Pumping light generator and fiber Raman amplifier
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United States of America Patent
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Apr 27, 2004
Grant Date -
Dec 20, 2001
app pub date -
Jun 15, 2001
filing date -
Jun 16, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An object of the present invention is to prevent an increase of the degree of polarization of an output pumping light even if one of pumping light sources has a failure. Laser diodes (30a, 30b) are composed of FP-LDs made of InGaAsP to laser-oscillate at 1480 nm band. The outputs from the laser diodes (30a, 30b) enter a polarizing beam splitter (32) in orthogonal state of polarization and are combined there. The combined light by the polarizing beam splitter (32) enters a depolarizing element (34) and is depolarized there.
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