CN107311445A - A kind of polarization-preserving fiber preform - Google Patents
A kind of polarization-preserving fiber preform Download PDFInfo
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- CN107311445A CN107311445A CN201710690032.2A CN201710690032A CN107311445A CN 107311445 A CN107311445 A CN 107311445A CN 201710690032 A CN201710690032 A CN 201710690032A CN 107311445 A CN107311445 A CN 107311445A
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- section
- wire drawing
- polarization
- enlarging
- tailpipe
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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
-
- 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
Abstract
The present invention relates to a kind of polarization-preserving fiber preform, prefabricated rods include wire drawing preformation cone reducing deformation section, the top of wire drawing preformation cone reducing deformation section designs for perforate, during wire drawing is turned around, it can discharge and be closed heated gas, the expansion bubbling of head end is prevented, the wire-drawing technology technique in disymmetry hole is realized.Prefabricated rods include tail pipe extension enlarging wire drawing gripping section simultaneously, by carrying out enlarging to the tail end for extending tailpipe section, variable diameter design can be carried out to the tail end for extending tail pipe, so as to realize the suspension holding function during holding function and cleaning-drying in its drawing process, optimize the circulation disposing capacity of each operation, ensure in suspension, cleaning, the operational sequences such as wire drawing clamping, the damage and pollution of wire drawing effective coverage are not caused, also need to design frosted radiating segment in the tail end close to extension tailpipe section, during wire drawing is clamped, heat of high temperature in fiber drawing furnace is obstructed, prevent collet segment heat conduction from overheating, Damage Coutrol part.
Description
Technical field
The present invention relates to a kind of polarization-preserving fiber preform, belong to technical field of optical fiber.
Background technology
Polarization maintaining optical fibre, i.e. polarization-maintaining fiber, for transmitting linearly polarized light, are widely used in space flight, aviation, navigation, industry
The every field of the national economy such as manufacturing technology and communication, the interferometric optical fiber sensor based on being detected by optical coherence
In, it ensure that linear polarization is constant using polarization maintaining optical fibre, improve relevant signal to noise ratio, to realize the high accuracy survey to physical quantity
Amount；Polarization maintaining optical fibre is mainly used in optical fiber current mutual inductor as a kind of special optical fiber, and optical fibre gyro, fibre optic hydrophone etc. is passed
The optical fiber telecommunications system such as sensor and DWDM, EDFA, is a kind of special optical fiber type having extensively using value.Stress birfringence
Polarization maintaining optical fibre mainly has bow-tie type polarization maintaining optical fibre, panda type polarization-preserving fiber and oval three kinds of cladding type polarization maintaining optical fibre.Wherein, panda
Type polarization maintaining optical fibre is applied the most extensive, and its structure includes fibre core, stressed zone and clad section, and its fibre core is located at the center of covering
Part, and two columned stressed zones are distributed in the both sides of fibre core, so as to produce so-called stress birfringence so that polarization-maintaining light
Fibre has linear polarization retention property.In design, the structure and stress mainly by two symmetrical cylinder stressed zones of change are adulterated
It is adjusted come the birefringenct property to polarization maintaining optical fibre.
