WO2012043675A1 - Procédé de préparation d'une préforme, procédé de production d'une fibre optique, et fibre optique - Google Patents

Procédé de préparation d'une préforme, procédé de production d'une fibre optique, et fibre optique Download PDF

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Publication number
WO2012043675A1
WO2012043675A1 PCT/JP2011/072278 JP2011072278W WO2012043675A1 WO 2012043675 A1 WO2012043675 A1 WO 2012043675A1 JP 2011072278 W JP2011072278 W JP 2011072278W WO 2012043675 A1 WO2012043675 A1 WO 2012043675A1
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WO
WIPO (PCT)
Prior art keywords
core
jacket tube
preform
clad
optical fiber
Prior art date
Application number
PCT/JP2011/072278
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English (en)
Japanese (ja)
Inventor
健一郎 高橋
修 島川
雄一 水戸瀬
拓志 永島
蟹江　智彦
Original Assignee
住友電気工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友電気工業株式会社 filed Critical 住友電気工業株式会社
Priority to KR1020137010547A priority Critical patent/KR20140009156A/ko
Priority to CN201180047403.6A priority patent/CN103153889B/zh
Publication of WO2012043675A1 publication Critical patent/WO2012043675A1/fr

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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
    • 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
    • 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
    • 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
    • C03B2203/12—Non-circular or non-elliptical cross-section, e.g. planar core
    • 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
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/105—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type having optical polarisation effects

