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:
Oct. 04, 2005
Filed:
Sep. 22, 2000
Tetsufumi Tsuzaki, Yokohama, JP;
Masayuki Nishimura, Yokohama, JP;
Masayuki Shigematsu, Yokohama, JP;
Hitoshi Hatayama, Yokohama, JP;
Eisuke Sasaoka, Yokohama, JP;
Tetsufumi Tsuzaki, Yokohama, JP;
Masayuki Nishimura, Yokohama, JP;
Masayuki Shigematsu, Yokohama, JP;
Hitoshi Hatayama, Yokohama, JP;
Eisuke Sasaoka, Yokohama, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A optical filter has a loss spectrum whose gradient dL/dλ of a loss L (dB) with respect to the wavelength λ (nm) is variable in the wavelength band of multiplexed signal light. A control circuit detects each power of signal light components demultiplexed by an optical coupler and controls the power of optical pumping light to be supplied to an optical amplification section from an optical pumping light sources such that the power of output signal light has a predetermined target value. The control circuit also controls the gradient dL/dλ of the optical filter on the basis of powers of the signal light components.