EP0506566A1 - Procédé et dispositif de chauffage d'une fibre optique en silice sur une installation de fibrage - Google Patents

Procédé et dispositif de chauffage d'une fibre optique en silice sur une installation de fibrage Download PDF

Info

Publication number
EP0506566A1
EP0506566A1 EP92400835A EP92400835A EP0506566A1 EP 0506566 A1 EP0506566 A1 EP 0506566A1 EP 92400835 A EP92400835 A EP 92400835A EP 92400835 A EP92400835 A EP 92400835A EP 0506566 A1 EP0506566 A1 EP 0506566A1
Authority
EP
European Patent Office
Prior art keywords
propeller
fiber
axis
helix
heating
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.)
Withdrawn
Application number
EP92400835A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jean-Yves Boniort
Claude Brehm
Georges Roussy
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.)
Nexans France SAS
Alcatel Lucent NV
Original Assignee
Alcatel Fibres Optiques SA
Alcatel NV
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 Alcatel Fibres Optiques SA, Alcatel NV filed Critical Alcatel Fibres Optiques SA
Publication of EP0506566A1 publication Critical patent/EP0506566A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/78—Arrangements for continuous movement of material
    • H05B6/788—Arrangements for continuous movement of material wherein an elongated material is moved by applying a mechanical tension to it
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12444—Embodying fibers interengaged or between layers [e.g., paper, etc.]

