CN105016615A - Manufacturing method of twisted bow-tie optical fiber perform with small stress zone - Google Patents
Manufacturing method of twisted bow-tie optical fiber perform with small stress zone Download PDFInfo
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- CN105016615A CN105016615A CN201410166207.6A CN201410166207A CN105016615A CN 105016615 A CN105016615 A CN 105016615A CN 201410166207 A CN201410166207 A CN 201410166207A CN 105016615 A CN105016615 A CN 105016615A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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Abstract
The invention discloses a manufacturing method of a twisted bow-tie optical fiber perform with a small stress zone. The manufacturing method is characterized in that the optical fiber perform is manufactured by a modified chemical vapor deposition method (MCVD) and has a smaller area of stress zone than a traditional bow-tie optical fiber perform and therefore the problem that an optical fiber perform is prone to blasting in a subsequent processing treatment process can be solved; in addition, since the inner skin layer of the optical fiber perform is relatively large in diameter, the problem that the ovality of a core layer is large is solved and the fiber loss is further lowered; and since a sleeve layer is added at the outer part of the optical fiber perform, the problems of quartz volatilization and stockpiling can be solved when the optical fiber perform is twisted. The manufacturing method is low in operation difficulty; and the manufactured optical fiber perform is applicable to being twisted at a high temperature or polished at normal temperature, which is crucial for manufacturing of circular-birefringence optical fibers.
Description
Technical field
The present invention relates to a kind of manufacture method of the little stressed zone bow-tie fiber prefabricated rods for reversing, is the committed step manufacturing circular birefringent fiber.
Background technology
In recent years, all-fiber current transformator is large with its dynamicrange, bandwidth, flexible for installation, anti-electromagnetic interference capability strong, can the advantage such as test cross direct current signal, become the development trend of novel current transformer.Because the all-fiber current transformator taking Faraday effect as ultimate principle is responsive equally to the linear birefrigence in Fibre Optical Sensor ring, this makes low linear birefringent fiber become the core parts of all-fiber current transformator.
The low linear birefringent fiber of original adoption is reversed by general single mode fiber and obtains, concrete manufacture method also respectively publication number be the Chinese patent " during drawing the optical fiber producing apparatus of spin fiber pre-shaped and method " of CN 1663922, Authorization Notice No. is the Chinese patent " optical fiber twisting device " of CN 201857345, Chinese patent that publication number is CN 1472153 " manufacture method of low polarisation mode dispersion single-mode fiber and the optical fiber prepared by the method " proposes, concrete grammar is all in drawing process, rotate prefabricated rods or rubbing optical fiber realizes reversing.That studies all-fiber current transformator along with people gos deep into, find that traditional low linear birefringent fiber exists the shortcomings such as such as bending resistance is poor, impact resistance is poor, temperature stability is weak gradually, and another kind enters the people visual field with the low linear birefringent fiber of stressed zone also known as circular birefringent fiber, this optical fiber introduces a large amount of circular birefringence to suppress residuary linear birefringence, makes fiber optic loop have very strong anti-external interference ability.The essential structure of circular birefringent fiber is given: distribute along fiber axis curl with one or more stressed zone in covering in No. 92113821.0 Chinese patent " keeping the optical fiber of circular polarization state and its preparation method ".Making circular birefringence rotates the method for prefabricated rods or rubbing optical fiber in drawing process before can applying mechanically, but there are some difficult problems in these methods: 1, due to circular birefringent fiber below pitch general requirement 8mm, and in order to keep physical strength drawing speed must maintain more than 30m/min, now prefabricated rods rotating speed or rubbing speed need reach more than 3500r/min, and this has far exceeded the normal operating limit of machine; 2, in drawing process, rotation can make optical fiber swing, and occurs to apply the phenomenons such as irregular.