A kind of preparation method of polarization maintaining optical fibre is described in Chinese patent 201610412177.1, is noted using prefabricated mould
Enter silica liquid, obtain quartz and partly cut sleeve pipe, melted by polishing, reinject the mixing of silica and diboron trioxide
Powder combinations are into panda type polarization-preserving fiber prefabricated rods；The specific design structure snd size parameter to prefabricated rods is not retouched in detail
State, the moulding prefabricated rod for being directly available for wire drawing is not provided yet.A kind of panda is described in Chinese patent 201610457293.5
The preparation method of polarization-preserving fiber preform, is added to rare earth using nanoporous silica powder and is co-doped with cationic inorganic salting liquid
Middle formation suspension, specific moulding prefabricated rod parameter is not provided and wire drawing prefabricated rods are available for.In Chinese patent
A kind of oval core panda protecting polarized light fiber and preparation method thereof is described in 201610599525.0, using flat polishing stretching to pre-
Rod processed is molded, and the structure design to prefabricated rods radial direction and parameter designing do not carry out detail specification, the design of this part yet
There is the influence of key to follow-up fibre-optical drawing.A kind of polarization-maintaining light is described in Chinese patent 201310658276.4
The manufacture device and manufacture method of fine prefabricated rods, carry out assembling fixation, equally using outer spray using design device to prefabricated component
Method prepares panda protecting polarized light fiber prefabricated rods, and the design and preparation of prefabricated rods are not carried out by the way of prefabricated punching.In
A kind of manufacture method of polarization maintaining optical fibre, but the structure only to bow-tie type polarization maintaining optical fibre are described in state's patent 201510017430.9
Design is described, while employing not rounded package assembly carries out assembly, has than larger gap.In Chinese patent
A kind of manufacture method of polarization maintaining optical fibre is described in 200410012671.6, a kind of panda type polarization-preserving fiber is mainly described pre-
The assembling method of rod processed, employs square core design, the stress structure that is relatively hard to keep on circular and square composition surface design；Simultaneously
Prefabricated rods detailed construction design parameter is not described yet.A kind of polarization maintaining optical fibre is described in Chinese patent 200810197409.1
Manufacture method, mainly describe to punch panda type polarization-preserving fiber the cylindrical finishing of prefabricated rods so that stress rods and hole
Gap, can be compensated by cylindrical finishing, so as to ensure the non-circularity of cladding of polarization maintaining optical fibre, while ensuring mechanical strength
Deterioration is not received；The wire drawing extension to prefabricated rods does not draw the technique of cone section to be described, and fails to propose to solve from technological design
The method of fiber cladding noncircularity optimization, adds manufacturing process, improves quality control risk.
The content of the invention
It is an object of the invention to overcome above-mentioned deficiency there is provided a kind of polarization-preserving fiber preform, bear on the one hand disclosure satisfy that
The design requirement of the structural behaviour of cat type polarization maintaining optical fibre, on the other hand carries out in detail prefabricated for specific fibre-optical drawing link
Rod radial configuration and the complete design of dimensional parameters are to optimize the reality that the design of integrated molding prefabricated rods completes wire drawing optical fiber parameter
It is existing.The production that can directly carry out panda type polarization-preserving fiber using the prefabricated rods finished product of the present invention is drawn, it is to avoid in drawing process
Limitation is implemented in deterioration, malformation and the operation of fiber cladding noncircularity, reaches wire drawing optical fiber parameter index request, improves simultaneously
The production output capacity of prefabricated stick drawn wire.
The object of the present invention is achieved like this：
A kind of polarization-preserving fiber preform, the wire drawing that it includes punching wire drawing into fine section, extension tailpipe section, tail pipe extension enlarging is clamped
The deformation section of section, wire drawing preformation cone reducing；
Wherein punching wire drawing includes fibre core and clad section into fine section, and the clad section is coated on fibre core periphery, and covering
Symmetrical diplopore is additionally provided with part, the symmetrical diplopore is arranged symmetrically relative to fibre core；
The extension tailpipe section, into fine section rear portion, extends tailpipe section and punching wire drawing parallel, wire drawing into fine section located at punching wire drawing
Gripping section is the tail end part for extending tailpipe section, and wire drawing gripping section is in horn-like, and its outside bore is more than inner side bore, described
The deformation section of wire drawing preformation cone reducing is the head end part for punching wire drawing into fine section, and deformation section is in horn-like, its outside bore
Less than inner side bore, the top conehead of deformation section is designed using opening, and its surface is diplopore opening surface, extends tailpipe section in addition
Frosted radiating segment is being additionally provided with by near caudal end part.
