Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1997-08-29
2000-03-28
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359134, 359343, 385127, H01S 306, G02B 622
Patent
active
060439300
ABSTRACT:
An optical amplifier having an optical waveguide structure which includes a first region in which a first dopant (for example, Er) is doped in a first glass composition (for example, Al--Si glass) and a second region in which a second dopant (for example, Er) and a third dopant (for example, Yb) are doped in a second glass composition (for example, Al--P--Si glass). The first dopant is pumped so that the optical waveguide structure may provide a first gain characteristic determined by the first glass composition and the first dopant. The third dopant is pumped so that the optical waveguide structure may provide a second gain characteristic determined by the second glass composition and the second dopant. By selectively obtaining the first and second gain characteristics, where the optical amplifier is applied to WDM (wavelength division multiplexing), the output powers of optical signals of different channels can be controlled independently of each other.
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Fujitsu Limited
Moskowitz Nelson
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