WO1996028750A1 - Procede de traitement de la surface d'extremite d'une fibre optique - Google Patents

Procede de traitement de la surface d'extremite d'une fibre optique Download PDF

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Publication number
WO1996028750A1
WO1996028750A1 PCT/JP1995/000432 JP9500432W WO9628750A1 WO 1996028750 A1 WO1996028750 A1 WO 1996028750A1 JP 9500432 W JP9500432 W JP 9500432W WO 9628750 A1 WO9628750 A1 WO 9628750A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical fiber
face
mold
shape
processing
Prior art date
Application number
PCT/JP1995/000432
Other languages
English (en)
Japanese (ja)
Inventor
Hiroaki Furuichi
Hiroyasu Sasaki
Hideo Sotakawa
Osamu Yamada
Toshiyuki Arai
Hitoshi Kubota
Hiroaki Shishido
Hiroyoshi Matsumura
Original Assignee
Hitachi, Ltd.
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 Hitachi, Ltd. filed Critical Hitachi, Ltd.
Priority to PCT/JP1995/000432 priority Critical patent/WO1996028750A1/fr
Publication of WO1996028750A1 publication Critical patent/WO1996028750A1/fr

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Classifications

    • 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
    • G02B6/24—Coupling light guides
    • G02B6/255—Splicing of light guides, e.g. by fusion or bonding
    • G02B6/2552—Splicing of light guides, e.g. by fusion or bonding reshaping or reforming of light guides for coupling using thermal heating, e.g. tapering, forming of a lens on light guide ends