The cone deformed area top end diameter D6 ∈ of the deformation section（1mm, 12mm）, the cone deformed area transition length L6 of deformation section
∈（40mm, 80mm）, the top conehead of deformation section is using opening design, it is desirable to the diameter D8 ∈ of symmetrical diplopore opening surface
（1mm, 5mm）.
The wire drawing gripping section enlarging tail end diameter D5 ∈（32mm, 65mm）.
The length L7 ∈ of the frosted radiating segment（10mm, 200mm）, frosted radiating segment central point and tail pipe extension enlarging are drawn
Silk gripping section enlarging caudal end apart from L57 ∈（200mm, 500mm）.
The bore D4 ∈ of the extension tailpipe section（22mm, 58mm）, length L4 ∈（300mm, 800mm）, extend tail pipe
The pipe external diameter of section is consistent with the size for the long rod outside diameter D1 that prefabricated stick drawn wire punches into fine section, D1 ∈（30mm, 60mm）.
The diameter D2 ∈ of the fibre core（1mm, 5mm）, length L1 ∈（200mm, 600mm）, the diameter D3 ∈ of symmetrical diplopore
（10mm, 20mm）, the diplopore inset spacing T2 ∈ of symmetrical diplopore（1.5mm, 10mm）, wire drawing is into fine section（101）Outer circumferential edge with it is right
Claim the back gauge T3 ∈ of the hole outer circumferential edge of diplopore（2mm, 5mm）.
The extension tailpipe section is docked using flame or electric furnace or plasma heating with punching wire drawing into fine section, is melted
Contracting together, forms the moulding prefabricated rod structure of integration.
Wire drawing gripping section carries out tail end heating by thermal source, then by the way of mechanical enlarging, realizes tail end enlarging, presss from both sides
Hold the function that prefabricated rods carry out wire drawing.
Deformation section carries out head end heating by thermal source, and the deformation knot that preformation bores reducer is carried out using the method for melting extension
Structure, realizes diplopore wire drawing variable diameter design.
Compared with prior art, the beneficial effects of the invention are as follows：
1st, prefabricated rods punch wire drawing and take preformation cone reducing fabrication design into the head end of fine section, to preparing wire drawing into the pre- of optical fiber
Rod processed has carried out the symmetrical diplopore extension preformation cone design processing of head end, so as to carry out shape to the reducing region of wire drawing prefabricated rods
Preforming, the conical design progress for guiding the punching plunger wire drawing section of the double slotting stress rods of symmetrical diplopore of rear end to be bored according to preformation
Deformation and reducing, so as to optimize the non-circularity of cladding parameter of wire drawing Formed Fiber, high-quality is reached in the case where not taking shaping
The optical fiber structure shape of non-circularity of cladding；
2nd, prefabricated rods punch wire drawing and take preformation cone reducing fabrication design into the head end of fine section, pass through the shape ratio of reducing deformation
The stress rods of twin jack have been carried out position and fixed, prevented displacement or tenesmus of the stress rods during wire drawing is turned around by example design,
Maintain the shape design of polarization maintaining optical fibre；
3rd, prefabricated rods punch wire drawing and take preformation cone reducing fabrication design into the head end of fine section, pass through opening for reducing deformation top
Design in hole, it is ensured that whole symmetrical diplopore insertion prefabricated rods are overall, form the unobstructed of air-flow, fall the cone stage in wire drawing, with pre-
Rod processed has got through the inflation channel of heated gas in the continuous rising of wire drawing in-furnace temperature, discharges the bulbs of pressure, prevents bubbling from frying
Cone has carried out position to the stress rods of twin jack and fixed, and prevents displacement or tenesmus of the stress rods during wire drawing is turned around, and keeps
The shape design of polarization maintaining optical fibre；
4th, the extension tailpipe section of prefabricated rods is docked with punching into fine section using thermals source such as flame, electric furnace, plasma heatings,
Ensure the firm of wire-drawing operation process, the tail end of extension tailpipe section takes the design of enlarging, passes through the size knot of enlarging tail end
Structure is designed so that whole wire-drawing shape prefabricated rods can be compressed during pickling, alkali cleaning, drying, hung, hung upside down
Operation, does not damage and pollutes effective drawing portion of punching wire drawing section.During wire drawing, folder rod can enter to flared end
Row clamping, so during large scale diplopore prefabricated stick drawn wire is carried out, will not can not be clamped because rod deadweight is excessive.
