CN112299704B - Clamp and clamping method for improving geometric accuracy of polarization maintaining optical fiber preform - Google Patents
Clamp and clamping method for improving geometric accuracy of polarization maintaining optical fiber preform Download PDFInfo
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- CN112299704B CN112299704B CN202011271799.XA CN202011271799A CN112299704B CN 112299704 B CN112299704 B CN 112299704B CN 202011271799 A CN202011271799 A CN 202011271799A CN 112299704 B CN112299704 B CN 112299704B
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- inner sleeve
- outer sleeve
- sleeve
- spring pad
- hole
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- 230000010287 polarization Effects 0.000 title claims abstract description 30
- 239000013307 optical fiber Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000010453 quartz Substances 0.000 claims abstract description 27
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 10
- 239000010935 stainless steel Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000011521 glass Substances 0.000 claims abstract description 5
- 238000005137 deposition process Methods 0.000 abstract 2
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 238000013467 fragmentation Methods 0.000 abstract 1
- 238000006062 fragmentation reaction Methods 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 description 17
- 239000000835 fiber Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 230000001427 coherent effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052810 boron oxide Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000004017 vitrification Methods 0.000 description 1
Classifications
-
- 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
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/018—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Abstract
The invention relates to a clamp and a clamping method for improving geometric accuracy of a polarization maintaining optical fiber preform. The clamp comprises an outer sleeve, an inner sleeve and a spring pad, wherein the spring pad is made of stainless steel ultrathin materials, the quartz tube is fixed in a line contact mode, hoop pressure is applied to the inner sleeve and the spring pad through the outer sleeve, flatness and roundness of the quartz base tube are guaranteed, the outer sleeve and the inner sleeve are made of stainless steel materials to finish rigid connection of the quartz tube and a glass lathe, clamping stability of the quartz tube is effectively improved, mechanical precision requirements on a glass lathe chuck system in a preform rod deposition process are reduced, risk of fragmentation of the quartz tube in a reaction process is reduced, safety of an integral deposition process is improved, and finally geometric precision of the polarization maintaining optical fiber preform rod can be improved.
Description
Technical Field
The invention relates to a clamp for manufacturing a polarization maintaining optical fiber preform, in particular to a clamp for improving geometric accuracy of the polarization maintaining optical fiber preform and a clamping method.
Background
Polarization maintaining optical fibers are widely applied to various fields of national economy such as aerospace, aviation, navigation, industrial manufacturing technology and communication. In an interference type optical fiber sensor based on optical coherent detection, a polarization maintaining optical fiber is used to ensure that the linear polarization direction is unchanged and improve the coherent signal to noise ratio so as to realize high-precision measurement of physical quantity. The polarization maintaining fiber is used as a special fiber and is mainly applied to a fiber-optic gyroscope system.
The key performance index of the polarization maintaining optical fiber is that the polarization maintaining optical fiber ensures that linearly polarized light keeps a polarization state in the transmission process, and the performance index is mainly embodied in the polarization crosstalk index and the beat length index of the polarization maintaining optical fiber. The lower the value of polarization crosstalk (which is a negative value), the better the polarization maintaining performance of the polarization maintaining fiber. The unit of beat length is millimeter, and a smaller value indicates that the polarization maintaining performance of the polarization maintaining fiber is more excellent.
The mainstream polarization maintaining fiber at present mainly adopts a circular symmetrical structure, namely boron doped stress bars are symmetrically arranged at two sides of the core part of the single-mode preform rod, so that the effect of stress application is achieved. Therefore, the boron-doped stress preform plays a decisive role in improving the polarization maintaining performance of the polarization maintaining fiber. While the main performance indexes of the boron-doped stress preform include the size (core diameter) and doping concentration (relative refractive index difference) of the boron-doped region. In principle, the boron doped stress rod is mainly used for realizing polarization performance maintenance according to the fact that a huge thermal expansion coefficient difference exists between boron oxide and silicon dioxide. The difference in thermal expansion coefficients between the two presents great difficulties in the fabrication process of the stress preform. As this would result in the boron doped stress rod being very susceptible to insufficient vitrification and cracking during fabrication. The flatness and roundness of the quartz substrate tube from which the preform is made directly determine the likelihood of failure to vitrify and burst during deposition of the boron-doped stress preform. Therefore, the manufacturing process of the boron-doped stress preform is highly dependent on the flatness and roundness of the quartz substrate tube.
