WO1996010202A1 - Procede d'introduction d'elements de fibre optique dans un tube - Google Patents

Procede d'introduction d'elements de fibre optique dans un tube Download PDF

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Publication number
WO1996010202A1
WO1996010202A1 PCT/GB1995/002307 GB9502307W WO9610202A1 WO 1996010202 A1 WO1996010202 A1 WO 1996010202A1 GB 9502307 W GB9502307 W GB 9502307W WO 9610202 A1 WO9610202 A1 WO 9610202A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
strip
edge portions
optical fibre
upstanding
Prior art date
Application number
PCT/GB1995/002307
Other languages
English (en)
Inventor
Trevor Lawrence Carr
Original Assignee
Bicc Public Limited Company
CARR, Vivien, Mary
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 Bicc Public Limited Company, CARR, Vivien, Mary filed Critical Bicc Public Limited Company
Priority to AU35720/95A priority Critical patent/AU3572095A/en
Publication of WO1996010202A1 publication Critical patent/WO1996010202A1/fr

Links

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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4479—Manufacturing methods of optical cables
    • G02B6/4486—Protective covering
    • G02B6/4488—Protective covering using metallic tubes

Definitions

  • This invention relates to optical fibre elements and to their introduction into a metal tube.
  • Optical fibres are widely used in electrical conductors for the transmission of data along electrical power lines.
  • the optical fibres are loosely housed in a metal tube or similar of the same dimensions as the strands of the conductor so that the tube can replace one of the conductor strands.
  • One method of forming a metal tube about an optical fibre is described in European patent application No.299, 123 and comprises folding lateral edges of a strip of metal together by means of a series of rollers to form a tube having a longitudinally extending slot, inserting the optical fibre into the tube through the slot, and welding the edges of the tube together by means of a laser.
  • Such a method can be used to form tubes of typical diameter 2 mm that contain one or more optical fibres, are hermetically sealed and which may be provided internally with a filling of gel.
  • the laser welding head is directed toward the longitudinal slot of the tube, and there is the possibility that the laser could damage a portion of the optical fibre if the fibre comes into line with the laser beam.
  • This problem is recognised in the patent application, and the solution to the problem is to focus the laser beam above the surface of the tube so that if any of the laser beam enters the tube through the slot the beam will diverge and will not focus on the optical fibres.
  • the possibility remains that the laser beam will damage the optical fibre or fibres within the tube, especially if there are any vibrations in the width of the metal strip from which the tube is formed which could lead to local widening of the longitudinally extending slot.
  • a method of enclosing one or more optical fibre elements in a metal tube so that the or each element is loosely housed within the tube which comprises the steps of:
  • one of the edge portions may be formed of greater width than the other edge portion and part of the wider edge portion be folded over the other edge portion once they have been brought together. If the opposite sides of the seam are pressed together with sufficient force it is possible to form a hermetic seal. However, it is preferred to weld the two edge portions together in order to ensure that the seam is impervious to moisture ingress.
  • any appropriate welding process may be employed for this purpose, for example, cold pressure welding, seam welding, resistance welding, TIG welding or the like, provided that the welding operation does not expose the optical fibre elements to so high a temperature, for example temperatures significantly above 85°C.
  • the edge portions may advantageously be sealed by a laser welding method, for example of the type described in European patent application No.299, 123, but in this case the laser welding head can be rotated so that it is directed substantially longitudinally to the tube rather than radially to it, and so prevent the risk of the laser beam damaging the optical fibre element.
  • Any appropriate type of laser for example carbon dioxide, or Nd:YAG may be used.
  • the use of a laser has the advantage that the heat affected area is small and a well defined weld bead is formed. Whichever method of welding is employed, the method has the advantage that the weld site is relatively far from the optical fibre element and so the element is less likely to be damaged by the welding operation.
  • One or more optical fibre elements may be employed in the method according to the invention, and the or each optical fibre element may comprise one or more optical fibres.
  • the method may be used to locate individual optical fibres in the tube, optical fibre ribbon cables or stacks of optical fibre ribbon cables.
  • the metal is preferably stainless steel, aluminium or combinations thereof, for example aluminium clad stainless steel.
  • the tube can be drawn down if desired after it has been formed, although this is not recommended, partly due to the fact that it is not possible to anneal the tube without damaging the fibre element, and it is not possible to draw down the tube by more than about 10 to 20% in the case of stainless steel before annealing is necessary. Furthermore, drawing the tube down may put the fibre element under tension, whereas it is normally required to have a slight excess length of fibre in the tube, normally in the region of four to ten parts per thousand.
  • Figure 1 shows schematically the forming operations on the strip of metal during the method and shows cross sections of the strip at different stages during the method;
  • FIG. 2 shows cross sections of the sheet during an alternative method according to the invention with the thickness of the weld section exaggerated for the sake of clarity.
  • a strip 1 of stainless steel is passed through a first forming station in which an edge portion 2 and 4 on each side of the strip is bent so that it stands perpendicularly to the plane of the strip.
  • the strip then moves to a second forming station where opposite sides of the strip are folded over to form a tube 6 having a longitudinally extending slot 8 between the upstanding edge portions.
  • an optical fibre 10 is introduced into the tube by means of a fibre guide tube 12.
  • a hydrophobic gel is introduced by means of a second tube 14.
  • One edge portion of the strip is slightly taller than the other, so that they can be welded together by means of a laser welding head 16. Once the edge portions have been welded together the upstanding flange formed by the edge portions is flattened at another station to produce the final product. As shown in figure 2, the width of the first edge portion 2 is significantly higher than that of the other edge portion 4. Once the edge portions have been welded by the laser welding head 16, the taller of the two edge portions is folded over the shorter edge portion and the upstanding flange so formed is flattened a shown in figure 1.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Laser Beam Processing (AREA)

