Optical amplification fiber, fiber optic amplifier, and optical communication system
AssigneeSumitomo Electric Industries, Ltd.
InventorsMotoki Kakui, Masahiro Takagi
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Abstract
This invention relates to an optical amplification fiber having a structure capable of exhibiting an excellent amplification characteristics, and the like. In the optical amplification fiber, the ratio (αP/αS) of an unsaturated absorption peak value αP in a pumping light wavelength band of 0.98 μm to an unsaturated absorption peak value as in a signal wavelength band of 1.55 μm is 0.8 or more and, more preferably, 0.9 or more.
Claims10
An optical amplification fiber having a light propagating region whose at least part is doped with a rare earth element, and being capable of amplifying signals by using supplied pumping light,
- wherein a ratio (αP/αS) of an unsaturated absorption peak value αP in a pumping light wavelength band of 0.98 μm to an unsaturated absorption peak value αS in a signal wavelength band of 1.55 μm is 0.8 or more.
An optical amplification fiber comprising:
- a core region having at least a part doped with a rare earth element and having a predetermined refractive index;
- and
- a cladding region provided on the outer periphery of said core region and having a refractive index lower than that of said core region,
- wherein an outer diameter of said core region and a relative refractive index difference between said core region and said cladding region are set so that a ratio (αP/αS) of an unsaturated absorption peak value αP in a pumping light wavelength band of 0.98 μm to an unsaturated absorption peak value αS in a signal wavelength band of 1.55 μm becomes 0.8 or more.
Dependencies are inferred from the claim text.