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:
Feb. 20, 2007
Filed:
Sep. 03, 2004
Motoki Kakui, Kanagawa, JP;
Chie Fukuda, Kanagawa, JP;
Motoki Kakui, Kanagawa, JP;
Chie Fukuda, Kanagawa, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
An optically amplifying waveguide that can have a gain having a small wave-length dependency in a wavelength range shorter than the C-band, and the like. The optical amplifier moduleoptically amplifies a signal lightwave that has a wavelength lying in a wavelength range of 1,490 to 1,530 nm and that has entered an input connectorto output the optically amplified signal lightwave from an output connectorAn optical isolatora WDM coupleran Er-doped optical fiber (EDF)a WDM couplerand an optical isolatorare provided in this order on a signal lightwave-transmitting path from the input connectorto the output connectorA pump sourceconnected to the WDM couplerand a pump sourceconnected to the WDM couplerare also provided. In the EDFat least one of the stimulated-emission cross section and the absorption cross section assumes a maximum value at the shorter-wavelength side of a peak at a wavelength range of 1.53 μm.