Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1991-01-09
1992-05-05
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
372 6, 372 23, H01S 316, H01S 309, G02B 600
Patent
active
051113341
ABSTRACT:
A fiber-optic amplifier, whose light signal input and light signal output may be connected with a monomode fiber for 1536 nm light signals, is composed of two or more cascade connected amplifier stages including a fiber piece that amplifies light signals and is doped with at least one lanthanoid, a wavelength selective directional coupler and a pump light source. The output end of the fiber piece of one amplifier stage, when seen in the direction of travel of the light signals, is connected with the one input of the directional coupler of the next-following amplifier stage. The fiber pieces of the individual amplifier stages are different from one another with respect to length and/or doping and/or basic material so as to realize maximum gain for different wavelengths. Such a fiber-optic amplifier offers nearly constant gain over a broad wavelength range.
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ALCATEL N.V.
Moskowitz Nelson
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