Gain flattened optical amplifier
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United States of America Patent
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Issued Date -
Sep 18, 2003
app pub date -
Mar 16, 2002
filing date -
Mar 16, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A wave guide amplifier is presented which has a relatively flat gain over a band of wavelengths. In some embodiments, the amplifier is an erbium doped amplifier and the gain is flat to within 2.5 dB across the C-band. Gain flattening can be accomplished by adjusting the concentration of ground state rare earth ions so that a portion of the signal light is absorbed throughout the amplifier. Signal light at wavelengths corresponding to peaks in the emission spectrum tend to be absorbed more readily than other wavelengths, thereby flattening the gain characteristic of the amplifier.
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