Definitions

  • the present invention provides a method of processing the end face shape of an optical fiber, a processing mold suitable for the processing, and an end-processed light manufactured using the same, in order to efficiently couple the optical fiber and the optical element. It is about fiber. Background art
  • the above-mentioned processing method involves processing by mechanical polishing and then heating and melting by arc discharge, etc., which requires two steps of work, which has the problem of increasing the cost of the finished product. .
  • a plurality of optical fibers arranged in an array cannot be machined at the tip end because a plurality of optical fibers cannot be mechanically polished at the same time.
  • a plastic optical filter having a low softening temperature is used. There was also a problem that only Aiva could be processed.
  • An object of the present invention is to solve such a problem and improve the coupling efficiency of the optical fiber by processing the tip of the optical fiber into a conical shape or a spherical lens shape, thereby reducing the cost.
  • the present invention provides a method for heating and melting an end face of an optical fiber, pressing the end face of the optical fiber into a mold having a predetermined shape, and transferring the shape of the mold to the end face of the optical fiber. It is characterized in that the end face shape is formed.
  • the shape transfer surface of the fixed-shaped mold has a lens shape.
  • the shape transfer surface of the fixed shape mold has a spherical lens shape.
  • an optical fiber cladding in which the shape transfer surface of the fixed mold has a spherical lens shape, and the radius of the spherical surface is at least half the diameter of the core portion of the optical fiber. It is characterized by being less than half the outer diameter of the part.
  • the shape transfer surface of the fixed shape mold has a parabolic aspheric lens shape.
  • the shape transfer surface of the fixed shape mold has a hyperbolic aspheric lens shape.
  • a concave portion is provided at a central portion of a shape transfer surface of a fixed-shaped mold.
  • the present invention is characterized in that, as another mode, a through hole is provided at a central portion of a shape transfer surface of a fixed-shaped mold.
  • a fixed shape mold having a through hole at a central portion of a shape transfer surface, and the radius of the through hole is equal to the diameter of the core portion of the optical fiber. It is characterized in that it is smaller than half of the outer diameter of the optical fiber cladding by more than half of the optical fiber.
  • means for heating and melting an end face of an optical fiber means for positioning the end face of the optical fiber in a mold having a predetermined shape, and means for pressing the end face of the optical fiber to the mold.
  • the end face adding device of the optical fiber is constituted.
  • an optical fiber having a through hole at a center portion of a shape transfer surface of a fixed shape mold, and the through hole has a radius equal to or more than half the diameter of an optical fiber core.
  • the end face of the optical fiber is made smaller than half the outer diameter of the cladding part.
  • a plurality of optical fibers are arranged in an array at the same center interval as the arrangement interval of the optical fibers to form a mold for processing the end face of the optical fiber.
  • an optical fiber having a processed end surface in which only the core portion of the optical fiber and the peripheral portion of the core of the clad portion have free-form end surfaces.
  • the present invention is directed to an optical fiber configured to have a concave portion and a convex portion that can be fitted to a core portion of an optical fiber end face and a core peripheral portion of the cladding portion.
  • an optical fiber configured to have a concave portion and a convex portion that can be fitted to a core portion of an optical fiber end face and a core peripheral portion of the cladding portion.
  • the end face of an optical fiber made of Siri force or a composite material glass having a high softening temperature is heated and melted by arc discharge, etc. Since the configuration of the mold is transferred to the end face of the optical fiber, the end of the optical fiber does not need to be processed by mechanical polishing so as to be conical, and the end face of the optical fiber can be processed by one process. Processing can be performed.
  • the shape transfer surface of the fixed mold The light coupling efficiency can be easily increased because of the shape, especially the spherical lens shape.
  • the radius of the spherical lens shape is at least half the diameter of the core part of the optical fiber and less than half the outer diameter of the cladding part of the optical fiber, the light incident on the optical fiber can be collected.
  • the lens shape is optimal, and the light coupling efficiency can be easily increased.
  • the light coupling efficiency can be easily improved by forming the shape transfer surface of the fixed shape mold into a lens shape, in particular, a parabolic aspherical lens shape or a hyperbolic aspherical lens shape. Can be higher.
  • the concave portion or the through hole is provided at the center of the shape transfer surface of the fixed shape mold, the core portion of the optical fiber and the Only the periphery of the core of the cladding does not come into contact with the shape transfer surface.
  • the surface tension of the material around the core of the optical fiber and the core of the cladding makes it possible to cure the surface in a free-curved surface and easily stain.
  • a lens surface free of voids and voids can be formed on the end surface of the optical fiber.
  • the radius of the through hole at the center of the shape transfer surface of the fixed shape mold is set to be at least half of the diameter of the core of the optical fiber and smaller than half of the outer diameter of the cladding of the optical fiber.
  • a plurality of molds are arranged in an array at the same center interval as an arrangement interval of a plurality of optical fibers arranged in an array, and a plurality of molds are arranged in an array. Since the end faces of a plurality of optical fibers can be processed at the same time, a die for processing the end faces of a plurality of optical fibers arranged in an array can be easily configured.
  • FIG. 1 is a perspective view illustrating a first embodiment of a method for processing an end face of an optical fiber according to the present invention
  • FIG. 2 is a cross-sectional view of a main part of FIG. 1 as viewed from a side.
  • Fig. 3 is a cross-sectional view of the end face of the optical fiber processed by the optical fiber end face processing method of Fig. 2, and Fig. 4 is the radius of the tip of the optical fiber, the light incident angle, and the core diameter.
  • FIG. 5 is a cross-sectional view of a main part of the embodiment having a through hole in the center of the shape transfer surface of the mold as viewed from the side.
  • FIG. 6 is an end face processing of the optical fiber of FIG. It is sectional drawing of the end surface of the optical fiber processed by the method.
  • FIG. 7 is a cross-sectional view of the main part of the embodiment in the case where a convex portion is provided at the center of the shape transfer surface of the mold as viewed from the side
  • FIG. 8 is an end face processing of the optical fiber of FIG.
  • FIG. 9 is a cross-sectional view of the end face of the optical fiber processed by the method
  • FIG. 9 is a perspective view showing the end face processing of the arrayed optical fiber.
  • FIG. 10 is a perspective view showing an optical fiber connector.
  • FIG. 1 is a perspective view illustrating a first embodiment of an optical fiber end face processing method of the present invention.
  • FIG. 2 is a cross-sectional view of the main part of (Fig. 1) viewed from the side.
  • the optical fiber is generally covered on its surface with a cladding material 3 inside which is surrounded by a core 1 having a high refractive index and a cladding 2 having a slightly lower refractive index. It has a structure.
  • the direction of the optical axis of the optical fiber is defined as the Z-axis direction as shown in (Fig. 1).
