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US 5,295,015 AGranted
Optical amplifying apparatus
AssigneeNEC Corporation
InventorKenichi Yoneyama
Life of this patent
Estimating the term…
Abstract
An optical amplifying apparatus of the present invention has an optical amplifier for directly amplifying an input signal, and an optical splitter for reflecting a noise light which occurs in the amplifier and is supplied backward therefrom. An amount of the backward noise light is used to detect an S/N ratio of an output light or the like.
Claims11
An optical amplifying apparatus, comprising:
- an optical amplifier for directly amplifying an input light to provide an output light, said optical amplifier generating forward and backward noise lights, said output light containing said forward noise light;
- means for detecting said backward noise light;
- and
- means for calculating the forward noise light contained in said output light based on the backward noise light detected by said detecting means.
1 more element
An optical amplifying apparatus, comprising:
- a first optical amplifier for directly amplifying an input light;
- a second optical amplifier for directly amplifying a signal supplied from said first amplifier;
- an optical splitter connected between said first and second optical amplifiers, wherein said input light passes therethrough and noise light occurring in said second optical amplifier is reflected thereat;
- and
- means for detecting said reflected noise light.
2 more elements
Dependencies are inferred from the claim text.