EP0426222A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Active fiber optical amplifier having a wide band signal wavelength
Assignee: Pirelli and C SpA
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Filing: 1990-10-15
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Granted: —
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Expires: 2010-10-15
Abstract
Abstract The present invention relates to an optical amplifier, in particular for optical fiber telecommunication lines, operating with a transmission signal in a predetermined wavelength range, which amplifier comprises laser emitting active optical fiber doped with erbium, said fiber contains a further doping substance, distributed along the fiber, said doping substance shows an absorption, for a light having a wavelength lower than 1,540 nm, substantially higher than the absorption that the further doping substance shows for a light having a wavelength varying from 1,540 nm to the superior limit of the predetermined wavelength range of the transmission signal; preferably the further doping substance is samarium. Samarium contained in the fiber is capable of absorbing the spontaneous erbium emission, which would constitute a noise source, allowing a signal to be amplified in a wavelength range substantially corresponding to the tolerance range of the commercially available signal laser emitters.
Inventors
- 👤 Giorgio Grasso
- 👤 Aldo Righetti
- 👤 Flavio Fontana
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 21:05
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/06; H01S3/063; H01S3/067; H01S3/06708; H01S2301/00; H01S2301/04; H01S3/14; H01S3/16; H01S3/1691; H01S3/1698
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
111 words
Optical fiber comprising laser emission doping substances, particularly to be used in fiber optical amplifiers for optical telecommunication lines, said optical fiber containing erbium as laser emission doping substance, adapted to receive a telecommunication signal from a laser emitter, in a prefixed wavelength range, characterised by the fact that said optical fiber comprises a further doping substance distributed along the fiber, said doping substance shows an absorption for a light having a wavelength lower than 1,540 nm, substantially higher than the absorption that said further doping substance shows for a light having a wavelength varying from 1,540 nm to the superior limit of the predetermined wavelength range of the transmission signal.
Claim 2
Dependent Claim
111 words
Optical fiber comprising laser emission doping substances, particularly to be used in fiber optical amplifiers for optical telecommunication lines, said optical fiber containing erbium as laser emission doping substance, adapted to receive a telecommunication signal from a laser emitter, in a prefixed wavelength range, characterised by the fact that said optical fiber comprises a further doping substance distributed along the fiber, said doping substance shows an absorption for a light having a wavelength lower than 1,540 nm, substantially higher than the absorption that said further doping substance shows for a light having a wavelength varying from 1,540 nm to the superior limit of the predetermined wavelength range of the transmission signal.
Claim 3
Dependent Claim
29 words
Optical fiber comprising laser emission doping substances according to claim 1, characterised by the fact that the further doping substance is samarium in the form of a trivalent cation.
Claim 4
Dependent Claim
43 words
Optical fiber comprising laser emission doping substances according to claim 2, characterised by the fact that the samarium concentration in the fiber, with respect to the erbium concentration in the same fiber, expressed as a percentage by weight of the contained oxides, is
Claim 5
Dependent Claim
92 words
Optical amplifier, particularly for optical fiber telecommunication lines operating with a transmission signal in a predetermined wavelength range, comprising a laser emission active optical fiber doped with erbium, characterised by the fact that the active optical fiber contains a further doping substance distributed along the fiber, said doping substance shows an absorption, for a light wavelength less than 1,540 nm, substantially higher than the absorption that the further doping substance shows for a light wavelength varying from 1,540 nm to the superior limit of the wavelength range predetermined of the transmission signal.
Claim 6
Dependent Claim
92 words
Optical amplifier, particularly for optical fiber telecommunication lines operating with a transmission signal in a predetermined wavelength range, comprising a laser emission active optical fiber doped with erbium, characterised by the fact that the active optical fiber contains a further doping substance distributed along the fiber, said doping substance shows an absorption, for a light wavelength less than 1,540 nm, substantially higher than the absorption that the further doping substance shows for a light wavelength varying from 1,540 nm to the superior limit of the wavelength range predetermined of the transmission signal.
Claim 7
Dependent Claim
29 words
Optical fiber according to claim 4, characterised by the fact that the active optical fiber further doping substance is formed by samarium in the form of a trivalent cation.
Claim 8
Dependent Claim
42 words
Optical amplifier according to claim 4, characterised by the fact that the samarium concentration in the active optical fiber with respect to the erbium concentration in the fiber, expressed as a percentage by weight of the oxides contained in the fiber is
References Cited (Backward Citations)
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