DE3938386A1 - Optical waveguide with low attenuation - provided by barrier layer between cladding tube and optically active region - Google Patents

Optical waveguide with low attenuation - provided by barrier layer between cladding tube and optically active region

Info

Publication number
DE3938386A1
DE3938386A1 DE19893938386 DE3938386A DE3938386A1 DE 3938386 A1 DE3938386 A1 DE 3938386A1 DE 19893938386 DE19893938386 DE 19893938386 DE 3938386 A DE3938386 A DE 3938386A DE 3938386 A1 DE3938386 A1 DE 3938386A1
Authority
DE
Germany
Prior art keywords
optical waveguide
area
cladding
cladding tube
waveguide according
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Withdrawn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
DE19893938386
Other languages
German (de)
Inventor
Ronald G Dr Sommer
Hans-Detlef Dr Leppert
Gerhard Dr Hahn
Frank Dr Lisse
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.)
Kabel Rheydt AG
Original Assignee
AEG Kabel AG
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 AEG Kabel AG filed Critical AEG Kabel AG
Priority to DE19893938386 priority Critical patent/DE3938386A1/en
Publication of DE3938386A1 publication Critical patent/DE3938386A1/en
Withdrawn legal-status Critical Current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
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • G02B6/03694—Multiple layers differing in properties other than the refractive index, e.g. attenuation, diffusion, stress properties
    • 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
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
    • G02B6/03622—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only
    • G02B6/03627—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only arranged - +
    • 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
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
    • G02B6/03638—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only

Abstract

In an optical waveguide with a cladding tube region (4), cladding layers (3) and a core (2), the novelty is that a barrier region (5) is provided to prevent transfer of the attenuation-increasing properties of the cladding tube region to the optically active region. Pref. the barrier region is a glass or doped SiO2 layer between the cladding tube region and the cladding layers. ADVANTAGE - The waveguide has extremely low attenuation.

Description

Lichwellenleiter bestehen bekanntlich aus einem Kern und einem Mantel. Die heiden Bereiche unterscheiden sich durch Material mit unterschiedlichem Brechungs­ index. Ein Lichtwellenleiter wird beispielsweise da­ durch hergestellt, daß die Innenwand eines Glasrohres (Mantelrohr) mit Mantelschichten und danach mit Kern­ glasschichten innenbeschichtet wird und das innenbe­ schichtete Glasrohr kollabiert und zu einer Glasfaser (Lichtwellenleiter) ausgezogen wird.As is known, optical waveguides consist of a core and a coat. Differentiate the heath areas different material with different refraction index. An optical fiber is there, for example made by that the inner wall of a glass tube (Jacket pipe) with jacket layers and then with core Glass layers are coated on the inside and the inside layered glass tube collapses and into a glass fiber (Optical fiber) is pulled out.

Der Erfindung liegt die Aufgabe zugrunde, einen Licht­ wellenleiter anzugeben, der eine möglichst geringe Lichtdämpfung aufweist. Diese Aufgabe wird durch einen Lichtwellenleiter mit den Merkmalen des Anspruchs 1 gelöst.The invention has for its object a light waveguide to specify the lowest possible Has light attenuation. This task is accomplished by one Optical waveguide with the features of claim 1 solved.

Die Erfindung wird im folgenden an einem Ausführungs­ beispiel erläutert.The invention is based on an embodiment example explained.

Die Fig. 1 zeigt den konstruktiven Aufbau eines Licht­ wellenleiters 1 nach der Erfindung. Der erfindungsge­ mäße Lichtwellenleiter 1 der Fig. 1 weist in der Mitte einen Kern 2 auf, der von Mantelschichten 3 um­ geben ist. Zwischen dem Mantelschichtbereich 3 und dem Mantelrohr 4 ist erfindungsgemäß ein Sperrberreich 5 vorgesehen, der die Dämpfung, die das den Lichtwellen­ leiter durchlaufende Licht erfährt, reduziert. Fig. 1 shows the construction of a light waveguide 1 according to the invention. The erfindungsge Permitted optical waveguide 1 of FIG. 1 has in the center on a core 2, which is passed from the cladding layers 3 in order. Between the cladding layer area 3 and the cladding tube 4 , a blocking area 5 is provided according to the invention, which reduces the attenuation experienced by the light passing through the optical waveguide.