Disclosure of Invention
In view of the defects existing in the prior art, the invention provides a clamp and a clamping method for improving the geometric precision of a polarization maintaining optical fiber preform, and the technical scheme is that the clamp for improving the geometric precision of the polarization maintaining optical fiber preform comprises an outer sleeve, an inner sleeve and a spring pad, and is characterized in that: the outer sleeve is made of stainless steel, the central part is a cylinder with a hollow structure, the height is the same as the length of the spring pad, the hollow part of the outer sleeve is sequentially provided with an outer sleeve internal threaded hole, a middle round hole, a conical hole and a round hole which are concentric with the axle center from top to bottom, the conical degree and the size of the conical hole of the threaded hole are the same as those of the conical body of the lower end of the spring pad, the inner sleeve is made of stainless steel, the central part is a stepped cylinder with a hollow structure, the outer thread of the inner sleeve is arranged on the round side surface of the stepped cylinder and is matched with the outer sleeve internal threaded hole, and the hollow part is sequentially provided with an inner sleeve conical hole and an inner sleeve round hole which are concentric with the axle center from top to bottom; the taper and the size of the conical hole of the inner sleeve are the same as those of the conical body of the upper end of the spring cushion, the spring cushion is made of stainless steel ultrathin materials, the upper end of the spring cushion, the cylindrical shell and the lower end of the spring cushion are connected into an integral ultrathin shell, the upper end and the lower end of the spring cushion are provided with holes, the diameters of the holes are the same as the outer diameter of a quartz tube, the middle part of the cylindrical shell is provided with uniformly distributed axial cracks, the external thread of the inner sleeve is screwed on the internal threaded hole of the outer sleeve, and the spring cushion is arranged in a cavity formed by the inner sleeve and the outer sleeve.
The clamping method comprises the steps of (I) tightly fixing the outer sleeve of the clamping device with the rotary chucks at the head end and the tail end of the glass lathe, and locking; secondly, selecting a quartz base tube, tightly locking the quartz base tube on openings at the upper end and the lower end of a spring pad, and adopting a line contact mode to have certain elasticity; thirdly, placing the spring pad holding the quartz base tube in the conical hole of the inner sleeve, and placing the inner sleeve in the hollow part of the outer sleeve to enable the quartz base tube to slowly pass through the round hole of the outer sleeve; fourthly, butting the external thread of the inner sleeve with the internal thread hole of the outer sleeve, and then slowly screwing the inner sleeve into the outer sleeve by using a special locking spanner, wherein the inner sleeve of the clamping device is ensured to enter the central hole of the outer sleeve, and annular pressure is applied to the spring pad by the outer sleeve in the screwing process, so that the flatness and roundness of the quartz base tube are ensured; fifthly, checking that all parts to be fixed are in a completely locked state, and completing the clamping process.
The invention has the advantage that the precise fixation between the brittle material (quartz base tube) and the rigid material (rotary chuck) can be realized flexibly. The flatness and the roundness of the quartz base tube are ensured, and the geometric accuracy of the polarization maintaining optical fiber preform is improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a cross-sectional view of the jacket of the present invention;
FIG. 3 is a cross-sectional view of the inner sleeve of the present invention;
fig. 4 is a schematic view of the spring pad structure of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and examples.
