GB2231168A - Optical fibres - Google Patents

Optical fibres Download PDF

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Publication number
GB2231168A
GB2231168A GB8909670A GB8909670A GB2231168A GB 2231168 A GB2231168 A GB 2231168A GB 8909670 A GB8909670 A GB 8909670A GB 8909670 A GB8909670 A GB 8909670A GB 2231168 A GB2231168 A GB 2231168A
Authority
GB
United Kingdom
Prior art keywords
dispersion
optical fibre
optical fibres
rare earth
tailored
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Withdrawn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
GB8909670A
Other versions
GB8909670D0 (en
Inventor
Kevin Christopher Byron
Wilson Sibbett
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.)
STC PLC
Original Assignee
STC PLC
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 STC PLC filed Critical STC PLC
Priority to GB8909670A priority Critical patent/GB2231168A/en
Publication of GB8909670D0 publication Critical patent/GB8909670D0/en
Publication of GB2231168A publication Critical patent/GB2231168A/en
Withdrawn legal-status Critical Current

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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
    • G02B6/02214—Optical fibres with cladding with or without a coating tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
    • 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

Abstract

The dispersion characteristics of an optical fibre are tailored by the addition of an appropriate quantity of rare earth ions, for example 3 to 300 ppm of erbium.

Description

OPTICAL FIBRES.
This invention relates to optical fibres.
According to the present invention there is provided an optical fibre whose dispersion is tailored to a predetermined characteristic by the addition of a corresponding quantity of rare earth ions.
The addition of dopants, such as rare-earth ions, to optical fibres results in a series of absorption bands, In the regions of absorption we have found that the dispersion is anomalous. By choosing the dopant level to adjust the absorption to a particular level, an overall dispersion in the fibre (anomalous plus intrinsic fibre dispersion) can be selected. The dispersion can be adjusted to such a degree that we can choose the fibre characteristics. Rare earths have previously been used as dopants to produce laser fibres and are particularly good dopant materials therefor.
Their use for lasers is tantamount to saying that very strong absorption is obtained. Erbium in particular demonstrates this effect at 1.5cm. Typically the rare-earth dopant8 are of the order of 3 to 300ppm.
Impurities in fibres and the dispersion they produce are in many cases regarded as undesirable, since transmission loss is an inherent result, or at least a nuisance when performing dispersion measurements.
However in the present case the incorporation of impurities leads to the ability to design fibres with desired dispersion characteristics simply by adjusting the amount of dopant (absorption) i.e. tailor the anomalous dispersion to give a desired overall dispersion characteristic.
Such fibre with tailored dispersion has application in, for example, the following areas, e.g.
for optical pulse shaping (such as soliton generation), for short pulses generation and for spectral shaping in short pulses.

Claims (4)

1. An optical fibre whose dispersion is tailored to a predetermined characteristic by the addition of a corresponding quantity of rare earth ions.
2. An optical fibre as claimed in claim 1 wherein the rare earth ions are of the order of 3 to 300 ppm.
3. An optical fibre as claimed in claim 1 wherein the rare earth is erbium.
4. An optical fibre with tailored dispersion characteristics substantially as herein described.
GB8909670A 1989-04-27 1989-04-27 Optical fibres Withdrawn GB2231168A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8909670A GB2231168A (en) 1989-04-27 1989-04-27 Optical fibres

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8909670A GB2231168A (en) 1989-04-27 1989-04-27 Optical fibres

Publications (2)

Publication Number Publication Date
GB8909670D0 GB8909670D0 (en) 1989-06-14
GB2231168A true GB2231168A (en) 1990-11-07

Family

ID=10655839

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8909670A Withdrawn GB2231168A (en) 1989-04-27 1989-04-27 Optical fibres

Country Status (1)

Country Link
GB (1) GB2231168A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2681745A1 (en) * 1991-09-24 1993-03-26 Thomson Csf Optical transmission system with dispersion compensation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1434977A (en) * 1972-10-13 1976-05-12 Sumitomo Electroc Ind Ltd Method of manufacturing an optical waveguide
GB2067986A (en) * 1980-01-28 1981-08-05 Pilkington Brothers Ltd Optical glass fibres and methods of forming such fibres
US4573762A (en) * 1983-06-27 1986-03-04 U.S. Philips Corporation Germanium-free optical fibers having large numerical apertures
GB2175766A (en) * 1985-05-22 1986-12-03 Pa Consulting Services Fibre optic communication systems
EP0243010A1 (en) * 1986-04-24 1987-10-28 BRITISH TELECOMMUNICATIONS public limited company Preparation of glass fibre

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1434977A (en) * 1972-10-13 1976-05-12 Sumitomo Electroc Ind Ltd Method of manufacturing an optical waveguide
GB2067986A (en) * 1980-01-28 1981-08-05 Pilkington Brothers Ltd Optical glass fibres and methods of forming such fibres
US4573762A (en) * 1983-06-27 1986-03-04 U.S. Philips Corporation Germanium-free optical fibers having large numerical apertures
GB2175766A (en) * 1985-05-22 1986-12-03 Pa Consulting Services Fibre optic communication systems
EP0243010A1 (en) * 1986-04-24 1987-10-28 BRITISH TELECOMMUNICATIONS public limited company Preparation of glass fibre

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2681745A1 (en) * 1991-09-24 1993-03-26 Thomson Csf Optical transmission system with dispersion compensation

Also Published As

Publication number Publication date
GB8909670D0 (en) 1989-06-14

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)