  • the end face of the optical fiber is positioned by removing the covering material 3 from the surface and then passing the core 1 and the clad 2 through the tapered hole 71 of the positioning member 7. Then, arc discharge is applied to the arc discharge electrode 4 with the tip of the core 1 and the clad 2 facing each other, as shown in 41, heated and melted.
  • arc discharge is used as the method of heating and melting, but another method such as H 2 -02 flame or CO 2 laser may be used.
  • the tip portions of the core 1 and the clad 2 are moved downward in the Z-axis direction onto the shape transfer surface of the concave portion 6 having a fixed shape of the mold 5 connected to the positioning member 7 by the fixing pin 8, and the concave portion 6 is formed.
  • the shape of the concave portion 6 is transferred to the end surfaces of the optical fiber core 1 and the cladding 2 by applying pressure to the center of the optical fiber.
  • the material of the mold 5 for example, SiC, TiC, tool steel, Ni-based heat-resistant metal and the like are optimal.
  • the tip of the core 1 and the clad 2 are moved upward in the Z-axis direction, separated from the transfer surface of the recess 6, and the end face of the optical fiber is convex as shown in (Fig. 3). Is formed.
  • Fig. 3 the material of the mold 5
  • the diameter of the core 1 is D a
  • the diameter of the clad 2 is D b
  • the radius of the spherical recess 61 at the center of the recess 6 is R
  • the light incident on the optical fiber is collected. It is assumed that the spherical lens shape is the most suitable.
  • the emitted light 91 from the semiconductor laser 9 generally has a divergence angle of about 30 to 50 degrees, and couples light to the core 1 of the optical fiber with little loss of light.
  • the radius R c of the tip of the optical fiber is generally larger than half the diameter D a of the core 1 and is smaller than the diameter Da of the core 1.
  • the outer diameter Db of the cladding 2 be smaller than half.
  • the smaller the radius Rc of the tip of the optical fiber the higher the coupling efficiency. Therefore, the radius R of the spherical concave portion 6 1 at the center of the concave portion 6 in FIG. 2 is set to be smaller than half the outer diameter Db of the optical fiber clad 2 at least half the diameter Da of the core 1 and smaller than the diameter Db of the optical fiber clad 2.
  • a lens with high coupling efficiency can be formed at the tip of the fiber.
  • the shape of the shape transfer surface of the concave portion 6 is a spherical shape, an aspherical surface (not shown) such as a parabola or a hyperbola may be any shape having a lens effect.
  • FIG. 5 has a through hole 62 having a diameter Dc at the center of the shape transfer surface of the mold 6, and the other parts are the same as those of the above embodiment.
  • the end face of the optical fiber is pressed into the mold, only the core 1 of the optical fiber and the periphery of the core of the clad 2 are opposed to the through hole 62, so that they come into contact with the shape transfer surface.
  • the surface tension of the material around the core of the optical fiber and the core of the clad is hardened with the free-form surface 11 as shown in Fig.
  • the surface can be formed on the end face of the optical fiber.
  • the configuration is such that the radius Dc of the through hole 62 is larger than the diameter Dc of the optical fiber core 1 and is smaller than half the outer diameter Db of the optical fiber cladding 2 at least half of the diameter Da of the optical fiber core 1.
  • FIG. 7 has a projection 63 at the center of the shape transfer surface of the mold 6, and is otherwise the same as the previous embodiment.
  • the convex portion 63 comes into contact with the core 1 portion of the optical fiber and the periphery of the core of the cladding portion, so that the concave portion 12 shown in FIG. Can be formed on the end face of the optical fiber.
  • an optical fiber having a lens effect on the end face can be easily formed. It can also be applied to creating.
  • FIG. 9 is a diagram showing an end face addition of an arrayed optical fiber.
  • the coating materials 3a, 3b, 3c, 3d and the claddings 2a, 2b, 2c, 2d of each optical fiber are arranged at a fixed center interval K on the array fixing member 21 and the four arrays facing each other are arranged.
  • the mold 51 also has four recesses 6a, 6b, 6c, 6d arranged at a constant center interval K.
  • the end faces of the four optical fibers are simultaneously heated and melted by arc discharge or the like (electrodes not shown), and then added to the concave portions 6a, 6b, 6c, 6d of the mold 51. Pressed and separated, the end faces of each optical fiber are processed simultaneously.
  • arc discharge or the like electrodes not shown
  • FIG. 10 shows a connector configuration for coupling a tape fiber 3 la and a tape fiber 31 b in which four optical fibers are bundled at regular intervals. After removing the covering material, the ends of each of the four optical fibers of the tape fins 3 la and 3 1 b are aligned with the grooves of the connector cases 32 a and 32 b, respectively, It is fixed at 33a and 33b.
  • Connector case 3 2 b has a tapered tip for mating connector
  • the pin 34 has a mating groove 35 in the connector case 32a so that the connectors can be easily positioned.
  • the end faces of the respective fibers were previously formed with concave portions 22 a, 23 a, 24 a, and 25 a of the fiber end faces on the connector case 32 a side by using the method of the above embodiment.
  • On the connector case 32b side there is a convex part 2 2b, 2 of the fiber end face large enough to fit the concave part 22a, 23a, 24a, 25a of the fiber end face. 3 b, 24 b, and 25 b are similarly formed.
  • the concave portions 22a, 23a, 24a and 25a on the fiber end face can be easily formed.
  • the core portion is located between the concave portions 22a, 23a, 24a, 25a on the fiber end surface and the convex portions 22b, 23b, 24b, 25b on the fiber end surface.
  • the end face of the optical fiber is heated and melted, pressed into a mold having a predetermined shape, and the shape of the mold is transferred to the end face of the optical fiber to form the end face shape of the optical fiber.
  • the shape transfer surface of a fixed shape mold should be a lens shape, especially a spherical lens Because of the configuration, the light coupling efficiency can be easily increased.
  • the light entering the optical fiber is condensed by configuring the spherical lens shape radius to be at least half the diameter of the core of the optical fiber and less than half the outer diameter of the cladding of the optical fiber.
  • the lens shape is the most suitable, and the light coupling efficiency can be easily increased.
  • the light transfer efficiency can be easily increased by forming the shape transfer surface of the fixed shape mold into a lens shape, in particular, a parabolic aspherical lens shape or a hyperbolic aspherical lens shape. .
  • a concave or through hole is provided at the center of the shape transfer surface of the fixed shape mold, when the end face of the optical fiber is pressed against the mold, the core and clad portions of the optical fiber are pressed. Only the periphery of the core does not come into contact with the shape transfer surface, and the surface tension of the material around the core of the optical fiber and the core of the cladding makes it possible to cure the surface in a free-curved surface, easily removing dirt and voids.
  • An empty lens surface can be formed on the end face of the optical fiber.
  • the radius of the through hole at the center of the shape transfer surface of the fixed shape mold is more than half the diameter of the core of the optical fiber and smaller than half the outer diameter of the cladding of the optical fiber. -The state of the hardened free-form surface becomes the optimal lens shape for condensing the light incident on the optical fiber, and the light coupling efficiency can be easily increased.
  • An optical fiber connector composed of optical fibers having concave and convex shapes that can be fitted around the core of the optical fiber end face and the core periphery of the cladding, which is simple and easy. An optical fiber connector with small coupling loss can be easily configured.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