Definitions

  • the present invention relates to a method for producing a preform having a core portion having a rectangular cross section, a method for producing an optical fiber, and an optical fiber.
  • Patent Document 1 As an optical fiber manufacturing method, for example, one described in Patent Document 1 is known.
  • a substantially rectangular columnar core rod is formed, and the substantially rectangular columnar core rod is inserted into a glass tube serving as a clad portion, and heated to melt from the surroundings, whereby a glass tube Is contracted to form an optical fiber preform in which the core rod and the glass tube are integrated. Thereafter, the optical fiber preform is drawn to obtain an optical fiber.
  • the beam intensity emitted from the end of the core of the optical fiber is different from that of the core. In some cases, the intensity is lower than the beam intensity emitted from the portion. For this reason, when laser processing is performed using an optical fiber having such a substantially quadrangular columnar core, it is difficult to process the workpiece uniformly, which may reduce the processing accuracy.
  • An object of the present invention is to provide a preform manufacturing method, an optical fiber manufacturing method, and an optical fiber capable of suppressing deformation of a corner of a core material having a rectangular cross section.
  • the method for producing a preform of the present invention includes a step of preparing a core material having a rectangular cross section, a plurality of clad materials having a refractive index lower than that of the core material, and a jacket tube having a refractive index equivalent to that of the clad material.
  • the core material is contained in the jacket tube, and a plurality of clad materials are filled between the core material and the jacket tube to form an assembly, and the jacket tube and the clad material are collapsed. And forming a preform.
  • a plurality of clad materials are filled between the core material having a rectangular cross section and the jacket tube, and then the assembly is heated to thereby produce the jacket tube and the clad.
  • the material is collapsed, heat is diffused in each clad material, so that concentration of heat at the corners of the core material can be suppressed. Therefore, since the melting of the corner portion of the core material is suppressed, the corner portion of the core material is prevented from being deformed by the surface tension.
  • the softening point of the core material is higher than the softening point of the jacket tube and the clad material, and the step of forming the preform is lower than the softening point of the core material and the jacket tube and the clad material.
  • the assembly is heated at a temperature higher than the softening point of to collapse the jacket tube and the clad material. In this case, since the softening of the core material is prevented, the corner portion of the core material is reliably prevented from being deformed by the surface tension.
  • some of the clad materials have a flat portion, and in the step of forming the assembly, the flat portion of the clad material is in surface contact with the core material.
  • a plurality of clad materials are filled between the core material and the jacket tube.
  • a waveguide material for alignment is further arranged on the side of the core material.
  • a waveguide material for alignment is further arranged on the side of the core material.
  • the thickness of the waveguide material for alignment is equal to the thickness of the core material. In this case, the process of arranging the waveguide material for alignment on the side of the core material can be simplified.
  • the preform is drawn to form an optical fiber having a core section having a rectangular cross section.
  • the optical fiber manufacturing method of the present invention by performing the preform manufacturing method, it is possible to prevent the corner portion of the core material having a rectangular cross section from being deformed as described above.
  • the optical fiber of the present invention includes a core section having a rectangular cross section, an alignment waveguide disposed on the side of the core section, and a cladding section that covers the core section and the alignment waveguide.
  • the present invention it is possible to suppress the deformation of the corners of the core material having a rectangular cross section during the production of the preform.
  • the intensity of the light beam irradiated from the optical fiber can be kept constant, so that the workpiece can be processed uniformly. It becomes possible.
  • FIG. 1 is a cross-sectional view showing a preform manufacturing process which is a part of an embodiment of a method for manufacturing an optical fiber.
  • the optical fiber manufacturing method of the present embodiment manufactures an optical fiber having a core section with a square cross section (hereinafter referred to as “square core fiber”).
  • the rectangular core fiber is an optical fiber that is applied to, for example, laser processing.
  • FIG. 2 is a flowchart showing a procedure of a manufacturing process of the rectangular core fiber including the preform manufacturing process shown in FIG.
  • a rectangular core fiber having a core portion having a square cross section (a ratio of vertical to horizontal size of 1: 1) is manufactured. You may manufacture the square core fiber which has a cross-sectional rectangular core part with a comparatively small aspect ratio.
  • a core material 1 having a square cross section, a plurality of rod clad materials 2 having a circular cross section (columnar shape), and a jacket tube that can accommodate the core material 1 are contained. 3 are prepared (step S101).
  • the rod clad material 2 materials having various diameters are used.
  • the rod clad material 2 and the jacket tube 3 are formed of the same material in the present embodiment, but need only have the same refractive index, and are not limited to the same material.
  • the refractive index of the core material 1 is higher than that of the rod clad material 2 and the jacket tube 3. In other words, the refractive indexes of the rod clad material 2 and the jacket tube 3 are lower than the refractive index of the core material 1.
