Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1996-03-13
1999-01-26
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359134, 359187, 359345, H01S 300, G02F 139
Patent
active
058644229
ABSTRACT:
In a light amplifier device having a rare-earth element doped optical fiber to which an input light signal and an exciting light are applied, an exciting-light emitting part generates the exciting light. A variable attenuator which attenuates the exciting light applied. A driving part which supplies a driving current to the exciting light part. A monitor part monitors the input light signal. A light-emitting part generates a light in a wavelength band which includes a wavelength of the input light signal. A control part for controlling either the attenuator or driving part, when the monitor part detects a change in the input light signal, so that the light generated by the light-emitting part is applied to the rare-earth element doped optical fiber.
REFERENCES:
patent: 5138621 (1992-08-01), Goto
patent: 5500762 (1996-03-01), Uchiyama et al.
patent: 5510926 (1996-04-01), Bayart et al.
Furukawa et al, IEEE Photonies. Techn. Lett., (USA), vol. 7, #5, pp. 540-542, May 1995; abst. only herewith.
Amaki Kazuya
Miyazaki Satoru
Fujitsu Limited
Moskowitz Nelson
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