L'invention concerne un procédé de traitement de la surface d'extrémité d'une fibre optique, destiné à permettre une connexion efficace entre une fibre optique et un élément optique, un moule adapté à ce traitement et la fibre optique dont la surface d'extrémité est traitée au moyen de ce procédé et de ce moule. Le procédé consiste à chauffer et à faire fondre la surface d'extrémité d'une fibre optique, à insérer celle-ci sous pression dans un moule en forme de lentille et à transférer la configuration du moule sur la surface de l'extrémité de la fibre optique, de sorte qu'une configuration prédéterminée soit formée sur celle-ci. Le moule est adapté à ce traitement et la fibre optique a une surface d'extrémité traitée au moyen du procédé et du moule décrits. D'après ce procédé, comme on peut former une configuration prédéterminée sur une surface d'extrémité de la fibre optique en un seul processus, par les opérations mentionnées de chauffage et fusion, insertion sous pression et transfert, il est possible, non seulement d'éviter l'augmentation des coûts des produits finis, mais aussi de traiter plusieurs fibres optiques en même temps.
PCT/JP1995/000432 1995-03-15 1995-03-15 Procede de traitement de la surface d'extremite d'une fibre optique WO1996028750A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP1995/000432 WO1996028750A1 (fr) 1995-03-15 1995-03-15 Procede de traitement de la surface d'extremite d'une fibre optique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1995/000432 WO1996028750A1 (fr) 1995-03-15 1995-03-15 Procede de traitement de la surface d'extremite d'une fibre optique