  • the softening point of the core material 1 is higher than the softening points of the rod clad material 2 and the jacket tube 3.
  • the core material 1 is made of pure silica
  • the rod clad material 2 and the jacket tube 3 are made of fluorine-added silica.
  • the core material 1 is machined so as to have a square cross section, and then the core material 1 is washed with hydrofluoric acid to remove particulate deposits existing on the surface of the core material 1. Further, after the rod clad material 2 is stretched with a heat source, the rod clad material 2 is cut into the same length as the core material 1, and then the rod clad material 2 is washed with hydrofluoric acid, The particulate deposits present in the are removed. Further, impurities and moisture are removed from the inner surface of the jacket tube 3 by vapor-phase etching the inner surface of the jacket tube 3 using a mixed gas containing SF 6 and Cl 2 .
  • the core material 1 is inserted and accommodated in the jacket tube 3 (step S102). Then, the space between the jacket tube 3 and the core material 1 is filled with a plurality of rod clad materials 2 to form an assembly 4 (step S103).
  • the assembly 4 is heated for 60 minutes at a temperature lower than the softening point of the core material 1 and higher than the softening points of the rod clad material 2 and the jacket tube 3 (for example, a temperature of 1000 ° C. or higher) (step S104).
  • a temperature lower than the softening point of the core material 1 and higher than the softening points of the rod clad material 2 and the jacket tube 3 for example, a temperature of 1000 ° C. or higher
  • the softening point of the core material 1 is 1700 ° C.
  • the softening point of the rod clad material 2 and the jacket tube 3 is about 1400 ° C. That is, the heating temperature of the assembly 4 in this case is preferably 1400 ° C. to 1700 ° C.
  • the jacket tube 3 and the rod clad material 2 are collapsed in a state where the pressure in the jacket tube 3 is reduced to, for example, less than 1 kPa (step S105).
  • the jacket tube 3 and the rod clad material 2 are melted and integrated, and a preform 5 as shown in FIG. 1B is formed.
  • the preform 5 includes a core section 6 having a square cross section and a clad section 7 having a circular section that covers the periphery of the core section 6.
  • the heating temperature is set so that the viscosity of the core portion 6 is higher than the viscosity of the jacket tube 3 and the rod clad material 2.
  • the core material 1 having a square section is inserted into the jacket tube 3
  • a plurality of heat capacities smaller than air are provided in the space between the jacket tube 3 and the core material 1.
  • the rod clad material 2 is filled. For this reason, when the assembly 4 is subsequently heated, the heat diffuses into the rod clad material 2, and the concentration of heat on the corners of the core material 1 is suppressed. By suppressing the concentration of heat in this way, melting of the corners of the core material 1 can be suppressed, and deformation of the corners of the core material 1 due to surface tension can be prevented.
  • the intensity of the light beam emitted from the core portion of the rectangular core fiber becomes uniform. Processing accuracy can be increased.
  • FIG. 3 is a cross-sectional view showing a preform manufacturing process which is a part of another embodiment of the optical fiber manufacturing method.
  • the same reference numerals are given to the same elements as those in the above-described embodiment, and the description thereof is omitted.
  • FIG. 4 is a flowchart showing the procedure of the manufacturing process of the rectangular core fiber including the preform manufacturing process shown in FIG.
  • a rectangular core fiber having a core portion having a rectangular cross section with a relatively large vertical / horizontal size ratio (for example, 1:50) is manufactured.
  • the jacket tube 3 that can accommodate the core material 11 is prepared (step S111).
  • Two core reinforcing clad members 12A and 12B are used.
  • the core reinforcing clad materials 12A and 12B are made of the same material as the rod clad material 2, for example.
  • the refractive indexes of the rod clad material 2, the jacket tube 3, and the core reinforcing clad materials 12 ⁇ / b> A and 12 ⁇ / b> B are lower than the refractive index of the core material 11.
  • the softening point of the core material 11 is higher than the softening points of the rod clad material 2, the jacket tube 3, and the core reinforcing clad materials 12A and 12b.
  • the core material 11 is made of pure silica.
  • the core material 11 and the core reinforcing clad materials 12A and 12B are inserted and accommodated in the jacket tube 3 (step S112).
  • the core material 11 is sandwiched between the two core reinforcing clad materials 12A in the vertical direction and the core material 11 is sandwiched between the two core reinforcing clad materials 12B in the left-right direction.
  • Core reinforcing clad materials 12A and 12B are disposed.
  • the entire side surface of the core material 11 comes into surface contact with the core reinforcing clad materials 12A and 12B.
  • the jacket tube 3 is rotated to tilt the core reinforcing clad material 12A, 12B.
  • the core material 11 is inserted into the jacket tube 3 and disposed at a predetermined position, and then the other core reinforcing clad materials 12A and 12B are inserted into the jacket tube 3 and disposed at the predetermined position.
  • the core material 11 can be positioned with good stability.
  • a plurality of rod clad materials 2 are filled in a space between the jacket tube 3 and the core reinforcing clad materials 12 ⁇ / b> A and 12 ⁇ / b> B to form an assembly 13. (Step S113).
  • step S114 the assembly 13 is heated for a predetermined time in the same manner as in step S104 shown in FIG. 1 (step S114).
  • the jacket tube 3, the rod clad material 2, and the core reinforcing clad materials 12A and 12B are collapsed in the same manner as in step S105 shown in FIG. 1 (step S115).