Definitions

  • the present invention relates to a method and a device for heating an optical fiber made of silica on a fiberizing installation.
  • the fiber is found in hostile atmospheres: water vapor, water, corrosive liquids, for example oil and hydrogen.
  • such a coating can be produced by pyrolysis of a gaseous hydrocarbon circulating in a reactor placed in an oven heated to around 1000 ° C. by the Joule effect. The fiber then passes longitudinally through the reactor.
  • an essential condition for obtaining a good quality carbon deposit is that the silica fiber has a sufficiently high temperature when it enters the reactor, approximately 300 ° C. higher than the minimum pyrolysis temperature. .
  • This condition can possibly be achieved if the reactor is very close to the exit from the fiberizing furnace and if the fiber runs fast enough not to cool. This requires that the fiber drawing speed be greater than 150 meters per minute.
  • French patent FR-A-90 02 197 has already proposed to solve this problem a Joule effect oven; such an oven has drawbacks; it lacks efficiency because the silica fiber is transparent to infrared radiation and it would have to be very long to ensure sufficient heating.
  • the object of the present invention is to implement an efficient and space-saving method and device for heating the fiber, bringing the fiber to a temperature allowing the production of a good quality carbon deposition, whatever the fiber drawing speed; optimization of the carbon deposition and optimization of the optical characteristics of the fiber can therefore be ensured simultaneously.
  • the subject of the present invention is a method of heating an optical fiber made of silica on a fiberizing installation in order to bring it to a temperature above 1000 ° C. on its entry into a pyrolysis reactor where it must receive a carbon deposit, characterized in that said fiber is passed through substantially in the axis of a microwave resonant cavity formed of a metal wire wound in a helix and fixed at its two ends respectively to two plates metallic.
  • the present invention also relates to a device for heating an optical fiber made of silica on a fiberizing installation, intended to be arranged at the outlet of the fiberizing oven to bring said fiber to a temperature above 1000 ° C., characterized by the fact that it comprises a microwave generator associated by means of coupling to a resonant cavity formed of a metallic wire wound in a helix, fixed at its two ends respectively to two metallic plates known as of short-circuit, said fiber being susceptible to pass substantially along the axis of said propeller.
  • said device comprises a coaxial guide, terminated by a dipole antenna associated by said coupling means with said propeller, the dipole being parallel to the axis of this propeller.
  • Means for adjusting the coupling can be provided and in particular means for adjusting the distance of the dipole of said antenna from the axis of said propeller.
  • said device comprises a single-mode waveguide of rectangular section.
  • the small edge of said section should be oriented parallel to the axis of the propeller.
  • the directions of the maximum electric field in the propeller and the waveguide are parallel to each other, and the coupling is maximum.
  • the device according to the invention can comprise means for adjusting the pitch and the diameter of said propeller, and thus adjusting the resonance frequency of said cavity; these adjustment means may be means for moving in rotation or in translation at least one of said metal short-circuit plates.
  • the field confined inside the propeller makes it possible to 'raise this temperature, over a distance of the order of ten centimeters, to a temperature of 1400 ° C, for a speed of 150 meters per minute.
  • the power is around 500 watts, at the frequency of 2.45 GHz.
  • the resonant frequency of the propeller does not each with the dielectric characteristics of the material it contains, unlike other types of cavity. This is fundamental for the application concerned by the present invention, since the dielectric characteristics of the fiber vary between 900 ° C and 1400 ° C. It is therefore sufficient to carry out the resonance adjustment of the cavity according to the invention once and for all; the increase in the temperature of the fiber in the cavity does not modify the resonant frequency or the efficiency of the heating. No readjustment is necessary and, at the inlet of the pyrolysis reactor, the optical fiber has the temperature required to receive a hermetic carbon coating.
  • FIG. 1 a fiberizing furnace 1 with a preform 2.
  • the fiberizing speed is 150 meters per minute.
  • the fiber 10 which leaves the furnace 1 passes through a device 3 for measuring the diameter; it is then at a temperature close to 900 ° C; it is introduced into a cavity 4 according to the invention associated with a microwave generator 5 at 2.45 GHz.
  • the cavity 4 will be described later.
  • the fiber 10 which is at a temperature of the order of 1400 ° C. passes directly into an oven of pyrolysis 6 where is introduced through a pipe 7 at least one gas chosen for example from saturated hydrocarbons, such as methane, ethane, propane, butane, and unsaturated hydrocarbons such as acetylene, ethylene , propylene, butadiene and their mixtures, as well as among halogenated hydrocarbons, such as dichloromethane.
  • saturated hydrocarbons such as methane, ethane, propane, butane
  • unsaturated hydrocarbons such as acetylene, ethylene , propylene, butadiene and their mixtures
  • halogenated hydrocarbons such as dichloromethane.
  • the fiber 11 provided with its carbon deposit then passes through cladding dies 14 and boxes 13 of UV irradiation.
  • the finished sheathed fiber referenced 12 passes over a capstan 15 and is stored on a winder 16.
  • the cavity 4 is shown diagrammatically in FIG. 2. It essentially comprises a propeller 20 of axis 21 and of length 100 mm, made up of a metallic wire of 0.5mm in diameter.
  • the propeller itself has an inside diameter of 3mm and a pitch of about 2 to 3mm.
  • the metal constituting the propeller 20 has good mechanical temperature resistance; you can choose rhodium platinum or a refractory alloy such as "Kanthal”.
  • the propeller 20 is fixed at its ends 23, 24 respectively to two metal short-circuit plates 25, 26.
  • the propeller is enclosed in a metallic cylinder 27 which constitutes the shielding of the cavity 4 and reduces any external disturbance.
  • Adjustments in translation and in rotation of the plate 25, shown diagrammatically by the arrows 30 and 31, are provided for modifying the pitch and the diameter of the propeller 20.
  • the microwave energy delivered by the generator 5 at 2.45 GHz is introduced into the cavity 4 using a coaxial guide 40 ending in a dipole antenna 41, the dipole of which is parallel to the axis 21 .
  • the antenna-helix coupling must be particularly careful to ensure a good transfer of energy.
  • the two parameters which make it possible to adjust the coupling are the length 1 of the dipole and its distance d relative to the axis 21.
  • the diameter of the propeller and its pitch are adjusted so that the resonance frequency of the cavity is 2.45 GHz.
  • the coaxial guide 40 is replaced by a single mode waveguide of rectangular section 43 x 86 mm.
  • the waveguide is oriented in such a way that the 43 mm edge is parallel to the axis 21. The coupling is thus maximum.
  • a current can be passed through the propeller 20, for example 10A at 24 volts, to reduce the cooling of the fiber 10 by its environment.
  • the short-circuit plates 25, 26 are modified accordingly to allow an electrical supply isolated from the propeller 20.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Surface Treatment Of Glass Fibres Or Filaments (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
EP92400835A 1991-03-29 1992-03-26 Procédé et dispositif de chauffage d'une fibre optique en silice sur une installation de fibrage Withdrawn EP0506566A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9103879 1991-03-29
FR9103879A FR2674721B1 (fr) 1991-03-29 1991-03-29 Dispositif de chauffage d'une fibre optique en silice sur une installation de fibrage.