The Chinese patent " manufacture method of ultra-low birefringence fiber and circumgyration stretch tower " of application publication number CN 102442774 proposes the method for prefabricated rods circumgyration stretch, this method can well be applied in the torsion of general single mode fiber prefabricated rods, but there are following difficult problems in the torsion for bow-tie type prefabricated rods: 1, traditional bow-tie type prefabricated rods stressed zone area accounts for total sectional area more than 10%, and prefabricated rods easily bursts in following process process; 2, traditional bow-tie fiber fibre core ovality is up to more than 28%, if make spin fiber, can cause core diameter maldistribution, and then affects multiple index such as fiber cut off wavelength, mode field diameter, also there is the problem with other coupling fiber difficulties simultaneously; 3, reversing is at high temperature carry out, and volatilization and windrow phenomenon will inevitably occur quartz, the exodermis even stressed zone of this meeting havoc prefabricated rods.
Summary of the invention
The invention provides a kind of manufacture method of the little stressed zone bow-tie fiber prefabricated rods for reversing, comprise prefabricated rods to make and prefabricated rods sleeve pipe step, when particularly will solve the higher problem of the problem that traditional bow-tie type prefabricated rods easily bursts in following process process, traditional bow-tie type preform core ovality and reverse, quartz volatilizees and the problem of windrow.
The technical solution adopted in the present invention is:
1, prefabricated rods makes and adopts modified chemical vapor deposition process (MCVD) (MCVD), compared with traditional bow-tie type prefabricated rods, when depositing stressor layers, decreasing the inlet amount of every layer and reducing certain number of plies; During deposition endodermis, add the inlet amount of every layer and increase certain number of plies.
2, after prefabricated rods is made, place concentric vertically to prefabricated rods and silica tube, MCVD lathe adds hot melt contracting vertically, makes the prefabricated rods with casing layer.
Compared with prior art, the invention has the beneficial effects as follows:
1, the prefabricated rods sleeve pipe front stressed zone area adopting the present invention to make accounts for 3 ~ 7% of the cross section total area, and prefabricated rods is not easily burst in following process process.
2, while stressed zone area reduces, endodermis diameter is increased, the benefit done like this has: (1) can effectively reduce stressed zone in molten compression process and, on the impact of sandwich layer ovality, adopt the present invention that fibre core ovality can be made to be down to less than 3%, reach the standard of general single mode fiber; (2) reduce the Intrinsic Gettering of stressed zone dopant material, fibre loss is reduced.
3, the benefit adding casing layer in prefabricated rods outside has: (1) solves the volatilization of prefabricated rods in high temperature twist process and windrow problem, allows volatilization and windrow all occur in casing layer, ensure that the structural integrity of original prefabricated rods; (2) further reduce the per-cent that stressed zone area accounts for the cross section total area, the problem that bursts solves completely.
4, the beneficial effect of prefabricated rods to final circular birefringent fiber adopting the present invention to obtain has: (1) can improve the mechanical property of optical fiber; (2) can make optical fiber easily and other coupling fibers; (3) manufacture difficulty of optical fiber can be reduced, improve yield rate.
Accompanying drawing explanation
Fig. 1 is the little stressed zone bow-tie fiber prefabricated rods schematic cross-section with casing layer.
Fig. 2 is the little stressed zone bow-tie fiber prefabricated rods Making programme figure with casing layer.
Figure center core layer-1, endodermis-2, stressed zone-3, exodermis-4, casing layer-5.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
With bow-tie fiber prefabricated rods cross section, casing layer little stressed zone as shown in Figure 1, its structure is sandwich layer, endodermis, stressed zone, exodermis, casing layer from inside to outside successively.
Making with the little stressed zone bow-tie fiber prefabricated rods of casing layer carries out on MCVD lathe, and its concrete steps as shown in Figure 2, comprising:
1, on MCVD lathe, bushing pipe is connected with skirt and tail pipe respectively, and inside and outside polished finish is carried out to bushing pipe.
2, normal sedimentation exodermis.
3, deposit stressor layers, the inlet amount of stressor layers every layer few compared with traditional bow-tie fiber prefabricated rods, and the deposition number of plies reduces.
4, etch stressor layers, stopped operating by bushing pipe, immediately below bushing pipe, move counter stress layer vertically with etching lamp etch, proof stress layer disconnects; Then bushing pipe is rotated 180 ° of etching the other ends, ensure that the other end stressor layers disconnects.
