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EP0169237A1 - Epissage de fibres de verre par fusion a la flamme - Google Patents

Epissage de fibres de verre par fusion a la flamme

Info

Publication number
EP0169237A1
EP0169237A1 EP19850900883 EP85900883A EP0169237A1 EP 0169237 A1 EP0169237 A1 EP 0169237A1 EP 19850900883 EP19850900883 EP 19850900883 EP 85900883 A EP85900883 A EP 85900883A EP 0169237 A1 EP0169237 A1 EP 0169237A1
Authority
EP
European Patent Office
Prior art keywords
flow
fiber
flow portion
velocity
chlorine
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP19850900883
Other languages
German (de)
English (en)
Inventor
John Thorvald Krause
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
American Telephone and Telegraph Co Inc
AT&T Corp
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 American Telephone and Telegraph Co Inc, AT&T Corp filed Critical American Telephone and Telegraph Co Inc
Publication of EP0169237A1 publication Critical patent/EP0169237A1/fr
Pending legal-status Critical Current

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
    • G02B6/24—Coupling light guides
    • G02B6/255—Splicing of light guides, e.g. by fusion or bonding
    • G02B6/2551—Splicing of light guides, e.g. by fusion or bonding using thermal methods, e.g. fusion welding by arc discharge, laser beam, plasma torch

Definitions

  • the invention is concerned with connecting glass fibers and, more particularly, with producing high-strength splice connections of lightguide glass fibers by heat fusion.
  • Lightwave communications via lightguide glass fibers is widely considered as virtually certain to replace most of current electrical communications over copper wire, and the manufacture of optical fibers has reached a high level of perfection. Fabrication aspects such as the making of preforms, the drawing of fibers, their coating and sheathing, and their interconnection are highly advanced.
  • the invention is a method for splicing glass fibers by heat fusion.
  • the method involves the use of a tri-partite flow of gases, namely, an outer, relatively high-velocity oxygen flow, an intermediate, lower-velocity chlorine or oxygen flow, and a central flow of H2, D2, H3 or ND3.
  • Resulting spliced fibers have a yield strength which is at least 60 percent of pristine strength.
  • the Figure is a schematic cross-sectional view of a triple-orifice nozzle of a torch as may be conveniently used to practice the invention. Detailed Description
  • the Figure shows central orifice 1 , intermediate orifice 3, and outer orifice 5 of a triple nozzle having coaxial cylindrical nozzles 2, 4, and 6.
  • Each of the orifices 1, 3, and 5 can be connected to a gas supply to produce a corresponding flow out of each respective orifice.
  • the outer diameter of the outermost nozzle 6 is typically of the order of 0.5 centimeter.
  • the invention is aimed at producing high-strengt splice connections between glass fibers, as are being used, e.g., in optical communications.
  • Such fibers have a surface glass portion which preferably comprises at least 95 weight percent silica, and their diameter is of the order of 100 micrometers.
  • Optical fibers typically comprise a core portion having a refractive index which is slightly greater than the refractive index of a surrounding claddi-ng portion; in the case of fibers for th transmission of a single optical mode the diameter of the core portion may be of the order of 10 micrometers. Raise refractive index of a core portion is conveniently achieve by doping such as, e.g., by the addition of germanium to silica.
  • Processing in accordance with the invention call for bringing essentially coaxially aligned glass fibers into end-to-end contact and heating in a flame which is produced upon combustion in a flow of gases.
  • This flow preferably comprises three portions as produced, e.g., by nozzle as shown in the Figure and as may be designated outer, intermediate, and central portions.
  • the outer flow portion preferably is at least 50 volume percent oxygen
  • the intermediate flow portion is preferably at least 50 volume percent chlorine, oxygen, or a mixture of chlorine and oxygen
  • the central flow portion is preferably at least 50 volume percent hydrogen, ammonia, deuterium, deuterated ammonia, or a mixture thereof.
  • a splice connection is produced in accordance with the invention by heating in a flame produced upon combustion in a flow having portions as described above.
  • the temperature of fiber ends being joined preferably does not exceed 1800 degrees C or, more favorably, does not exceed 1700 degrees C.
  • Temperature control is most readil achieved by regulating flow through the central orifice. Fusion time depends indirectly on fusion temperature and directly on fiber diameter; fusion times in the range of from 15 seconds to 2 minutes are typical.
  • Splice connections made in accordance with the invention produce a spliced fiber having a preferred tensile strength which is greater than or equal to 60 percent of pristine fiber strength (the tensile strengt of fibers or the lesser of the tensile strengths of fibers being joined).
  • Particularly high strengths of at least 95 percent of pristine strength are achieved when the inne flow is essentially hydrogen or. deuterium and the intermediate flow is essentially chlorine and if care is taken to prevent excessive heating of fiber ends prior to their being inside of the chlorine flow. This is conveniently achieved by initially keeping central hydroge flow at a low rate so that a preferred temperature of 500 degrees C is not exceeded until after fiber ends are within the chlorine flow.
  • resulting fiber strengths are greater than or equal to 800 kpsi.
  • Example. Two essentially identical single-mode optical fibers were spliced by heat fusing in accordance with the invention. The fibers had Ge-doped cores having a diamete of approximately 10 micrometers and essentially pure silic claddings. Overall fiber diameter was 125 micrometers. The ends of the fibers were placed end-to-end and exposed to a flame produced by a torch having three concentric orifices.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Coupling Of Light Guides (AREA)