Publications (1)

Publication Number Publication Date
EP0506566A1 true EP0506566A1 (fr) 1992-09-30

Family

ID=9411300

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92400835A Withdrawn EP0506566A1 (fr) 1991-03-29 1992-03-26 Procédé et dispositif de chauffage d'une fibre optique en silice sur une installation de fibrage

Country Status (6)

Country Link
US (1) US5247147A (ja)
EP (1) EP0506566A1 (ja)
JP (1) JPH0585779A (ja)
CA (1) CA2064359A1 (ja)
FI (1) FI921372A (ja)
FR (1) FR2674721B1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018133936A1 (de) * 2017-01-19 2018-07-26 Leoni Kabel Gmbh Mikrowellensystem und absorberanordnung zur mikrowellenvernetzung von silikonleitungen

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6436484B1 (en) * 1997-12-09 2002-08-20 Coats American, Inc. Processes for coating sewing thread
US20010035029A1 (en) * 1999-07-12 2001-11-01 Akira Ikushima Method of manufacturing an optical fiber
US6758609B2 (en) * 2002-06-11 2004-07-06 Lambda Technologies Methods and apparatus of joining optically coupled optoelectronic and fiber optic components using electromagnetic radiation

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB554749A (en) * 1942-04-18 1943-07-16 British Insulated Cables Ltd Improvements relating to the heat treatment of the insulating coverings of electric wires and cables and other materials
GB616996A (en) * 1946-09-30 1949-01-31 Standard Telephones Cables Ltd Improvements in or relating to high frequency dielectric heating
GB1065971A (en) * 1964-03-07 1967-04-19 Elliott Electronic Tubes Ltd Extruded material heater and heating process
BE696417A (ja) * 1966-03-31 1967-09-01
CH492377A (fr) * 1967-04-18 1970-06-15 Commissariat Energie Atomique Dispositif de chauffage par pertes diélectriques en haute fréquence
FR2318555A1 (fr) * 1975-07-16 1977-02-11 Lignes Telegraph Telephon Perfectionnements aux fours hyperfrequence notamment utilisables au chauffage de tiges de verre et de fibres optiques
GB2053629A (en) * 1979-06-07 1981-02-04 Anvar Process and Device for the Heat Treatment of Filiform Elements

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB619996A (en) * 1943-08-25 1949-03-17 Philips Nv Improvements in or relating to coils for electric circuits
US4694586A (en) * 1985-05-17 1987-09-22 David Reznik Apparatus and method for drying and curing coated substrates
FR2623508B1 (fr) * 1987-11-20 1990-04-20 Commissariat Energie Atomique Proteine basique denommee phospholipase a2 isolee de venin de serpent de la famille des elapides et sa sequence en amino-acides, derives et fragments de ladite proteine, leur procede d'obtention, compositions therapeutiques et agents de diagnostic contenant ladite proteine et/ou ses derives et/ou ses fragments
US4863760A (en) * 1987-12-04 1989-09-05 Hewlett-Packard Company High speed chemical vapor deposition process utilizing a reactor having a fiber coating liquid seal and a gas sea;
AU624203B2 (en) * 1988-12-21 1992-06-04 Sumitomo Electric Industries, Ltd. Method and apparatus for producing coated optical fiber
GB8912470D0 (en) * 1989-05-31 1989-07-19 Stc Plc Carbon coating of optical fibres
US5021072A (en) * 1990-01-16 1991-06-04 At&T Bell Laboratories Method for making a carbon-coated and polymer-coated optical fiber
US5114738A (en) * 1990-07-20 1992-05-19 The United States Of America As Represented By The Secretary Of The Army Direct optical fiber glass formation techniques using chemically and/or physically removable filamentary substrates

