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:
Nov. 11, 2008
Filed:
Nov. 22, 2004
Yoshio Nabeyama, Yokohama, JP;
Kenji Ohta, Kawasaki, JP;
Yoshio Nabeyama, Yokohama, JP;
Kenji Ohta, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
WDM optical tranmsmission equipment with redundant configuration includes a plurality of tranmitters. Each tranmitter includes active and standby panels including active and standby optical transmission circuits respectively having active and standby attenuators for controlling an attenuation amount of each output of the active and standby optical transmission circuits; and a coupler combining the outputs of the active and standby attenuators. An output light wavelength of the standby optical transmission circuit is set to a set wavelength different from the output light wavelength of the active optical transmission circuit, and the attenuation amount of the standby attenuator is set to the maximum, and the standby panel is set, and subsequently, the set wavelength of the output light of the standby optical transmission circuit is set to a target wavelength identical to the output light wavelength of the active optical transmission circuit, each having, and a wavelength control method of the light output in the standby system. The problem is solved of the light emitted in a standby system as affecting an active system, while the active system is in operation.