Abstract

Dans le but d'obtenir des connexions d'épissure de haute résistance entre des fibres de verre à base de silice, un procédé d'utilisation d'un écoulement tripartite de gaz pour une fusion à la flamme est décrit. Un écoulement d'oxygène externe de vitesse relativement élevée (5) entoure un écoulement de chlore ou d'oxygène intermédiaire de vitesse plus lente (3) qui à son tour entoure un écoulement central de H2, D2, NH3, ou ND3 (1). En particulier, des résistances élevées sont obtenues lorsqu'un écoulement central d'hydrogène ou de deutérium et un écoulement intermédiaire de chlore sont utilisés de sorte que les extrémités des fibres à épisser sont chauffées à des températures de 500oC et au delà uniquement après avoir enveloppé ces extrémités par du chlore.
EP19850900883 1984-01-24 1985-01-15 Epissage de fibres de verre par fusion a la flamme Pending EP0169237A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US57314184A 1984-01-24 1984-01-24
US573141 1984-01-24

Publications (1)

Publication Number Publication Date
EP0169237A1 true EP0169237A1 (fr) 1986-01-29

Family

ID=24290816

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19850900883 Pending EP0169237A1 (fr) 1984-01-24 1985-01-15 Epissage de fibres de verre par fusion a la flamme
EP19850300257 Expired EP0150095B1 (fr) 1984-01-24 1985-01-15 Raccord de fibres de verre par fusion à la flamme

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP19850300257 Expired EP0150095B1 (fr) 1984-01-24 1985-01-15 Raccord de fibres de verre par fusion à la flamme

Country Status (4)

Country Link
EP (2) EP0169237A1 (fr)
JP (1) JPS61501172A (fr)
DE (1) DE3562136D1 (fr)
WO (1) WO1985003283A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4689065A (en) * 1986-02-14 1987-08-25 American Telephone And Telegraph Company, At&T Bell Laboratories Optical waveguide glass fiber flame processing
US6899470B2 (en) 2002-07-17 2005-05-31 Fitel Usa Corp. Systems and methods for fabricating low-loss, high-strength optical fiber transmission lines
CN114590991A (zh) * 2022-01-25 2022-06-07 南京庆科电子技术有限公司 一种玻璃密封连接器熔融密封工艺及装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH638622A5 (fr) * 1979-09-14 1983-09-30 Cabloptic Sa Procede et dispositif de soudage des fibres optiques.
JPS58120215A (ja) * 1982-01-13 1983-07-18 Kokusai Denshin Denwa Co Ltd <Kdd> 光フアイバの接続方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8503283A1 *

Also Published As

Publication number Publication date
EP0150095B1 (fr) 1988-04-13
JPS61501172A (ja) 1986-06-12
WO1985003283A1 (fr) 1985-08-01
EP0150095A3 (en) 1985-08-21
EP0150095A2 (fr) 1985-07-31
DE3562136D1 (en) 1988-05-19

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

AK Designated contracting states

Designated state(s): DE FR GB NL

17P Request for examination filed

Effective date: 19860107

XX Miscellaneous

Free format text: VERFAHREN ABGESCHLOSSEN INFOLGE VERBINDUNG MIT 85300257.4/0150095 (EUROPAEISCHE ANMELDENUMMER/VEROEFFENTLICHUNGSNUMMER) VOM 25.08.86.

RIN1 Information on inventor provided before grant (corrected)

Inventor name: KRAUSE, JOHN, THORVALD