2 hollow pipes, core rod is located at the centre of ferrule, and air cladding layer is by some diameter identical hairs
Thin hollow pipe composition, capillary hollow pipe is uniformly laid in the periphery of fibre core；2 hollow pipes are located at respectively the both sides of core rod,
It is symmetric；The micro-structural low birefringent fiber with one end face as initial surface, internal structure structure in the shape of a spiral.
2. micro-structural low birefringent fiber according to claim 1, it is characterised in that ferrule, core rod,
Hollow pipe, the material of capillary hollow pipe are same guide-lighting material.
3. micro-structural low birefringent fiber according to claim 2, it is characterised in that ferrule, core rod,
Hollow pipe, the material of capillary hollow pipe are quartz glass.
4. micro-structural low birefringent fiber according to claim 1 and 2, it is characterised in that capillary hollow pipe it is straight
Footpath is 2～5 μm, is stacked into rectangular hexagonal structure as air cladding layer, a diameter of 7～10 μm of 2 hollow pipes.
5. a kind of preparation method of micro-structural low birefringent fiber, it is characterised in that comprise the following steps, step one, leads to
Cross comb method and prepare prefabricated rods；Step 2, prefabricated rods is drawn and is bored, and draws preform diameter before cone to be 15～50mm, draws cone
Afterwards preform diameter is 3～10mm；Step 3, will draw the prefabricated rods after cone to be placed on the second sleeve pipe, prefabricated rods integral-rotation
Wire drawing simultaneously becomes optical fiber, makes the inside of optical fibre structure of pull-out with spiral status, and from wire-drawing temperature glassy state temperature is dropped to,
Spiral status are Structured cured in inside of optical fibre.
6. the preparation method of micro-structural low birefringent fiber according to claim 5, it is characterised in that the step
In three, in rotation drawing process, the chuck for drawing the prefabricated rods after cone to be fixed on optical fiber tap is increased on rotation motor, card
Disk increases rotation motor and enters high temperature furnace for controlling prefabricated rods, and during pushing into heating furnace, rotation motor makes pre-
Rod processed is rotated clockwise or counter-clockwise.
7. the preparation method of the micro-structural low birefringent fiber according to claim 5 or 6, it is characterised in that described
In step one, comb method prepares prefabricated rods and specifically includes, by quartz glass bar, 2 quartz-glass hollow pipes, quartz glass
Capillary is fixed on the inside of quartz glass outer tube, and wherein quartz glass bar is fixed on the centre of quartz glass outer tube, and 2
Individual quartz-glass hollow pipe positioned at the both sides of quartz glass bar, is symmetric respectively；Quartz glass capillary is uniformly laid in
The periphery of quartz glass bar and 2 quartz-glass hollow pipes.
8. the preparation method of the micro-structural low birefringent fiber according to claim 5 or 6, it is characterised in that drawing
In cone and rotation drawing process, the air pressure controlled in 2 quartz-glass hollow pipes is identical, and in the range of 10～50 millibars,
The air pressure for controlling in each quartz glass capillary simultaneously is identical, and in the range of 1～30 millibar.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107608020A (en) * | 2017-10-11 | 2018-01-19 | 佛山杰致信息科技有限公司 | The preparation method of polymer photon crystal fiber |
| CN109116465A (en) * | 2018-08-06 | 2019-01-01 | 武汉安扬激光技术有限责任公司 | A kind of Bragg grating type hollow-core fiber and preparation method thereof |
| 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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| 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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| CN111977959A (en) * | 2020-08-25 | 2020-11-24 | 东北大学 | V-shaped high birefringent microstructure optical fiber with air hole size controlled by air pressure and manufacturing method thereof |
| CN111977957A (en) * | 2020-08-25 | 2020-11-24 | 东北大学 | Gas pressure maintaining regulation and control device, microstructure optical fiber and preparation method of microstructure optical fiber |
| CN111977957B (en) * | 2020-08-25 | 2021-10-22 | 东北大学 | Gas pressure maintaining regulation and control device, microstructure optical fiber and preparation method of microstructure optical fiber |
| CN111977959B (en) * | 2020-08-25 | 2021-10-22 | 东北大学 | V-shaped high birefringent microstructure optical fiber with air hole size controlled by air pressure and manufacturing method thereof |
| CN115072983A (en) * | 2022-06-10 | 2022-09-20 | 武汉长盈通光电技术股份有限公司 | Preparation method of hollow anti-resonance optical fiber intermediate prefabricated rod |
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