5, deposit endodermis, the inlet amount of endodermis every layer is many compared with traditional bow-tie fiber prefabricated rods, and the deposition number of plies increases.
6, normal sedimentation sandwich layer.
7, shrinking and outer throwing process is carried out, the little stressed zone bow-tie fiber prefabricated rods before obtained sleeve pipe.
8, after silica tube deionized water rinsing, pickling, fire are thrown, by its one end reducing.
9, be placed in silica tube by prefabricated rods, one end and silica tube necking end are fixed, and the other end workpiece and silica tube are fixed, and the concentricity of retention bar pipe.
10, two termination skirts are reapposed on MCVD lathe, from one end mobile heating vertically of reducing, make the little stressed zone bow-tie fiber prefabricated rods with casing layer.
Embodiment 1:
1, make in excellent step, stressor layers every layer inlet amount reduces 20%, and the deposition number of plies is 3 layers, endodermis every layer inlet amount increases by 50%, and the deposition number of plies is 3 layers, and making optical fiber prefabricating rod outside diameter is 11.0mm, be drawn into the optical fiber that diameter is 79.8 μm, stressed zone area is 241.3 μm
2, account for 4.8% of the total area, this accounting can ensure that prefabricated rods is at high temperature reversed or under normal temperature, grinding and polishing all can not burst; The inner fibre core ovality 1.4% of optical fiber, outer end fibre core ovality 1.3%, reaches the requirement before torsion; It is 6.67mm that optical fiber is clapped long at 1310nm wave band, can meet and reverse the front requirement to polarization property.
2, in sleeve pipe step, quartz pushrod external diameter 19mm, wall thickness 2mm, be 2140 ± 5 DEG C in temperature, under the speed of a motor vehicle is the condition of 8mm/min, make the prefabricated rods external diameter 15.9mm with casing layer, inner bright and clean bubble-free, the core concentricity difference of drawing optic fibre is 0.9 μm, after sleeve pipe, concentricity is better, and casing layer accounts for total cross-sectional area and reaches 51.5%, may be used for reversing.
Claims (8)
1. the manufacture method of little stressed zone bow-tie fiber prefabricated rods for reversing, it is characterized in that the making step of preform adopts modified chemical vapor deposition process (MCVD) (MCVD), compared with traditional bow-tie fiber prefabricated rods, its stressed zone area is less, endodermis diameter is comparatively large, and adds casing layer in prefabricated rods outside.
2. the manufacture method of a kind of little stressed zone bow-tie fiber prefabricated rods for reversing according to claim 1, is characterized in that the external diameter before preform sleeve pipe is 11 ~ 20mm.
3. the manufacture method of a kind of little stressed zone bow-tie fiber prefabricated rods for reversing according to claim 1 and 2, be directly drawn into Φ 80 optical fiber before it is characterized in that preform sleeve pipe, fiber cross-sections stressed zone area accounts for 3 ~ 7% of the cross section total area.
4. the manufacture method of a kind of little stressed zone bow-tie fiber prefabricated rods for reversing according to claim 1 and 2, be directly drawn into Φ 80 optical fiber before it is characterized in that preform sleeve pipe, optical fiber endodermis diameter is 18 ~ 22 μm
.
5. the manufacture method of a kind of little stressed zone bow-tie fiber prefabricated rods for reversing according to claim 1 and 2, is directly drawn into Φ 80 optical fiber before it is characterized in that preform sleeve pipe, and optical fiber is 4 ~ 10mm in the bat length of 1310nm wave band
.
6. the manufacture method of a kind of little stressed zone bow-tie fiber prefabricated rods for reversing according to claim 1, it is characterized in that for the silica tube external diameter of sleeve pipe be 19 ~ 30mm, wall thickness is 1 ~ 3mm
.
7. the manufacture method of a kind of little stressed zone bow-tie fiber prefabricated rods for reversing according to claim 1 or 6, prefabricated rods and silica tube is it is characterized in that to place with one heart and at high temperature molten contracting along axis, Heating temperature is 2140 ± 50 DEG C, and the speed of a motor vehicle is 5 ~ 10mm/min
.
