Doped optical fiber laser amplifier
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United States of America Patent
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Sep 25, 1990
Grant Date -
N/A
app pub date -
Nov 13, 1989
filing date -
Nov 10, 1988
priority date (Note) -
Expired
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Abstract
An erbium-doped fiber laser amplifier (1), characterized by the fact that said fiber (3) is doped to a concentration lying in the range 5 ppm to 50 ppm, that the length of said fiber lies in the range 250 m to 30 m depending on the selected concentration of doping, and that the radial position of the doped zone substantially coincides with the energy maximum of the set of propagation modes in said fiber at the pumping wavelength.
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