The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 26, 1999
Filed:
Mar. 13, 1996
Satoru Miyazaki, Fukuoka, JP;
Kazuya Amaki, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
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.