As shown in fig. 1, 2, 3 and 4, the fixture for improving the geometric precision of the polarization maintaining optical fiber preform comprises an outer sleeve 1, an inner sleeve 2 and a spring pad 3, wherein the outer sleeve 1 is made of stainless steel, the central part of the outer sleeve is a cylinder with a hollow structure, the height of the outer sleeve is the same as that of the spring pad 3, and an outer sleeve internal threaded hole 1-1, a middle round hole 1-2, a conical hole 1-3 and a round hole 1-4 which are concentric with the axle center are sequentially arranged in the hollow part of the outer sleeve 1 from top to bottom; the taper of the taper hole 1-3 is the same as the taper and the dimension of the lower taper 3-1 of the spring pad 3, the inner sleeve 2 is made of stainless steel materials, the center part is a step cylinder with a hollow structure, the outer thread 2-1 of the inner sleeve is matched with the inner thread hole 1-1 of the outer sleeve 1 on the big round side surface of the step cylinder, and the hollow part is sequentially provided with the taper hole 2-3 of the inner sleeve and the round hole 2-2 of the inner sleeve which are concentric with the axle center from top to bottom; the taper and the size of the inner sleeve taper hole 2-3 are the same as those of the upper end taper 3-2 of the spring pad 3, the spring pad 3 is made of stainless steel ultrathin materials, the upper end taper 3-2, the cylindrical shell 3-3 and the lower end taper 3-1 are connected into an integral ultrathin shell, openings are formed in the upper end and the lower end, the diameter of the opening is the same as that of the quartz tube, an axial slit 3-4 which is uniformly distributed is formed in the middle of the cylindrical shell 3-3, the external thread 2-1 of the inner sleeve 2 is screwed on the internal thread hole 1-1 of the outer sleeve 1, and the spring pad 3 is arranged in a cavity formed by the inner sleeve 2 and the outer sleeve 1.
The clamping method is that,
tightly fixing the outer sleeve 1 of the clamping device with the rotary chucks at the head end and the tail end of the glass lathe, and locking;
secondly, selecting a quartz base tube, tightly locking the quartz base tube on openings at the upper end and the lower end of the spring pad 3, and adopting a line contact mode to have certain elasticity;
thirdly, placing a spring pad 3 clamping the quartz base tube into the inner sleeve conical hole 2-3 of the inner sleeve 2, and placing the inner sleeve 2 into the hollow part of the outer sleeve 1 to enable the quartz base tube to slowly pass through the round hole 1-4 of the outer sleeve 1;
fourthly, butting the external thread 2-1 of the inner sleeve 2 with the internal thread hole 1-1 of the outer sleeve 1, and then slowly screwing the inner sleeve 2 into the outer sleeve 1 by using a special locking spanner, wherein the inner sleeve 2 of the clamping device is ensured to enter the central hole of the outer sleeve 1, and the flatness and roundness of the quartz base tube are ensured by applying circumferential pressure to the spring pad 3 of the outer sleeve 1 in the screwing process;
fifthly, checking that all parts to be fixed are in a completely locked state, and completing the clamping process.
Other types of optical fiber preforms can be manufactured according to example 1.
The invention is not limited to the optical fiber preform manufacturing process, and can be modified and expanded in a plurality of ways without departing from the principle of the invention under the condition of similar application scenes, and the modification and the expansion are considered as being within the protection scope of the invention. What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (1)
1. A clamping method for improving geometric accuracy of a polarization maintaining optical fiber preform is characterized by comprising the following steps: the clamping device is used for clamping the polarization maintaining optical fiber preform rod, the clamping device comprises an outer sleeve (1), an inner sleeve (2) and a spring pad (3), wherein the outer sleeve (1) is made of stainless steel, the central part of the outer sleeve is a cylinder with a hollow structure, the height of the outer sleeve is identical to the length of the spring pad (3), an outer sleeve internal threaded hole (1-1), a middle round hole (1-2), a conical hole (1-3) and a round hole (1-4) which are concentric with the axle center are sequentially formed in the hollow part of the outer sleeve (1) from top to bottom, the inner sleeve internal threaded hole (1-1), the conical hole (1-3) and the inner sleeve conical hole (2-2) are sequentially formed in the hollow part of the outer sleeve (2-1) from top to bottom, the conical hole (2-3) and the round hole (2-2) of the inner sleeve are sequentially concentric with the axle center, the inner sleeve (2-3) and the conical hole (3) are formed in the hollow part of the inner sleeve (2) is made of a stepped cylinder; the taper of the conical hole (2-3) of the inner sleeve has the same taper and size as those of the conical body (3-2) at the upper end of the spring pad (3), the spring pad (3) is made of stainless steel ultrathin materials, the upper end of the conical body (3-2), the cylindrical shell (3-3) and the lower end of the conical body (3-1) are connected into an integral ultrathin shell, openings are formed in the upper end and the lower end of the ultrathin shell, the diameter of the openings is the same as the outer diameter of a quartz tube, axial cracks (3-4) are uniformly distributed in the middle of the cylindrical shell (3-3), the outer thread (2-1) of the inner sleeve (2) of the inner sleeve is screwed on the inner threaded hole (1-1) of the outer sleeve (1), and the spring pad (3) is arranged in a cavity formed by the inner sleeve (2) and the outer sleeve (1);
the clamping method comprises the steps of (I) tightly fixing an outer sleeve (1) of a clamping device with rotary chucks at the head end and the tail end of a glass lathe, and locking;
secondly, selecting a quartz base tube, tightly locking the quartz base tube on openings at the upper end and the lower end of a spring pad (3), and adopting a line contact mode to have certain elasticity;
thirdly, placing a spring pad (3) clamping the quartz base tube into the inner sleeve conical hole (2-3) of the inner sleeve (2), and placing the inner sleeve (2) into the hollow part of the outer sleeve (1) to enable the quartz base tube to slowly pass through the round hole (1-4) of the outer sleeve (1);
fourthly, butting an inner sleeve external thread (2-1) of the inner sleeve (2) with an outer sleeve internal thread hole (1-1) of the outer sleeve (1), and then slowly screwing the inner sleeve (2) into the outer sleeve (1) by using a special locking spanner, wherein the inner sleeve (2) of the clamping device is ensured to enter a central hole of the outer sleeve (1), and circumferential pressure is applied to the spring pad (3) by the outer sleeve (1) in the screwing process, so that the flatness and the roundness of the quartz base tube are ensured;
fifthly, checking that all parts to be fixed are in a completely locked state, and completing the clamping process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011271799.XA CN112299704B (en) | 2020-11-13 | 2020-11-13 | Clamp and clamping method for improving geometric accuracy of polarization maintaining optical fiber preform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011271799.XA CN112299704B (en) | 2020-11-13 | 2020-11-13 | Clamp and clamping method for improving geometric accuracy of polarization maintaining optical fiber preform |
Publications (2)
| Publication Number | Publication Date |
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| CN112299704A CN112299704A (en) | 2021-02-02 |
| CN112299704B true CN112299704B (en) | 2023-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011271799.XA Active CN112299704B (en) | 2020-11-13 | 2020-11-13 | Clamp and clamping method for improving geometric accuracy of polarization maintaining optical fiber preform |
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| Country | Link |
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| CN (1) | CN112299704B (en) |
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| CN107540204A (en) * | 2017-10-18 | 2018-01-05 | 南京纬力创新能源科技有限公司 | A kind of preform production equipment with temperature adjusting and exhaust-gas treatment function |
| CN207352214U (en) * | 2017-07-23 | 2018-05-11 | 石河子大学 | A kind of optical fiber clamping device |
| CN110823693A (en) * | 2019-11-13 | 2020-02-21 | 深圳市安达工业设计有限公司 | Prevent optical fiber perform tensile testing arrangement who emptys |
| CN210953337U (en) * | 2019-12-09 | 2020-07-07 | 中国工程物理研究院激光聚变研究中心 | Clamp for measuring refractive index distribution of optical fiber |
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2020
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| JP2002137932A (en) * | 2000-10-26 | 2002-05-14 | Sumitomo Electric Ind Ltd | Method of joining furnace core tube, method of producing base material of optical fiber and joining material |
| CN1317705A (en) * | 2001-05-18 | 2001-10-17 | 哈尔滨工程大学 | Plastic optical fibre connector and formation of optical fibre and in shape of reverse-taper lens |
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| CN112299704A (en) | 2021-02-02 |
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