Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1997-02-19
1999-11-30
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359337, 359160, 372 6, 372 70, H01S 300, H01S 330, G02B 628
Patent
active
059952750
ABSTRACT:
A doped fiber amplifier which provides bidirectional pumping to amplify a signal light, and reduces instability of gain caused by the bidirectional pumping. The doped fiber amplifier includes a rare earth element doped optical fiber, a first light source and a second light source. The optical fiber has first and second ends, with the signal light propagating through the optical fiber from the first end to the second end. The first light source provides pump light which propagates in the optical fiber from the first end to the second end and is at a first wavelength. The second light source provides pump light which propagates in the optical fiber from the second end to the first end and is at a second wavelength. The first wavelength is different from the second wavelength. The pump light provided by the first and second light sources causes the signal light to be amplified as the signal light propagates through the optical fiber.
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Fujitsu Ltd.
Moskowitz Nelson
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