Patent EP0439867B1 successfully refreshed from Google Patents.
EP0439867B1
Expired / Lapsed
EP
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Optical power amplifier with doped active fibre
Assignee: Pirelli and C SpA
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Filing: 1990-12-24
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Granted: 1994-06-08
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Expires: 2010-12-24
Abstract
Abstract The invention regards an optical power amplifier, particularly for telecommunication lines with optical fibres, of the type comprising an active fiber doped with a fluorescent substance, in particular Erbium, pumped with a pump laser with output at a wavelength of 980 nm, in which the active fiber contains Al2O3 as refraction index modifying dopant; the amplifier presents a particularly high amplification efficiency, next to the maximum theoretic efficiency. <IMAGE>
Inventors
- 👤 Giorgio Grasso
- 👤 Aldo Righetti
- 👤 Fausto Meli
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 17:24
CPC Classifications
G; G02; G02F; G02F1/00; H; H01; H01S; H01S3/00; H01S3/05; H01S3/06; H01S3/063; H01S3/067; H01S3/06708; H01S3/09; H01S3/091; H01S3/094; H01S3/094003; H01S3/094011; H01S3/14; H01S3/16; H01S3/1691; H01S3/1693
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
An optical power amplifier (4) comprising an active doped fibre (8) containing Al₂O₃ as refractive index modifying dopant and Erbium as fluorescent dopant in the core, supplied with pump light from one or two pumping lasers (7, 12) through a dichroic coupler (5, 13) and connecting a transmission signals emitter (1) to an optical fibre telecommunication line (2), characterised in that said emitter (1) provides a high power input signal to the fibre (8) such that the amplifier (4) operates in saturation conditions for the stimulated output of said fluorescent doping material and said pumping lasers (7, 12) exibit a pumping wavelength of 980 nm.
Claim 2
Dependent Claim
29 words
An optical power amplifier according to claim 1, characterised in that the Erbium concentration in said fiber expressed in weight of Er₂O₃, is included between 30 and 2000 ppm.
Claim 3
Dependent Claim
29 words
An optical power amplifier according to claim 2, characterised in that the Erbium concentration in the fiber, expressed in weigh of Er₂O₃, is included between 30 and 1000 ppm.
Claim 4
Dependent Claim
30 words
An optical power amplifier according to claim 1, characterised in that the active fiber (8) is monomodal at the wavelength of the transmission signal but not at the pump wavelength.
Claim 5
Dependent Claim
29 words
An optical power amplifier according to claim 1, characterised in that the active fiber (8) is monomodal at the wavelength of the transmission signal and at the pump wavelength.
Claim 6
Dependent Claim
55 words
An optical power amplifier according to claim 1, characterised in that it includes two pumping lasers (7, 12) connected to the two ends of the active fiber (8) through respective dichroic couplers (5, 13), orientated with input direction of the light power emitted by the pump laser (7, 12) directed toward the active fiber (8).
References Cited (Backward Citations)
No citation records indexed.
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