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WO1996028750A1 true WO1996028750A1 (fr) 1996-09-19

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998047045A2 (fr) * 1997-04-11 1998-10-22 Digital Optics Corporation Procedes de formage de barreaux optiques comprenant des motifs tridimensionnels sur leurs surfaces terminales
GB2439946A (en) * 2006-07-10 2008-01-16 Schlumberger Holdings An apparatus for forming an optical fibre device
GB2466893A (en) * 2006-07-10 2010-07-14 Schlumberger Holdings A method of forming an optical fibre device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5389751A (en) * 1977-01-19 1978-08-07 Nippon Telegr & Teleph Corp <Ntt> Optical fiber end part and its production
JPS5541430A (en) * 1978-09-18 1980-03-24 Toshiba Corp Optical signal transmitter
JPS5659213A (en) * 1979-10-19 1981-05-22 Matsushita Electric Ind Co Ltd Connecting method of optical fiber
JPS58118403U (ja) * 1982-02-04 1983-08-12 富士通株式会社 光フアイバ加工治具
JPS5974503A (ja) * 1982-10-22 1984-04-27 Sumitomo Electric Ind Ltd 赤外光用フアイバおよびその製造方法
JPS61236503A (ja) * 1985-04-12 1986-10-21 Matsushita Electric Ind Co Ltd 光フアイバ−端面形成方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5389751A (en) * 1977-01-19 1978-08-07 Nippon Telegr & Teleph Corp <Ntt> Optical fiber end part and its production
JPS5541430A (en) * 1978-09-18 1980-03-24 Toshiba Corp Optical signal transmitter
JPS5659213A (en) * 1979-10-19 1981-05-22 Matsushita Electric Ind Co Ltd Connecting method of optical fiber
JPS58118403U (ja) * 1982-02-04 1983-08-12 富士通株式会社 光フアイバ加工治具
JPS5974503A (ja) * 1982-10-22 1984-04-27 Sumitomo Electric Ind Ltd 赤外光用フアイバおよびその製造方法
JPS61236503A (ja) * 1985-04-12 1986-10-21 Matsushita Electric Ind Co Ltd 光フアイバ−端面形成方法

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998047045A2 (fr) * 1997-04-11 1998-10-22 Digital Optics Corporation Procedes de formage de barreaux optiques comprenant des motifs tridimensionnels sur leurs surfaces terminales
WO1998047045A3 (fr) * 1997-04-11 1999-03-04 Digital Optics Corp Procedes de formage de barreaux optiques comprenant des motifs tridimensionnels sur leurs surfaces terminales
US5996376A (en) * 1997-04-11 1999-12-07 Digital Optics Corporation Methods of forming optical rods including three-dimensional patterns on end faces thereof
GB2439946A (en) * 2006-07-10 2008-01-16 Schlumberger Holdings An apparatus for forming an optical fibre device
US7634168B2 (en) 2006-07-10 2009-12-15 Schlumberger Technology Corporation Apparatus and method for forming an optical fiber device
GB2439946B (en) * 2006-07-10 2010-06-23 Schlumberger Holdings Apparatus for forming an optical fiber device
GB2466893A (en) * 2006-07-10 2010-07-14 Schlumberger Holdings A method of forming an optical fibre device
GB2466893B (en) * 2006-07-10 2011-01-26 Schlumberger Holdings Method for forming an optical fiber device

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