Der Sperrbereich 5 besteht vorzugsweise aus Glas. Die Mantelschichten 3, die bei der Herstellung des Licht­ wellenleiters beispielsweise auf die Innenwand eines Mantelrohrs (4) aufgebracht werden, und vorzugsweise aus Glas bestehen, haben bekanntlich einen kleineren Brechungsindex als der Kern 2. Der nach der Erfindung vorgesehene Sperrbereich (5) hat einen Brechungsindex, der gleich dem Brechungsindex des Mantelrohrbe­ reichs (4) oder größer als der Brechungsindex des Mantelrohrbereichs (4) ist. Der Sperrbereich 5 weist vorzugsweise einen größeren Brechungsindex als die Mantelschichten (3) auf. Die Dicke des erfindungsge­ mäßen Sperrbereichs 5 liegt beispielsweise zwischen 2µ und 3µ.The blocking area 5 is preferably made of glass. The cladding layers 3 , which are applied, for example, to the inner wall of a cladding tube ( 4 ) during the manufacture of the light waveguide, and preferably consist of glass, are known to have a smaller refractive index than the core 2 . The blocking region ( 5 ) provided according to the invention has a refractive index which is equal to the refractive index of the jacket tube region ( 4 ) or greater than the refractive index of the jacket tube region ( 4 ). The blocking region 5 preferably has a larger refractive index than the cladding layers ( 3 ). The thickness of the blocking region 5 according to the invention is, for example, between 2µ and 3µ.

Der Sperrbereich 5 besteht beispielsweise aus dotiertem SiO2. Als Dotierstoff eignet sich beispielsweise eine phosphordotierung und/oder Fluordotierung und/oder Bor­ dotierung und/oder Germaniumdotierung.The blocking region 5 consists, for example, of doped SiO 2 . A suitable dopant is, for example, phosphorus doping and / or fluorine doping and / or boron doping and / or germanium doping.

Die Fig. 2 zeigt das Brechungsindexprofil eines Licht­ wellenleiters nach der Erfindung. Wie die Fig. 2 zeigt, hat der Sperrbereich 5 im Ausführungsbeispiel den gleichen Brechungsindex wie das Mantelrohr 4. Nach der Fig. 2 hat der aus einer Vielzahl von Mantel­ schichten bestehende Mantelschichtbereich 3 einen kleineren Brechungsindex als der daran angrenzenden Sperrbereich 5 und das Mantelrohr 4. Wie die Fig. 2 weiter zeigt, hat der Kern 2 einen größeren Brechungs­ index als die Mantelschichten (3), der Sperrbereich 5 und das Mantelrohr 4. Fig. 2 shows the refractive index profile of a light waveguide according to the invention. As shown in FIG. 2, the blocking region 5 in the exemplary embodiment has the same refractive index as the jacket tube 4 . According to FIG. 2, the cladding layer region 3 consisting of a plurality of cladding layers has a smaller refractive index than the adjacent blocking region 5 and the cladding tube 4 . As FIG. 2 further shows, the core 2 has a greater refractive index than the cladding layers (3), the locking portion 5 and the jacket tube 4.

Claims (8)

1. Lichtwellenleiter mit einem Mantelrohrbereich, mit Mantelschichten und mit einem Kern, dadurch gekenn­ zeichnet, daß ein Sperrbereich vorgesehen ist, der ver­ hindert, daß dämpfungserhöhende Eigenschaften vom Mantelrohrbereich auf den optisch aktiven Bereich über­ tragen werden.1. Optical waveguide with a cladding tube area, with cladding layers and with a core, characterized in that a blocking area is provided which prevents ver that attenuation-increasing properties are transferred from the cladding tube area to the optically active area. 2. Lichtwellenleiter nach Anspruch 1, dadurch gekenn­ zeichnet, daß der Sperrbereich zwischen dem Mantelrohr­ bereich und den Mantelschichten angeordnet ist.2. Optical waveguide according to claim 1, characterized records that the restricted area between the casing tube area and the cladding layers is arranged. 3. Lichtwellenleiter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Sperrbereich den Brechungsindex des Mantelrohrbereichs aufweist.3. Optical waveguide according to claim 1 or 2, characterized characterized in that the restricted area has the refractive index of the jacket tube area. 4. Lichtwellenleiter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Sperrbereich einen größeren Brechungsindex als der Mantelrohrbereich aufweist.4. Optical waveguide according to claim 1 or 2, characterized characterized in that the restricted area has a larger Refractive index than the cladding tube area. 5. Lichtwellenleiter nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Sperrbereich einen höheren Brechungsindex als die Mantelschichten auf­ weist.5. Optical waveguide according to one of claims 1 to 4, characterized in that the restricted area a higher refractive index than the cladding layers points. 6. Lichtwellenleiter nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Sperrbereich aus einem Glas besteht.6. Optical waveguide according to one of claims 1 to 5, characterized in that the restricted area from a Glass exists. 7. Lichtwellenleiter nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Sperrbereich aus do­ tiertem SiO2 besteht. 7. Optical waveguide according to one of claims 1 to 6, characterized in that the blocking area consists of do tiert SiO 2 . 8. Lichtwellenleiter nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß als Dotierstoff eine ph­ osphordotierung und/oder Fluordotierung und/oder Bordo­ tierung und/oder Germaniumdotierung vorgesehen ist.8. Optical waveguide according to one of claims 1 to 7, characterized in that a ph Osphoric doping and / or fluorine doping and / or Bordo tion and / or germanium doping is provided.
DE19893938386 1989-11-18 1989-11-18 Optical waveguide with low attenuation - provided by barrier layer between cladding tube and optically active region Withdrawn DE3938386A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19893938386 DE3938386A1 (en) 1989-11-18 1989-11-18 Optical waveguide with low attenuation - provided by barrier layer between cladding tube and optically active region

