Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1996-03-19
1997-12-23
Hellner, Mark
Optical: systems and elements
Optical amplifier
Optical fiber
359124, H01S 300
Patent
active
057011940
ABSTRACT:
An optical telecommunication system includes means for generating optical signals of different wavelengths, an optical-fibre line with amplifying means, a pre-amplifer, and receiving means. The the pre-amplifier comprises an optical waveguide doped with a rare earth material, differential-attenuation means located at a first position along the doped waveguide and capable of causing an attenuation in the signal band which is greater than the attenuation caused at the pumping wavelength, and filtering means located at a second position and adapted to attenuate by a value higher than a predetermined minimum, the spontaneous emission in a wavelength band contiguous with the signal band.
The position and attenuation of the differential-attenuation means and filtering means and the wavelength band are selected in a functional relation with respect to each other in order to limit the output power variations from the pre-amplifier.
REFERENCES:
patent: 5050949 (1991-09-01), DiGiovanni et al.
patent: 5280383 (1994-01-01), Federici et al.
patent: 5406411 (1995-04-01), Button et al.
patent: 5430577 (1995-07-01), Hugenell
patent: 5455710 (1995-10-01), Takeda
patent: 5506723 (1996-04-01), Junginger
Meli Fausto
Piciaccia Stefano
Hellner Mark
Pirelli Cavi S.p.A.
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