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. 01, 2002
Filed:
Feb. 10, 2000
Mikiya Suzuki, Tokyo, JP;
Sigeru Shikii, Tokyo, JP;
Oki Electric Industrial Co. Ltd., Tokyo, JP;
Abstract
According to the present invention, an optical fiber amplifier is provided, including: an erbium-doped fiber to which a multiplexed optical signal into which a plurality of optical signals in a long-wavelength band are multiplexed is supplied and which performs amplification in the long-wavelength band; a forward-pumping light source for supplying forward-pumping light to the erbium-doped optical fiber; a backward-pumping light source for supplying backward-pumping light to the erbium-doped optical fiber, the backward-pumping light source having an output power variable based on a control signal; an input-power detector for detecting an input power of the multiplexed optical signal input to the erbium-doped fiber; a temperature detector for detecting a temperature of the erbium-doped fiber; and a control circuit for outputting the control signal based on the input power detected by the input-power detector and the temperature detected by the temperature detector, the control signal changing the output power of the backward-pumping light source to cancel deviation of the amplification of the multiplexed optical signal.