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:
Apr. 23, 2002
Filed:
Mar. 03, 2000
Kazuyo Mizuno, Tokyo, JP;
Shyoichi Ozawa, Tokyo, JP;
Osamu Aso, Tokyo, JP;
Shu Namiki, Tokyo, JP;
Ikuo Ohta, Tokyo, JP;
Yuichiro Irie, Tokyo, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
In an optical gain equalizer according to the present invention, a plurality of etalon filters and one ore more fiber gratings or dielectric multilayer filters are arranged in line, and a beam of light externally applied is passed through the etalon filters and the fiber gratings or dielectric multilayer filters and outputted to the outside, and the etalon filters have sinusoidal wave loss characteristic of the same amplitude and period as those of the term obtained by Fourier series expansion of the loss wavelength characteristic for gain flattening, and the one or more fiber gratings or dielectric multilayer filters compensate the ripple component remaining as the difference between the loss wavelength characteristic for gain flattening and the loss wavelength characteristic owing to the etalon filters . An optical amplifying device is constituted by combining an optical amplifier with the optical gain equalizer . A wavelength-division multiplex transmitter is constituted by using the optical amplifying device