5th, the tail end of the extension tailpipe section of prefabricated rods takes enlarging and the design of radiating frosted section, passes through the frosted section that radiates
Length, distance etc. setting, the heat conduction of clamping device can be avoided, prevent the high temperature in fiber drawing furnace to be transmitted to clamping device
On, it is to avoid the heat ageing of electric controller, also prevent pipe interior sealing rubber ring by heat ageing.
6th, wire-drawing shape prefabricated rods described in the invention, can intactly realize the wire-drawing process of whole polarization maintaining optical fibre,
Optimize geometry and the mechanical strength properties such as non-circularity of cladding, proof strength, the wire drawing outage of drawing optical fiber, while ensuring polarization-maintaining
The polarization property of optical fiber.
Brief description of the drawings
Fig. 1 is a kind of overall structure sketch of polarization-preserving fiber preform of the invention.
Fig. 2 is a kind of tail end schematic side view of polarization maintaining optical fibre wire-drawing shape prefabricated rods of the invention.
Fig. 3 is the structural design drawing that a kind of tail end-side of polarization maintaining optical fibre wire-drawing shape prefabricated rods of the invention is regarded.
Wherein：Wire drawing is punched into fine section 101, fibre core 102, symmetrical diplopore 103, extension tailpipe section 104, wire drawing gripping section
105th, deformation section 106, radiating frosted section 107, diplopore opening surface 108, clad section 109.
Embodiment
Referring to figs. 1 to Fig. 3, the present invention provides a kind of polarization-preserving fiber preform, it include punching wire drawing into fine section 101, prolong
Stretch tailpipe section 104, the wire drawing gripping section 105 of tail pipe extension enlarging, the deformation section 106 of wire drawing preformation cone reducing.
Wherein punching wire drawing is the wire drawing main body of panda type polarization-preserving fiber wire-drawing shape prefabricated rods, main paragraph into fine section 101
Panda type polarization-preserving fiber can be drawn into, the punching wire drawing includes fibre core 102 and clad section 109, the cladding part into fine section 101
Divide 109 to be coated on the periphery of fibre core 102, and symmetrical diplopore 103 is additionally provided with clad section 109, the symmetrical diplopore 103 is relative
It is arranged symmetrically in fibre core 102, wherein fibre core 102 is doping silica core layers, and disymmetry punching is carried out in polarization maintaining optical fibre female rod, is realized
The structure of panda type, inserts the stress rods of design in female rod, and the optical fiber structure that panda type polarization-preserving fiber stress type can be achieved is set
Meter.
The extension tailpipe section 104 located at punching wire drawing into the fine rear portion of section 101, extension tailpipe section 104 and punching wire drawing into
Fine section 101 is parallel, and the extension tailpipe section 104 is using thermals source such as flame, electric furnace, plasma heatings with punching wire drawing into fine section
101 are docked, and collapsing together, forms the moulding prefabricated rod structure of integration, and tail pipe extends the wire drawing gripping section 105 of enlarging
It is the tail end part for extending tailpipe section 104, the wire drawing gripping section 105 of tail pipe extension enlarging is in horn-like, and its outside bore is big
In inner side bore, tail end heating is carried out by thermal source, then by the way of mechanical enlarging, tail end enlarging is realized, clamps prefabricated
Rod carries out the function of wire drawing, and the deformation section 106 of the wire drawing preformation cone reducing is the head end one for punching wire drawing into fine section 101
Point, the deformation section 106 of wire drawing preformation cone reducing is in horn-like, and its outside bore is less than inner side bore, and head end is carried out by thermal source
Heating, carries out the deformation structure that preformation bores reducer using the method for melting extension, realizes diplopore wire drawing variable diameter design, it is ensured that become
Footpath ratio meets technological requirement, reduces the geometric deformation of prefabricated rods, optimizes the non-circularity of cladding performance parameters of wire drawing optical fiber, wire drawing
The top conehead of the deformation section 106 of preformation cone reducing is designed using opening, and its surface is diplopore opening surface 108.
