EP1110109A1 - Fibre optique en matiere plastique - Google Patents

Fibre optique en matiere plastique

Info

Publication number
EP1110109A1
EP1110109A1 EP99944383A EP99944383A EP1110109A1 EP 1110109 A1 EP1110109 A1 EP 1110109A1 EP 99944383 A EP99944383 A EP 99944383A EP 99944383 A EP99944383 A EP 99944383A EP 1110109 A1 EP1110109 A1 EP 1110109A1
Authority
EP
European Patent Office
Prior art keywords
light
optical fiber
absorbing layer
fiber according
vaporization
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Withdrawn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
EP99944383A
Other languages
German (de)
English (en)
Inventor
Wolfgang Dultz
Walter Heitmann
Erich Becker
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.)
3M Deutschland GmbH
Original Assignee
Quante GmbH
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
Priority claimed from DE19849383A external-priority patent/DE19849383A1/de
Application filed by Quante GmbH filed Critical Quante GmbH
Publication of EP1110109A1 publication Critical patent/EP1110109A1/fr
Withdrawn legal-status Critical Current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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02033—Core or cladding made from organic material, e.g. polymeric material

Definitions

  • the invention relates to an optical fiber made of plastic.
  • Optical fibers made of plastic represent a transmission medium for light waves that is well suited for wide use in the context of communications technology.
  • plastic mainly polymerized plastics such as polymethyl methacrylate (PMMA) or polystyrene (PS) are used as core material.
  • PMMA polymethyl methacrylate
  • PS polystyrene
  • Fluorinated polymers, silicones or PMMA are used as coating substances.
  • plastic optical fibers can be made with large diameters.
  • Plastic fibers have high numerical apertures. They have good breaking strength and are easy to handle. Furthermore, they enable simple connection and connection technology, since they have low precision requirements.
  • the core diameter of a POF almost corresponds to the outside diameter, while for conventional glass fibers it is in the range of the wavelength of the light to be transmitted.
  • Typical diameters of the POF are according to H.Hultzsch: "Optical Telecommunications Systems", Damm-Verlag, Gelsenmaschinen, in the order of 1 mm.
  • plastic fibers run a large number of so-called modes, which are bundles of light that pass through the waveguide at different angles. As the angle increases, the ordinal number of modes increases, the light path in the waveguide lengthens, the number of reflections in the border area between the core and the cladding increases, and the depth of penetration of the light in the cladding increases. Messages are transmitted in the form of light pulses in such light guides. Due to the runtime differences between the modes, the light pulses are greatly broadened (mode dispersion).
  • step mdex fibers are available, which in the best case allow a bandwidth of 170 MHz with a total length of 100 m. However, these values are too low for future broadband networks.
  • the object of the present invention is to provide an optical fiber made of plastic which is comparatively simple and inexpensive to manufacture and which is smaller
  • the core of the fiber made of low-vaporization light-conducting plastic is surrounded by an inner, low-vaporization layer with a lower refractive index and by an outer, strong light-absorbing layer.
  • the present invention describes a new type of step index plastic fiber that can be made by known means. It is preferably provided that the thickness of the low-vaporization layer is between 0.3 ⁇ m and 3 ⁇ m.
  • the core of the fiber made of low-vaporization, light-conducting plastic is surrounded by a light-absorbing layer. In cases where the fiber meets the optical requirements, the intermediate layer can thus be omitted.
  • the fiber is irradiated with a narrow cone of light m, so that only part of the aperture is filled, part of the light output is converted to curvatures or to higher-order modes by nuclear homogeneity. These, in turn, are absorbed by the jacket due to their greater depth of penetration and the higher number of reflections.
  • the light beam remains almost unchanged in the result; it still consists of modes that are mainly close to the axis and has a low mode dispersion. The losses due to the absorption of the high modes are low, since the conversion in higher modes remains limited.
  • the feeding of the fiber according to the invention can also be used with gradient fibers in order to reduce higher-order modes produced by inaccuracies caused by production technology, and to reduce additional dispersion as a result.
  • the thickness of the light-absorbing layer is greater than 1 ⁇ m. It is advantageous if the light-absorbing layer has an attenuation between 10 4 dB / km and 10 7 dB / km.
  • the high vaporization of the light-absorbing layer is achieved by adding small amounts of cobalt, chromium, manganese or iron in a plastic matrix. Doping with rare earth oxides or other substances which have a high absorption in the range of the wavelength of the light to be transmitted are also possible. An addition of 2 ppm cobalt ions leads to a vaporization of 10000 dB / km at a wavelength of the light to be transmitted of 650 nm.
  • Devices are modified in such a way that the substances provided for producing the fiber core and the layers are extruded around one another in an extrusion device by three concentrically arranged spinnerets.
  • Preforms are bars with a typical diameter of a few centimeters and a length m of the order of Im.
  • the end of the preform is heated to pull out the fiber.
  • a plastic rod made of the material provided for the production of the fiber core is surrounded by a sleeve made of the material provided for the production of the light-absorbing layer, the space between the rod and the sleeve containing the the production of the low-vapor layer material provided is filled and that a fiber is drawn from the blank thus obtained.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Multicomponent Fibers (AREA)