8. the manufacture method of a kind of little stressed zone bow-tie fiber prefabricated rods for reversing according to claim 1 or 6, is characterized in that with the prefabricated rods external diameter of casing layer be 15 ~ 25mm
.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410166207.6A CN105016615B (en) | 2014-04-24 | 2014-04-24 | A kind of manufacturing method of the small stressed zone bow-tie fiber prefabricated rods for torsion |
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| CN201410166207.6A CN105016615B (en) | 2014-04-24 | 2014-04-24 | A kind of manufacturing method of the small stressed zone bow-tie fiber prefabricated rods for torsion |
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| CN105016615A true CN105016615A (en) | 2015-11-04 |
| CN105016615B CN105016615B (en) | 2018-11-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866880A (en) * | 2016-06-14 | 2016-08-17 | 烽火通信科技股份有限公司 | Preparation method of polarization-maintaining optical fibers |
| CN106199827A (en) * | 2016-07-27 | 2016-12-07 | 武汉长盈通光电技术有限公司 | A kind of oval core panda type polarization-preserving fiber and preparation method thereof |
| CN110954987A (en) * | 2019-12-05 | 2020-04-03 | 上海传输线研究所（中国电子科技集团公司第二十三研究所） | Elliptical core-bow-tie type single-polarization structure optical fiber and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001342032A (en) * | 2000-05-29 | 2001-12-11 | Fujikura Ltd | Method of manufacturing optical fiber preform by dipping process and injection plug |
| EP1395523B1 (en) * | 2001-05-30 | 2004-12-15 | 3M Innovative Properties Company | Optical waveguide article including a fluorine-containing zone |
| CN102295407A (en) * | 2010-06-25 | 2011-12-28 | 北京玻璃研究院 | Manufacturing method of polarization maintaining optical fiber |
-
2014
- 2014-04-24 CN CN201410166207.6A patent/CN105016615B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001342032A (en) * | 2000-05-29 | 2001-12-11 | Fujikura Ltd | Method of manufacturing optical fiber preform by dipping process and injection plug |
| EP1395523B1 (en) * | 2001-05-30 | 2004-12-15 | 3M Innovative Properties Company | Optical waveguide article including a fluorine-containing zone |
| CN102295407A (en) * | 2010-06-25 | 2011-12-28 | 北京玻璃研究院 | Manufacturing method of polarization maintaining optical fiber |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866880A (en) * | 2016-06-14 | 2016-08-17 | 烽火通信科技股份有限公司 | Preparation method of polarization-maintaining optical fibers |
| CN105866880B (en) * | 2016-06-14 | 2018-12-28 | 烽火通信科技股份有限公司 | A kind of preparation method of polarization maintaining optical fibre |
| CN106199827A (en) * | 2016-07-27 | 2016-12-07 | 武汉长盈通光电技术有限公司 | A kind of oval core panda type polarization-preserving fiber and preparation method thereof |
| CN110954987A (en) * | 2019-12-05 | 2020-04-03 | 上海传输线研究所（中国电子科技集团公司第二十三研究所） | Elliptical core-bow-tie type single-polarization structure optical fiber and manufacturing method thereof |
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| CN105016615B (en) | 2018-11-30 |
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Address after: 101111 No.7 juer Hutong, Dongcheng District, Beijing Patentee after: Beijing Yiqing Research Institute Co.,Ltd. Address before: 101111 No.7 juer Hutong, Dongcheng District, Beijing Patentee before: BEIJING INDUSTRIAL TECHNOLOGY Research Institute |
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Effective date of registration: 20230217 Address after: 101111 No.5 Xingguang 4th Street, optical Mechatronics industrial base, Zhongguancun Science Park, Tongzhou District, Beijing Patentee after: Beijing Glass Research Institute Co.,Ltd. Patentee after: Beijing Yiqing Research Institute Co.,Ltd. Address before: 101111 No.7 juer Hutong, Dongcheng District, Beijing Patentee before: Beijing Yiqing Research Institute Co.,Ltd. |
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