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19893938386 DE3938386A1 (en) 1989-11-18 1989-11-18 Optical waveguide with low attenuation - provided by barrier layer between cladding tube and optically active region

Publications (1)

Publication Number Publication Date
DE3938386A1 true DE3938386A1 (en) 1991-05-23

Family

ID=6393801

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19893938386 Withdrawn DE3938386A1 (en) 1989-11-18 1989-11-18 Optical waveguide with low attenuation - provided by barrier layer between cladding tube and optically active region

Country Status (1)

Country Link
DE (1) DE3938386A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4229070A (en) * 1978-07-31 1980-10-21 Corning Glass Works High bandwidth optical waveguide having B2 O3 free core and method of fabrication
US4230396A (en) * 1978-07-31 1980-10-28 Corning Glass Works High bandwidth optical waveguides and method of fabrication
DE3446664A1 (en) * 1984-01-10 1985-07-18 International Standard Electric Corp., New York, N.Y. LIGHT WAVE GUIDE WITH HYDROGEN BARRIER AND METHOD FOR THE PRODUCTION THEREOF
US4641917A (en) * 1985-02-08 1987-02-10 At&T Bell Laboratories Single mode optical fiber
DE3725252A1 (en) * 1986-10-06 1988-04-14 Jenaer Glaswerk Veb Preform for a multimode optical fibre
EP0154026B1 (en) * 1980-07-17 1988-09-07 BRITISH TELECOMMUNICATIONS public limited company A monomode optical fibre and a method of manufacture
EP0125828B1 (en) * 1983-05-02 1988-10-12 Sumitomo Electric Industries Limited Optical fiber and process for producing the same

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4229070A (en) * 1978-07-31 1980-10-21 Corning Glass Works High bandwidth optical waveguide having B2 O3 free core and method of fabrication
US4230396A (en) * 1978-07-31 1980-10-28 Corning Glass Works High bandwidth optical waveguides and method of fabrication
DE2930398C2 (en) * 1978-07-31 1991-10-17 Corning Glass Works, Corning, N.Y., Us
EP0154026B1 (en) * 1980-07-17 1988-09-07 BRITISH TELECOMMUNICATIONS public limited company A monomode optical fibre and a method of manufacture
EP0125828B1 (en) * 1983-05-02 1988-10-12 Sumitomo Electric Industries Limited Optical fiber and process for producing the same
DE3446664A1 (en) * 1984-01-10 1985-07-18 International Standard Electric Corp., New York, N.Y. LIGHT WAVE GUIDE WITH HYDROGEN BARRIER AND METHOD FOR THE PRODUCTION THEREOF
US4641917A (en) * 1985-02-08 1987-02-10 At&T Bell Laboratories Single mode optical fiber
DE3725252A1 (en) * 1986-10-06 1988-04-14 Jenaer Glaswerk Veb Preform for a multimode optical fibre

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Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8127 New person/name/address of the applicant

Owner name: KABEL RHEYDT AG, 4050 MOENCHENGLADBACH, DE

8139 Disposal/non-payment of the annual fee