Abstract

L'invention concerne une fibre optique en matière plastique dont le coeur est constitué d'une matière plastique photoconductrice à faible atténuation et entouré d'une couche à faible atténuation d'un indice de diffraction plus petit et d'une couche extérieure absorbant plus fortement la lumière. Selon l'invention, le coeur de la fibre, qui est constitué d'une matière plastique photoconductrice à faible atténuation, peut aussi être entouré d'une couche absorbant la lumière.
EP99944383A 1998-08-25 1999-08-12 Fibre optique en matiere plastique Withdrawn EP1110109A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19838499 1998-08-25
DE19838499 1998-08-25
DE19849383 1998-10-27
DE19849383A DE19849383A1 (de) 1998-08-25 1998-10-27 Lichtleitfaser aus Kunststoff
PCT/EP1999/005920 WO2000011497A1 (fr) 1998-08-25 1999-08-12 Fibre optique en matiere plastique

Publications (1)

Publication Number Publication Date
EP1110109A1 true EP1110109A1 (fr) 2001-06-27

Family

ID=26048366

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99944383A Withdrawn EP1110109A1 (fr) 1998-08-25 1999-08-12 Fibre optique en matiere plastique

Country Status (5)

Country Link
US (1) US6501894B2 (fr)
EP (1) EP1110109A1 (fr)
JP (1) JP2002523794A (fr)
CA (1) CA2341670A1 (fr)
WO (1) WO2000011497A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7239785B2 (en) * 2004-12-30 2007-07-03 Corning Incorporated Method of preventing optical fiber failure in high power application
JP6532748B2 (ja) * 2015-04-30 2019-06-19 株式会社フジクラ マルチコアファイバ
DE102015209123A1 (de) * 2015-05-19 2016-11-24 Robert Bosch Gmbh Recheneinrichtung und Betriebsverfahren hierfür

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4161500A (en) * 1977-10-14 1979-07-17 E. I. Du Pont De Nemours And Company Process for low attenuation methacrylate optical fiber
JPS56101108A (en) * 1980-01-17 1981-08-13 Fujitsu Ltd Glass fiber for light transmission
JPS59154407A (ja) * 1983-02-22 1984-09-03 Sumitomo Electric Ind Ltd イメ−ジフアイバ
US4877306A (en) 1987-09-30 1989-10-31 Corning Glass Works Coated optical waveguide fibers
JPH0778564B2 (ja) * 1988-03-09 1995-08-23 日立電線株式会社 プラスチック光ファイバの製造方法
CA2056469C (fr) * 1990-11-30 1997-03-25 Hiroaki Oonishi Fibres optiques en plastique
US5319731A (en) * 1992-10-02 1994-06-07 Eastman Kodak Company Fiber-optic array of limited acceptance angle
JPH07113920A (ja) * 1993-10-19 1995-05-02 Olympus Optical Co Ltd イメージファイバー
US5841926A (en) 1996-01-04 1998-11-24 Nippon Telegraph And Telephone Corporation Optical fibers for optical attenuation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0011497A1 *

Also Published As

Publication number Publication date
JP2002523794A (ja) 2002-07-30
US20010024558A1 (en) 2001-09-27
US6501894B2 (en) 2002-12-31
WO2000011497A1 (fr) 2000-03-02
CA2341670A1 (fr) 2000-03-02

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