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. 04, 2008
Filed:
Jul. 10, 2006
Tooru Hirai, Yokohama, JP;
Yasuyuki Fukashiro, Yokohama, JP;
Tooru Hirai, Yokohama, JP;
Yasuyuki Fukashiro, Yokohama, JP;
Hitachi Communication Technologies, Ltd., Tokyo, JP;
Abstract
In working path setting, a backup path is previously prepared assuming a link failure, and a demultiplexer of a bypass link is connected to a wavelength conversion repeater through an optical switch. Upon occurrence of a link failure, the wavelength conversion repeater is connected to a multiplexer of the bypass link by means of the optical switch to forward an in-channel control signal to the wavelength conversion repeater of an adjacent node where the in-channel control signal is sequentially forwarded to reserve a backup bandwidth. Then, output wavelengths and targets are exchanged between a wavelength tunable transponder and the wavelength tunable repeater.