  • a preform 14 as shown in FIG. 3B is formed.
  • the preform 14 includes a core section 15 having a rectangular cross section and a clad section 16 having a circular section that covers the periphery of the core section 15.
  • the assembly 13 is subsequently heated.
  • the core material 11 is hardly softened.
  • the pressure when the jacket tube 3, the rod clad material 2 and the core reinforcing clad materials 12A and 12B contract during the collapse is as follows. It becomes difficult to join the core material 11. Therefore, even if the core material 11 is sufficiently thin, the deformation of the core material 11 can be prevented.
  • the core material 11 is sandwiched between the core reinforcing clad materials 12A and 12B, the concentricity of the core part of the manufactured square core fiber, that is, the degree of coincidence between the center of the fiber and the center of the core part is increased. can do.
  • FIG. 5 is a cross-sectional view showing a preform manufacturing process which is a part of still another embodiment of the optical fiber manufacturing method.
  • the same reference numerals are given to the same elements as those in the above-described embodiment, and the description thereof is omitted.
  • FIG. 6 is a flowchart showing the procedure of the manufacturing process of the rectangular core fiber including the preform manufacturing process shown in FIG.
  • a rectangular core fiber is manufactured in which waveguides for alignment are arranged on both the left and right sides of a core portion having a rectangular cross section.
  • Material 2 two cross-sectionally rectangular core reinforcing clad materials 12 ⁇ / b> A, two cross-sectionally rectangular core reinforcing clad materials 12 ⁇ / b> B, two circular cross-sectional spacer cladding materials 21, and a jacket tube 3 are prepared (step S121).
  • the waveguide material 20 for alignment is made of, for example, the same material as the core material 11 and has the same refractive index and softening point as the core material 11. Further, the cross-sectional dimension (length of each side) of the waveguide member 20 for alignment is equal to the thickness (height) of the core material 11.
  • the spacer cladding material 21 may have a square cross section.
  • the core material 11, the alignment waveguide material 20, the core reinforcing clad materials 12A and 12B, and the spacer clad material 21 are inserted and accommodated in the jacket tube 3 (step S122).
  • the waveguide material 20 for alignment is arranged on both the left and right sides of the core material 11 via the spacer cladding material 21, and in this state, the core material 11 and each alignment are formed by the two core reinforcing cladding materials 12A.
  • Each core reinforcing clad material 12A is sandwiched between two core reinforcing clad members 12B in the left-right direction and sandwiching the core material 11 and each aligning waveguide member 20 in the left-right direction. , 12B.
  • the jacket tube 3 is rotated to tilt the core reinforcing clad material 12A, 12B.
  • one alignment waveguide member 20, one spacer cladding member 21, core material 11, the other spacer cladding member 21, and the other alignment waveguide member 20 are sequentially jacketed.
  • the other core reinforcing clad materials 12A and 12B are inserted into the jacket tube 3 and disposed at a predetermined position by being inserted into the tube 3 and disposed at a predetermined position.
  • a plurality of rod clad materials 2 are filled in the space between the jacket tube 3 and the core reinforcing clad materials 12 ⁇ / b> A and 12 ⁇ / b> B to form an assembly 22. (Step S123).
  • step S104 shown in FIG. 1 the assembly 22 is heated for a predetermined time (step S124), and then the jacket tube 3, the rod clad material 2, and the core reinforcing clad materials 12A and 12B are collapsed ( Step S125).
  • a preform 23 as shown in FIG. 5B is formed.
  • the preform 23 has a rectangular core section 15, a pair of alignment waveguides 24 disposed on the left and right sides of the core section 15, and the periphery of the core section 15 and each alignment waveguide 24. It consists of a clad portion 25 having a circular cross section.
  • an optical fiber array may be used to introduce light into the rectangular core fiber.
  • the width of the core portion of the square core fiber is large, a desired alignment accuracy may not be obtained when the optical fiber array and the square core fiber are aligned.
  • waveguides for alignment are arranged on both the left and right sides of the core portion of the rectangular core fiber. Therefore, the optical fiber array and the rectangular core fiber are aligned using these alignment waveguides. can do. Specifically, light is incident on each waveguide for alignment, and the light intensity emitted from each waveguide for alignment is measured with a power meter. Thereby, the desired alignment precision with an optical fiber array and a rectangular core fiber is securable.
  • the size of the waveguide for alignment is desirably about the same as the fiber core diameter of the optical fiber array to be connected.
  • FIG. 7 is a cross-sectional view showing a modification of the preform production process shown in FIG.
  • the thickness of the core material 11 is larger than the cross-sectional dimension (length of each side) of the waveguide material 20 for alignment.
  • four spacer clad members 30 having a rectangular cross section may be prepared separately, and these spacer clad members 30 may be disposed below and above each alignment waveguide member 20.
  • the present invention is not limited to the above embodiment.
  • the core reinforcing clad materials 12 ⁇ / b> A and 12 ⁇ / b> B having a rectangular cross section are brought into surface contact with the core material 11 having a rectangular cross section when the assembly is formed.
  • the core reinforcing clad material is not particularly limited to those having a rectangular cross section, and a core reinforcing clad material having a flat portion is used, and the flat portion of the core reinforcing clad material is used as a core material 11 having a rectangular cross section. You may make surface contact.