Wherein the deformation section 106 of wire drawing preformation cone reducing into the head end of fine section 101 to punching wire drawing by carrying out preformation cone
The design of reducing, can carry out pre-designed, the structural deformation journey of adjustment disymmetry pore structure to the process of prefabricated stick drawn wire reducing
Degree, it is ensured that in drawing process due to caused by surface tension symmetric double cellular deformation amount controlled.Preformation cone reducing
Design can effectively realize the installation of stress rods, block stress rods in head end, prevent displacement of the stress rods in drawing process, from
And ensure the realization of wire drawing stress birfringence.The top of the deformation section 106 of last wire drawing preformation cone reducing designs for perforate,
During wire drawing is turned around, panda type polarization-preserving fiber wire-drawing shape prefabricated rods head end can be discharged and be closed heated gas, prevented
Only the expansion bubbling of head end, realizes the wire-drawing technology technique in disymmetry hole.
The wire drawing gripping section 105 of tail pipe extension enlarging, can by the design of the tail end progress enlarging to extending tailpipe section 104
To carry out variable diameter design to the tail end for extending tail pipe, so that the holding function and cleaning in realizing the drawing process for extending tail pipe are dry
Suspension holding function during dry.Optimize the circulation disposing capacity of each operation, it is ensured that in behaviour such as suspension, cleaning, wire drawing clampings
Make process, the damage to prefabricated stick drawn wire effective coverage and pollution are not caused.
In addition extension tailpipe section 104 is being additionally provided with frosted radiating segment 107 by near caudal end part, and frosted radiating segment 107 is used for
During wire drawing is clamped, the heat of high temperature in fiber drawing furnace is obstructed, prevents collet segment heat conduction from overheating, Damage Coutrol device
Part.
Extend tailpipe section 104, tail pipe extension enlarging wire drawing gripping section 105, wire drawing preformation cone reducing deformation section 106,
Frosted radiating segment 107 is the collaborative design part of panda type polarization-preserving fiber wire-drawing shape prefabricated rods.
The deformation section 106 is made by carrying out preformation cone reducing processing into the head end of fine section 101 to punching wire drawing, wherein
The cone deformed area top end diameter D6 ∈ of deformation section 106（1mm, 12mm）, the cone deformed area transition length L6 ∈ of deformation section 106
（40mm, 80mm）, the top conehead of deformation section 106 is using opening design, it is desirable to the diameter D8 ∈ of symmetrical diplopore opening surface 108
（1mm, 5mm）.
The wire drawing gripping section 105 of the tail pipe extension enlarging to the tail end for extending tailpipe section 104 by carrying out expanding
It is made, wherein the enlarging tail end diameter D5 ∈ of tail pipe extension enlarging wire drawing gripping section 105（32mm, 65mm）.
The length L7 ∈ of the frosted radiating segment 107（10mm, 200mm）, the central point of frosted radiating segment 107 and tail pipe extend
The enlarging caudal end of enlarging wire drawing gripping section 105 apart from L57 ∈（200mm, 500mm）.
The bore D4 ∈ of the extension tailpipe section 104（22mm, 58mm）, length L4 ∈（300mm, 800mm）, extend tail
The size that pipe external diameter and the prefabricated stick drawn wire of pipeline section 104 punch into the long rod outside diameter D1 of fine section 101 is consistent, D1 ∈（30mm,
60mm）, punch wire drawing and use the progress pair of the thermals source such as flame, electric furnace, plasma heating with extension tailpipe section 104 into fine section 101
Connect, collapsing together, forms the moulding prefabricated rod structure of integration.
