Optical waveguides – With optical coupler – Particular coupling function
Patent
1990-07-13
1992-02-11
Lee, John D.
Optical waveguides
With optical coupler
Particular coupling function
372 6, 385126, 385142, 359341, G02B 626
Patent
active
050871080
ABSTRACT:
The invention relates to an optical amplifier, in particular for optical fiber telecommunication lines (1), operating with a transmission signal in a predetermined wavelength range, which amplifier comprises a fluorescent active optical fiber (6) doped with erbium, having two cores (11 and 12, 101 and 102), one (11, 101) of which is connected to a fiber (4) in which a transmission signal to be amplified and a luminous pumping energy are multiplexed, and to an outgoing fiber adapted to transmit the amplified signal, whereas the second core (12, 102) is optically coupled to the first core and 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.
REFERENCES:
patent: 4546476 (1985-10-01), Shaw et al.
patent: 4723824 (1988-02-01), Shaw et al.
patent: 4959837 (1990-09-01), Fevrier et al.
Patent Abstracts of Japan, vol. 11, No. 156 (p-578) [2603], 21st May 1987; and JP-A-61 292 102 (Nippon Telegr. & Teleph. Corp.) 22-12-1986.
Appleyard Andrew P.
Grasso Giorgio
Scrivener Paul L.
Lee John D.
Ngo John
Societa Cavi Pirelli S.p.A.
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