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  • Engineering & Computer Science (AREA)
  • 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)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

Selon la présente invention, lors de la production d'une fibre optique comprenant une partie coeur de section transversale carrée, un élément formant coeur (1) de section transversale carrée, une pluralité d'éléments formant gaine en tiges (2) de section transversale circulaire et un tube formant protection (3) sont d'abord préparés. Ensuite, l'élément formant coeur (1) est inséré dans le tube formant protection (3), et à l'état logé, lesdits éléments formant gaine en tiges (2) remplissent l'espace entre le tube formant protection (3) et l'élément formant coeur (1), de manière à former un ensemble (4). Ensuite, l'ensemble (4) est chauffé pendant une durée prédéterminée à une température inférieure au point de ramollissement de l'élément formant coeur (1) et supérieure au point de ramollissement des éléments formant gaine en tiges (2) et du tube formant protection (3), le tube formant protection (3) et les éléments formant gaine en tiges (2) s'affaissant alors pour former une préforme (5). Ensuite, la préforme (5) est étirée, formant alors une fibre optique.
PCT/JP2011/072278 2010-09-30 2011-09-28 Procédé de préparation d'une préforme, procédé de production d'une fibre optique, et fibre optique WO2012043675A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020137010547A KR20140009156A (ko) 2010-09-30 2011-09-28 프리폼의 제작 방법, 광섬유의 제조 방법 및 광섬유
CN201180047403.6A CN103153889B (zh) 2010-09-30 2011-09-28 预成形体的制作方法、光纤的制造方法及光纤

Applications Claiming Priority (2)

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JP2010221014A JP5750853B2 (ja) 2010-09-30 2010-09-30 プリフォームの作製方法、光ファイバの製造方法及び光ファイバ
JP2010-221014 2010-09-30

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WO2012043675A1 true WO2012043675A1 (fr) 2012-04-05

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JP (1) JP5750853B2 (fr)
KR (1) KR20140009156A (fr)
CN (1) CN103153889B (fr)
TW (1) TW201227018A (fr)
WO (1) WO2012043675A1 (fr)

Cited By (3)

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WO2013170254A1 (fr) 2012-05-11 2013-11-14 Ofs Fitel, Llc Fibre optique barbell et son procédé de fabrication
CN108975675A (zh) * 2018-09-26 2018-12-11 武汉长盈通光电技术有限公司 方型芯光纤及其制备方法
CN111918844A (zh) * 2018-05-28 2020-11-10 莱尼电缆有限责任公司 制造用于生产多芯纤维的预制件的方法及预制件和多芯纤维

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KR101875779B1 (ko) * 2016-06-10 2018-07-09 크루셜머신즈 주식회사 광 균질화 장치
CN109445019B (zh) * 2018-11-02 2020-10-09 北京大学 一种矩形纤芯结构光纤
WO2023191188A1 (fr) * 2022-03-31 2023-10-05 연세대학교 산학협력단 Fibre optique de grand diamètre ayant une grande surface de mode, et procédé de fabrication associé

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JP2008247740A (ja) * 2003-10-30 2008-10-16 Sumitomo Electric Ind Ltd 光ファイバ母材及びその製造方法
JP2005196031A (ja) * 2004-01-09 2005-07-21 Fuji Photo Film Co Ltd 光ファイバーとその製造方法及び画像形成装置
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Cited By (5)

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Publication number Priority date Publication date Assignee Title
WO2013170254A1 (fr) 2012-05-11 2013-11-14 Ofs Fitel, Llc Fibre optique barbell et son procédé de fabrication
EP2847628A4 (fr) * 2012-05-11 2016-05-25 Ofs Fitel Llc Fibre optique barbell et son procédé de fabrication
CN111918844A (zh) * 2018-05-28 2020-11-10 莱尼电缆有限责任公司 制造用于生产多芯纤维的预制件的方法及预制件和多芯纤维
US11866360B2 (en) 2018-05-28 2024-01-09 J-Fiber Gmbh Method for producing a preform for producing a multicore fibre and also a preform and a multicore fibre
CN108975675A (zh) * 2018-09-26 2018-12-11 武汉长盈通光电技术有限公司 方型芯光纤及其制备方法

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TW201227018A (en) 2012-07-01
CN103153889B (zh) 2015-04-15
JP5750853B2 (ja) 2015-07-22
KR20140009156A (ko) 2014-01-22
JP2012076936A (ja) 2012-04-19
CN103153889A (zh) 2013-06-12

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