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:
Mar. 06, 2007
Filed:
Oct. 08, 2004
Masaji Noguchi, Yokohama, JP;
Toshihisa Kyouno, Yokohama, JP;
Hideyuki Miyata, Kawasaki, JP;
Yutaka Kai, Kawasaki, JP;
Masaji Noguchi, Yokohama, JP;
Toshihisa Kyouno, Yokohama, JP;
Hideyuki Miyata, Kawasaki, JP;
Yutaka Kai, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A drop-type AOTF is used as a configuration for removing from a through signal an optical signal having the same wavelength as that of an optical signal to be added. To the drop-type AOTF, RF signals are input to always select all of wavelengths, and an RF signal is not input for a wavelength desired to be rejected. As a result, the optical signal having the wavelength for which the RF signal is stopped is not selected by the drop-type AOTF, and cannot pass through. Since there is only one RF signal whose input is stopped, a 'drawing effect' does not occur, and control of an optical add/drop device is simplified. Additionally, since high-speed switching can be made, and a wavelength to be added can be varied, restrictions are not imposed on a network configuration.