EP0138878A1 - Optical fibre - Google Patents

Optical fibre

Info

Publication number
EP0138878A1
EP0138878A1 EP84901121A EP84901121A EP0138878A1 EP 0138878 A1 EP0138878 A1 EP 0138878A1 EP 84901121 A EP84901121 A EP 84901121A EP 84901121 A EP84901121 A EP 84901121A EP 0138878 A1 EP0138878 A1 EP 0138878A1
Authority
EP
European Patent Office
Prior art keywords
refractive index
plastics
fibre
glass
cladding
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Withdrawn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
EP84901121A
Other languages
German (de)
English (en)
French (fr)
Inventor
Lubos Vacha
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of EP0138878A1 publication Critical patent/EP0138878A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/10—Coating
    • C03C25/104—Coating to obtain optical fibres
    • C03C25/105—Organic claddings
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C13/00—Fibre or filament compositions
    • C03C13/04—Fibre optics, e.g. core and clad fibre compositions
    • C03C13/045—Silica-containing oxide glass compositions
    • C03C13/046—Multicomponent glass compositions
    • 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
    • G02B6/02033—Core or cladding made from organic material, e.g. polymeric material

Definitions

  • the present invention relates to an optical fibre with a core of glass and a cladding of plastics.
  • the glass is often quartz glass with a low refractive index, while the cladding consists of high attenuation silicon rubber or other high- 5 attenuation, plastics. Due to the low refractive index of quartz glass, the numerical aperture of such fibres will be low while the high-attenuation plastics increases the attenuation in the fibre. Accordingly, these fibres are not suitable for transmitting large light powers over distances of medium length, e.g. some hundres of meters.
  • the object of the present invention is to provide an optical fibre with a high numerical aperture, the fibre thus being suitable for transmitting high light 15 powers over distances of medium length.
  • the optical fibre in accordance with the invention includes a core of glass and a cladding of plastics.
  • the glass is sodium borosilicate 20 glass with refractive index-raising oxides, while the plastics is an optically low-
  • the refractive index-raising oxides which are intended to give the glass a refractive index of at least 1,52 comprise combinations of PbO, BaO, CaO, MgO, Zr0 2 and ZnO, while the optically low-attenuation plastics, which should have a refractive index of 1,42 at most, comprises such as optically pure silicon rubber of the type supplied by the firm SHIN ETSU and which has a refractive index of 1,41 at 25°C.
  • a first glass core is produced having the following composition expressed in percent by weight:
  • the refractive index of this glass core was 1,52.
  • the fibre was given a numerical aperture of 0,57.
  • a second class core was produced with the following composition, also expressed in percent by weight:
  • the thickness of the silicon rubber cladding is preferably selected to be between 10 and 50 micrometers. To protect the cladding, this is coated with a protective coating of epoxyacrylate, for example.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Optics & Photonics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Glass Compositions (AREA)
  • Surface Treatment Of Glass Fibres Or Filaments (AREA)
EP84901121A 1983-03-14 1984-03-06 Optical fibre Withdrawn EP0138878A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8301379 1983-03-14
SE8301379A SE8301379L (sv) 1983-03-14 1983-03-14 Optisk fiber

Publications (1)

Publication Number Publication Date
EP0138878A1 true EP0138878A1 (en) 1985-05-02

Family

ID=20350356

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84901121A Withdrawn EP0138878A1 (en) 1983-03-14 1984-03-06 Optical fibre

Country Status (5)

Country Link
EP (1) EP0138878A1 ( )
JP (1) JPS60500784A ( )
IT (1) IT1173818B ( )
SE (1) SE8301379L ( )
WO (1) WO1984003776A1 ( )

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3132729B2 (ja) * 1990-02-23 2001-02-05 住友電気工業株式会社 広帯域高ｎａ光ファイバ

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0018110B1 (en) * 1979-04-04 1985-10-09 The Post Office Optical fibre core glass, optical fibres containing such glass and process for the manufacture of such glass
DE2929903A1 (de) * 1979-07-24 1981-02-19 Kabel Metallwerke Ghh Lichtwellenleiter und verfahren zu seiner herstellung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8403776A1 *

Also Published As

Publication number Publication date
SE8301379L (sv) 1984-09-15
SE8301379D0 (sv) 1983-03-14
WO1984003776A1 (en) 1984-09-27
IT8420012A0 (it) 1984-03-12
IT1173818B (it) 1987-06-24
JPS60500784A (ja) 1985-05-23

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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

17P Request for examination filed

Effective date: 19841015

AK Designated contracting states

Designated state(s): CH DE FR GB LI NL

17Q First examination report despatched

Effective date: 19860409

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

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19870317

RIN1 Information on inventor provided before grant (corrected)

Inventor name: VACHA, LUBOS