The diameter D2 ∈ of fibre core 102 of the punching wire drawing into fine section 101（1mm, 5mm）, length L1 ∈（200mm,
600mm）, the diameter D3 ∈ of symmetrical diplopore 103（10mm, 20mm）, symmetrical diplopore 103 of the prefabricated rods punching wire drawing into fine section 101
Diplopore inset spacing T2 ∈（1.5mm, 10mm）, prefabricated rods punch wire drawing into the outer circumferential edge of fine section 101 and the hole of symmetrical diplopore 103
The back gauge T3 ∈ of outer circumferential edge（2mm, 5mm）.
Punch wire drawing and carry out preformation cone reducing into the fine head end of section 101, tail end carries out the panda type polarization-maintaining of enlarging frosted design
The moulding prefabricated rod of drawing optical fibers, the punching wire drawing presses design requirement into the filling stress rods of symmetrical diplopore 103 of fine section 101, complete
Holohedral symmetry inserts in the hole, and forms stress type polarization-preserving fiber preform structure.Panda type polarization-preserving fiber finished product is made by wire drawing again.
The embodiment of the present invention 1：
Head end carries out preformation cone reducing, and tail end carries out the panda type polarization-preserving fiber wire-drawing shape prefabricated rods of enlarging frosted design.Bag
Include：
The cone deformed area top end diameter D6 of wire drawing preformation cone reducing deformation section 106 is 6mm, wire drawing preformation cone reducing deformation section 106
Cone deformed area transition length L6 be 30mm, the top conehead opening of wire drawing preformation cone reducing deformation section 106, symmetrical diplopore is opened
The diameter D8 in mouth face 108 is 2mm；The enlarging tail end diameter D5 of tail pipe extension enlarging wire drawing gripping section 105 is 43mm, frosted radiating segment
107 length L7 is 120mm, and the central point of frosted radiating segment 107 extends the enlarging caudal end of enlarging wire drawing gripping section 105 with tail pipe
Apart from L57 be 300mm；The bore D4 for extending tailpipe section 104 is 36mm, and length L4 is 600mm, extension tailpipe section 104
Pipe external diameter is consistent with the size for the long rod outside diameter D1 that prefabricated stick drawn wire punches into fine section 101, and D1 is 40mm, punches wire drawing into fine section
101 are docked with extension tailpipe section 104 using thermals source such as flame, electric furnace, plasma heatings, and collapsing together, forms one
The moulding prefabricated rod structure of body；It is 2.6mm that wire drawing, which is punched, into the diameter D2 of the fibre core 102 of fine section 101, and length L1 is 400mm,
The diameter D3 of symmetrical diplopore 103 is 13mm, and prefabricated rods punch wire drawing into the diplopore inset spacing T22 of the symmetrical diplopore 103 of fine section 101
For 4mm, prefabricated rods punch wire drawing into the outer circumferential edge of fine section 101 and the back gauge T31 of the hole outer circumferential edge of symmetrical diplopore 103 be 5mm.