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB554749A (en) * 1942-04-18 1943-07-16 British Insulated Cables Ltd Improvements relating to the heat treatment of the insulating coverings of electric wires and cables and other materials
GB616996A (en) * 1946-09-30 1949-01-31 Standard Telephones Cables Ltd Improvements in or relating to high frequency dielectric heating
GB1065971A (en) * 1964-03-07 1967-04-19 Elliott Electronic Tubes Ltd Extruded material heater and heating process
BE696417A (ja) * 1966-03-31 1967-09-01
CH492377A (fr) * 1967-04-18 1970-06-15 Commissariat Energie Atomique Dispositif de chauffage par pertes diélectriques en haute fréquence
FR2318555A1 (fr) * 1975-07-16 1977-02-11 Lignes Telegraph Telephon Perfectionnements aux fours hyperfrequence notamment utilisables au chauffage de tiges de verre et de fibres optiques
GB2053629A (en) * 1979-06-07 1981-02-04 Anvar Process and Device for the Heat Treatment of Filiform Elements

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018133936A1 (de) * 2017-01-19 2018-07-26 Leoni Kabel Gmbh Mikrowellensystem und absorberanordnung zur mikrowellenvernetzung von silikonleitungen

Also Published As

Publication number Publication date
JPH0585779A (ja) 1993-04-06
FR2674721B1 (fr) 1993-06-04
FR2674721A1 (fr) 1992-10-02
FI921372A (fi) 1992-09-30
FI921372A0 (fi) 1992-03-27
US5247147A (en) 1993-09-21
CA2064359A1 (fr) 1992-09-30

Similar Documents

Publication Publication Date Title
Alexander Schmidt et al. Hybrid optical fibers–an innovative platform for in‐fiber photonic devices
EP0112224B1 (fr) Dispositif d'échauffement d'une zone annulaire superficielle d'un objet filiforme
EP0061378B1 (fr) Procédé de modification contrôlée des caractéristiques géométriques de l'extrémité d'une fibre optique monomode, et application au couplage optique
WO2005049513A2 (en) Optoelectronic fiber codrawn from conducting, semiconducting, and insulating materials
Gerislioglu et al. Single-and multimode beam propagation through an optothermally controllable Fano clusters-mediated waveguide
EP0803478B1 (fr) Dispositif de fibrage d'une préforme de fibre optique
EP0696750B1 (fr) Procédé de fabrication d'un câble à fibres optiques renforcé; dispositif pour la mise en oeuvre de ce procédé et câble obtenu par ce procédé
US20150125122A1 (en) Graphene coated fiber optics
Tang et al. Elliptical metallic hollow fiber inner-coated with non-uniform dielectric layer
CH617556A5 (ja)
EP0506566A1 (fr) Procédé et dispositif de chauffage d'une fibre optique en silice sur une installation de fibrage
NL1033783C2 (nl) Inrichting voor het uitvoeren van een plasma chemische dampdepositie alsmede werkwijze ter vervaardiging van een optische voorvorm.
FR2792733A1 (fr) Preforme comprenant un revetement barriere contre la diffusion d'hydrogene dans la fibre optique fabriquee a partir de cette preforme et procede de preparation d'une telle preforme
FR2661486A1 (fr) Procede et four de chauffage avec levitation.
FR2483970A2 (fr) Procede et dispositif pour le traitement thermique d'elements filiformes
EP0509855B1 (fr) Installation et procédé de traitement thermique par ondes hyperfréquences de compositions céramiques
WO2003093884A2 (en) A method and apparatus relating to optical fibres
EP0443480B1 (fr) Procédé et dispositif pour déposer une couche de carbone sur une fibre de verre, et fibre optique en faisant application
FR2674526A1 (fr) Dispositif a source de rayonnement ultraviolet induit par des micro-ondes, pour la polymerisation d'objets photopolymerisables.
CN111796365B (zh) 基于涂敷黑磷微纳光纤卷型谐振器的光调制器
Croitoru et al. Infrared chalcogenide tube waveguides
FR2587502A1 (fr) Appareil permettant de realiser la fusion et l'etirage de fibres optiques, notamment pour la fabrication de coupleurs
Biryukov et al. Energy transfer in optical fibres
FR2584101A1 (fr) Dispositif pour fabriquer un composant optique a gradient d'indice de refraction
EP1112975A1 (fr) Procédé et dispositif de fabrication de préformes destinées à la réalisation de fibres optiques

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

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT NL SE

17P Request for examination filed

Effective date: 19930205

17Q First examination report despatched

Effective date: 19931220

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19940701