WO1984003776A1 - Optical fibre - Google Patents
Optical fibre Download PDFInfo
- Publication number
- WO1984003776A1 WO1984003776A1 PCT/SE1984/000078 SE8400078W WO8403776A1 WO 1984003776 A1 WO1984003776 A1 WO 1984003776A1 SE 8400078 W SE8400078 W SE 8400078W WO 8403776 A1 WO8403776 A1 WO 8403776A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- plastics
- fibre
- glass
- refractive index
- cladding
- Prior art date
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)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Optics & Photonics (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Glass Compositions (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
Abstract
An optical fibre with a core of glass and a cladding of plastics. In accordance with the invention, the glass is a sodium borosilicate glass containing refractive index-raising oxides, while the plastics is an optically low-attenuation plastics with a low refrective index, whereby a high numerical aperture is obtained in the optical fibre.
Description
OPTICAL FIBRE
TECHNICAL FIELD
,*.
The present invention relates to an optical fibre with a core of glass and a cladding of plastics.
BACKGROUND ART
In known such fibres 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.
10 A method of transmitting high light power with the aid of such fibres would be to increase their diameter. However, this results in the fibres being more expensive while they will be less flexible at the same time.
DISCLOSURE OF INVENTION
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.
This is provided by the fibre in accordance with the invention being given the characterizing features disclosed in the claims.
BEST MODE FOR CARRYING OUT THE INVENTION
The optical fibre in accordance with the invention includes a core of glass and a cladding of plastics. According to the invention, the glass is sodium borosilicate 20 glass with refractive index-raising oxides, while the plastics is an optically low-
OMFI
attenuation plastics with a low refractive index.
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, Zr02 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:
NazO 17,2
15,0
B2°3
MgO 1,2
ZnO 3,1
A1203 3,1
Zr02 6,6
As 0, 0,1
The refractive index of this glass core was 1,52. With a sheath of plastics according to the above, 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:
SiOz 51,4
Na20 18,3
14,9
B2°3 BaO 9,2
Zr02 6,1
As90, 0,1
The refractive index of this glass core attained 1,55. With a cladding of plastics in accordance with the above this other fibre was given a numerical aperture of 0.64.
,
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.
l
Claims
1 Optical fibre with a core of glass and a cladding of plastics, characterized in that for obtaining a high numerical aperture the glass is a sodium borosilicate glass with oxides for increasing its refractive index, while the plastics is an optically low-attenuation plastics with a low refractive index.
2 Fibre as claimed in claim 1, characterized in that the oxides comprise combinations of PbO, BaO, CaO, MgO, Zro„ and ZnO, while the plastics comprises optically pure silicon rubber.
3 Fibre as claimed in claim 1 or 2, characterized in that the refractive index of the glass core attains at least 1,52, while the refractive index of the plastics cladding is at most 1,42.
4 Fibre as claimed in any of claims 1-3, characterized in that the thickness of the plastics sheath attains to between 10 and 50 micrometers.
5 Fibre as claimed in claim 2, characterized in that the cladding is given a protective coating.
6 Fibre as claimed in claim 5, characterized in that the protective coating consists of epoxyacrylate.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8301379A SE8301379L (en) | 1983-03-14 | 1983-03-14 | OPTICAL FIBER |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1984003776A1 true WO1984003776A1 (en) | 1984-09-27 |
Family
ID=20350356
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1984/000078 WO1984003776A1 (en) | 1983-03-14 | 1984-03-06 | Optical fibre |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0138878A1 (en) |
JP (1) | JPS60500784A (en) |
IT (1) | IT1173818B (en) |
SE (1) | SE8301379L (en) |
WO (1) | WO1984003776A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5123076A (en) * | 1990-02-23 | 1992-06-16 | Sumitomo Electric Industries, Ltd. | Wide band-width high NA optical fiber |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0018110A1 (en) * | 1979-04-04 | 1980-10-29 | The Post Office | Optical fibre core glass, optical fibres containing such glass and process for the manufacture of such glass |
DE2929903A1 (en) * | 1979-07-24 | 1981-02-19 | Kabel Metallwerke Ghh | Glass optical waveguide fibre - which is coated with deformable foamed polymer, and then covered by outer sheath of high strength polymer |
-
1983
- 1983-03-14 SE SE8301379A patent/SE8301379L/en not_active Application Discontinuation
-
1984
- 1984-03-06 EP EP84901121A patent/EP0138878A1/en not_active Withdrawn
- 1984-03-06 WO PCT/SE1984/000078 patent/WO1984003776A1/en not_active Application Discontinuation
- 1984-03-06 JP JP59501162A patent/JPS60500784A/en active Pending
- 1984-03-12 IT IT20012/84A patent/IT1173818B/en active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0018110A1 (en) * | 1979-04-04 | 1980-10-29 | The Post Office | Optical fibre core glass, optical fibres containing such glass and process for the manufacture of such glass |
DE2929903A1 (en) * | 1979-07-24 | 1981-02-19 | Kabel Metallwerke Ghh | Glass optical waveguide fibre - which is coated with deformable foamed polymer, and then covered by outer sheath of high strength polymer |
Non-Patent Citations (1)
Title |
---|
PHYSICS & CHEMISTRY OF GLASSES, Vol 21, No 1, issued 1 February 1980 (Sheffield GB), K J Beales, "Optical fibres of low loss and high numerical aperture", see pages 39-42. * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5123076A (en) * | 1990-02-23 | 1992-06-16 | Sumitomo Electric Industries, Ltd. | Wide band-width high NA optical fiber |
Also Published As
Publication number | Publication date |
---|---|
IT1173818B (en) | 1987-06-24 |
JPS60500784A (en) | 1985-05-23 |
SE8301379L (en) | 1984-09-15 |
EP0138878A1 (en) | 1985-05-02 |
IT8420012A0 (en) | 1984-03-12 |
SE8301379D0 (en) | 1983-03-14 |
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