Abstract

Procédé d'introduction d'un ou plusieurs éléments de fibre optique dans un tube en métal, de telle façon que cet élément, ou ces éléments, logent à l'intérieur du tube sans y être serrés. Ce procédé consiste en les étapes suivantes: (i) passage d'une bande (1) en métal dans un ou plusieurs gabarits, de manière à incurver hors du plan de la bande les parties de bord opposées (2, 4) de la bande s'étendant dans le sens de sa longueur et à ramener lesdites parties les unes vers les autres, afin d'obtenir un tube, dont la longueur est pourvue d'une fente définie par les parties de bord de la bande se dégageant verticalement du tube; (ii) introduction des éléments, ou de chaque élément (10), de fibre optique dans le tube; (iii) réalisation d'un joint entre les parties de bord verticales de la bande; (iv) pliage de ces parties verticales scellées par le joint contre le tube.
PCT/GB1995/002307 1994-09-28 1995-09-28 Procede d'introduction d'elements de fibre optique dans un tube WO1996010202A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU35720/95A AU3572095A (en) 1994-09-28 1995-09-28 Method of enclosing optical fibre element in a tube

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9419530.2 1994-09-28
GB9419530A GB9419530D0 (en) 1994-09-28 1994-09-28 Method of enclosing optical fibre element in a tube

Publications (1)

Publication Number Publication Date
WO1996010202A1 true WO1996010202A1 (fr) 1996-04-04

Family

ID=10762006

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/002307 WO1996010202A1 (fr) 1994-09-28 1995-09-28 Procede d'introduction d'elements de fibre optique dans un tube

Country Status (3)

Country Link
AU (1) AU3572095A (fr)
GB (1) GB9419530D0 (fr)
WO (1) WO1996010202A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170044020A (ko) * 2015-10-14 2017-04-24 헤라우스 일렉트로-나이트 인터내셔날 엔. 브이. 코어드 와이어, 그 제조 방법 및 장치
KR20170044044A (ko) * 2015-10-14 2017-04-24 헤라우스 일렉트로-나이트 인터내셔날 엔. 브이. 용융 강 배스의 온도 측정용 소모성 광섬유

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR640779A (fr) * 1927-09-12 1928-07-21 Trouvay & Cauvin Ets Perfectionnements apportés aux canalisations électriques à fils conducteurs isolés protégés par une enveloppe métallique
DE2045976A1 (de) * 1969-10-09 1971-04-15 Kabel Metallwerke Ghh Elektrisches Kabel mit einer die Kabelseele umschließenden metallischen Umhüllung
FR2468136A1 (fr) * 1979-10-19 1981-04-30 Int Standard Electric Corp Cable sous-marin a fibres optiques, methode de fabrication du cable et filiere d'etirage appropriee
US4372792A (en) * 1981-10-15 1983-02-08 Bicc Limited Manufacture of a flexible stranded optical fiber body
FR2552924A1 (fr) * 1983-09-30 1985-04-05 Lignes Telegraph Telephon Procede et dispositif de pose d'un revetement entourant un objet presentant un axe longitudinal, et cable obtenu par un tel procede

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR640779A (fr) * 1927-09-12 1928-07-21 Trouvay & Cauvin Ets Perfectionnements apportés aux canalisations électriques à fils conducteurs isolés protégés par une enveloppe métallique
DE2045976A1 (de) * 1969-10-09 1971-04-15 Kabel Metallwerke Ghh Elektrisches Kabel mit einer die Kabelseele umschließenden metallischen Umhüllung
FR2468136A1 (fr) * 1979-10-19 1981-04-30 Int Standard Electric Corp Cable sous-marin a fibres optiques, methode de fabrication du cable et filiere d'etirage appropriee
US4372792A (en) * 1981-10-15 1983-02-08 Bicc Limited Manufacture of a flexible stranded optical fiber body
FR2552924A1 (fr) * 1983-09-30 1985-04-05 Lignes Telegraph Telephon Procede et dispositif de pose d'un revetement entourant un objet presentant un axe longitudinal, et cable obtenu par un tel procede

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170044020A (ko) * 2015-10-14 2017-04-24 헤라우스 일렉트로-나이트 인터내셔날 엔. 브이. 코어드 와이어, 그 제조 방법 및 장치
KR20170044044A (ko) * 2015-10-14 2017-04-24 헤라우스 일렉트로-나이트 인터내셔날 엔. 브이. 용융 강 배스의 온도 측정용 소모성 광섬유
EP3156834A3 (fr) * 2015-10-14 2017-08-30 Heraeus Electro-Nite International N.V. Fil incorporé, procédé et dispositif de production
US10359589B2 (en) 2015-10-14 2019-07-23 Heraeus Electro-Nite International N.V. Cored wire, method and device for the production of the same
RU2712991C2 (ru) * 2015-10-14 2020-02-03 Хераеус Электро-Ните Интернациональ Н.В. Проволока с сердечником, способ и устройство для изготовления
KR102242434B1 (ko) * 2015-10-14 2021-04-20 헤라우스 일렉트로-나이트 인터내셔날 엔. 브이. 코어드 와이어, 그 제조 방법 및 장치
KR102242432B1 (ko) * 2015-10-14 2021-04-20 헤라우스 일렉트로-나이트 인터내셔날 엔. 브이. 용융 강 배스의 온도 측정용 소모성 광섬유
EP4242713A3 (fr) * 2015-10-14 2024-01-03 Heraeus Electro-Nite International N.V. Fil incorporé

Also Published As

Publication number Publication date
AU3572095A (en) 1996-04-19
GB9419530D0 (en) 1994-11-16

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