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US 5,633,964 AGranted
Article comprising a multi-stage erbium-doped fiber amplifier
AssigneeLucent Technologies Inc.
InventorsDavid J. DiGiovanni, Gloria R. Jacobovitz-Veselka, Paul F. Wysocki
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Abstract
Multistage Er-doped fiber amplifiers (EDFAs) advantageously use high numerical aperture (NA) fiber in the input stage, and low NA fiber in the output stage. The former typically is greater than 0.25, and the latter is less than 0.20. Such amplifiers can have high gain and low noise figure.
Claims7
An article comprising a multistage optical fiber amplifier having an input port and an output port, with a signal transmission path connecting said input and output ports;
- said signal transmission path comprises a first length of Er-doped optical fiber in an input amplifier stage, and a second length of Er-doped optical fiber in an output amplifier stage;
- and the multistage optical fiber amplifier further comprises means for coupling a pump radiation into said signal transmission path;
- CHARACTERIZED IN THAT
- the first length of Er-doped optical fiber is selected to have a numerical aperture of value NA.sub.1, and the second length of Er-doped optical fiber is selected to have a numerical aperture of value NA.sub.2, where NA.sub.1 is greater than NA.sub.2, with (NA.sub.1 -NA.sub.2)/NA.sub.1 >0.1.
1 more element
Dependencies are inferred from the claim text.