Using above design structure parameter and preparation technology, double stress rods symmetric doubles are coordinated to insert, the stress that wire drawing is prepared
Type polarization maintaining optical fibre is a kind of structure of panda type polarization-preserving fiber, its main birefringenct property realized, the disconnected fine rate parameter of wire drawing, sieve
Select the fine length of intensity, single rod wire drawing, non-circularity of cladding parameter as follows：
Non-circularity of cladding：0.9%；
Single rod wire drawing is effectively fine long：55km；
Proof strength：100Kpsi；
Polarization crosstalk：- 30.2dB/km is reached in 1550nm operation wavelengths；
The embodiment of the present invention 2~6：
Using the preparation process described by embodiment 1 and technological process, preformation cone reducing is carried out by changing head end, tail end is carried out
The structure design of the functional areas such as enlarging, is made the panda type polarization-preserving fiber wire-drawing shape prefabricated rods of following 5 kinds of embodiments, and draws
Panda type polarization-preserving fiber product is made, its design structure is described in table 1 below with the wire drawing realized and optical fiber property parameter：
Table 1：
| Optical fiber parameter | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 |
| Wire drawing preformation cone reducing deformation section（106）Cone deformed area top end diameter D6（mm） | 15 | 12 | 4 | 16 | 15 |
| Wire drawing preformation cone reducing deformation section（106）Cone deformed area transition length L6（mm） | 50 | 40 | 60 | 90 | 60 |
| Symmetrical diplopore opening surface（108）Diameter D8（mm） | 4 | 3 | 1 | 7 | 5 |
| Tail pipe extends enlarging wire drawing gripping section（105）Enlarging tail end diameter D5（mm） | 53 | 59 | 32 | 65 | 62 |
| Frosted radiating segment（107）Length L7（mm） | 220 | 240 | 30 | 260 | 170 |
| Frosted radiating segment（107）Central point extends enlarging wire drawing gripping section with tail pipe（105）Enlarging caudal end apart from L57（mm） | 310 | 380 | 200 | 500 | 400 |
| Fine section is punched into wire drawing（101）Long rod outside diameter D1（mm） | 50 | 55 | 30 | 60 | 58 |
| Wire drawing is punched into fine section（101）Fibre core（102）Diameter D2（mm） | 3.3 | 3.6 | 1 | 5 | 4.1 |
| Fine section is punched into wire drawing（101）Long rod length L1（mm） | 436 | 493 | 200 | 600 | 537 |
| Symmetrical diplopore（103）Diameter D3（mm） | 16 | 18 | 10 | 20 | 19 |
| Wire drawing is punched into fine section（101）Outer circumferential edge and symmetrical diplopore（103）Hole outer circumferential edge back gauge T31（mm） | 5 | 3 | 2 | 5 | 4 |
| Prepare the non-circularity of cladding of optical fiber（%） | 1.1 | 0.8 | 0.9 | 0.7 | 0.8 |
| Prepare the single rod wire drawing effective fiber length of optical fiber（km） | 96 | 112 | 49 | 143 | 131 |
| Prepare the proof strength of optical fiber（Kpsi） | 120 | 115 | 110 | 130 | 120 |
| Prepare the polarization crosstalk of optical fiber（@1550nm, dB, 1km） | -30.4 | -30.3 | -31.1 | -31.9 | -31.6 |
Table 1 is embodiment 2~6, and five different head ends carry out preformation cone reducing, and tail end carries out the present invention of the structure design of enlarging
The parameter in panda type polarization-preserving fiber wire-drawing shape preform arrangement, the geometry of prefabricated rods and each region is of different sizes, and 5 pre-
Rod processed, panda type polarization-preserving fiber is made using same drawing process wire drawing.As a result at the 1550nm wavelength for showing 5 optical fiber
The performance parameters of the polarization crosstalk of 1km length have all been reached below -30dB, the single rod length of strings of different preform diameters with
Change, for the prefabricated rods of major diameter, the effective delivery efficiency of length of string is higher, up to more than 120km.The present invention's is prefabricated
Rod, in the case where not taking morphology shaping, realizes the optimization design of fiber cladding noncircularity, has reached 1.1%
Below；It also assures that the proof strength of drawing optical fiber in more than 100Kpsi simultaneously.
In addition：It should be noted that above-mentioned embodiment is only a prioritization scheme of this patent, the skill of this area
Any change or improvement that art personnel are done according to above-mentioned design, within the protection domain of this patent.
Claims (9)
1. a kind of polarization-preserving fiber preform, it is characterised in that：It includes punching wire drawing into fine section（101）, extension tailpipe section
（104）, tail pipe extend enlarging wire drawing gripping section（105）, wire drawing preformation cone reducing deformation section（106）；
Wire drawing is wherein punched into fine section（101）Include fibre core（102）And clad section（109）, the clad section（109）Cladding
In fibre core（102）Periphery, and clad section（109）In be additionally provided with symmetrical diplopore（103）, the symmetrical diplopore（103）Relatively
In fibre core（102）It is arranged symmetrically；
The extension tailpipe section（104）Located at punching wire drawing into fine section（101）Rear portion, extends tailpipe section（104）With punching wire drawing
Into fine section（101）It is parallel, wire drawing gripping section（105）It is extension tailpipe section（104）Tail end a part, wire drawing gripping section（105）
In horn-like, its outside bore is more than inner side bore, the deformation section of the wire drawing preformation cone reducing（106）It is to punch wire drawing into fibre
Section（101）Head end a part, deformation section（106）In horn-like, its outside bore is less than inner side bore, deformation section（106）'s
Top conehead is designed using opening, and its surface is diplopore opening surface（108）, extend tailpipe section in addition（104）Close to tail end
Place is additionally provided with frosted radiating segment（107）.
2. a kind of polarization-preserving fiber preform according to claim 1, it is characterised in that：The deformation section（106）Cone become
Shape area top end diameter D6 ∈（1mm, 12mm）, deformation section（106）Cone deformed area transition length L6 ∈（40mm, 80mm）, deformation
Section（106）Top conehead designed using opening, it is desirable to symmetrical diplopore opening surface（108）Diameter D8 ∈（1mm, 5mm）.
3. a kind of polarization-preserving fiber preform according to claim 1, it is characterised in that：The wire drawing gripping section（105）Expand
Mouth tail end diameter D5 ∈（32mm, 65mm）.
4. a kind of polarization-preserving fiber preform according to claim 1, it is characterised in that：The frosted radiating segment（107）'s
Length L7 ∈（10mm, 200mm）, frosted radiating segment（107）Central point extends enlarging wire drawing gripping section with tail pipe（105）Enlarging
Caudal end apart from L57 ∈（200mm, 500mm）.
5. a kind of polarization-preserving fiber preform according to claim 1, it is characterised in that：The extension tailpipe section（104）'s
Bore D4 ∈（22mm, 58mm）, length L4 ∈（300mm, 800mm）, extend tailpipe section（104）Pipe external diameter and prefabricated rods draw
Silk punches into fine section（101）Long rod outside diameter D1 size it is consistent, D1 ∈（30mm, 60mm）.
6. a kind of polarization-preserving fiber preform according to claim 1, it is characterised in that：The fibre core（102）Diameter D2
∈（1mm, 5mm）, length L1 ∈（200mm, 600mm）, symmetrical diplopore（103）Diameter D3 ∈（10mm, 20mm）, symmetrical diplopore
（103）Diplopore inset spacing T2 ∈（1.5mm, 10mm）, wire drawing is into fine section（101）Outer circumferential edge and symmetrical diplopore（103）Hole
The back gauge T3 ∈ of outer circumferential edge（2mm, 5mm）.
7. a kind of polarization-preserving fiber preform according to claim 1, it is characterised in that：The extension tailpipe section（104）Make
With flame or electric furnace or plasma heating with punching wire drawing into fine section（101）Docked, collapsing together, forms integration
Moulding prefabricated rod structure.
8. a kind of polarization-preserving fiber preform according to claim 1, it is characterised in that：Wire drawing gripping section（105）Pass through heat
Source carries out tail end heating, then by the way of mechanical enlarging, realizes tail end enlarging, and clamping prefabricated rods carry out the function of wire drawing.
9. a kind of polarization-preserving fiber preform according to claim 1, it is characterised in that：Deformation section（106）Entered by thermal source
Wardrobe end is heated, and is carried out the deformation structure that preformation bores reducer using the method for melting extension, is realized diplopore wire drawing variable diameter design.
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| CN107311445B (en) | 2023-01-17 |
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