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. 24, 2015
Filed:
Sep. 12, 2012
Mineshi Nakashima, Kawasaki, JP;
Yasuko Nozu, Kawasaki, JP;
Katsuhiro Shirai, Kawasaki, JP;
Koji Takeguchi, Kawasaki, JP;
Toshihiro Togo, Kawasaki, JP;
Mineshi Nakashima, Kawasaki, JP;
Yasuko Nozu, Kawasaki, JP;
Katsuhiro Shirai, Kawasaki, JP;
Koji Takeguchi, Kawasaki, JP;
Toshihiro Togo, Kawasaki, JP;
FUJITSU LIMITED, Kawasaki, JP;
Abstract
A noise suppression method is used in an optical transmission system which includes node equipments transmitting a WDM optical signal. First node equipment drops a first optical signal from the WDM optical signal. The method includes: transmitting a failure signal that specifies the first optical signal from second node equipment to the first node equipment via a first route when the second node equipment arranged on the first route for transmitting the first optical signal to the first node equipment has detected a failure of the first optical signal; transmitting a shutoff signal that specifies the first optical signal from the first node equipment toward the second node equipment via the first route; and shutting off an optical output of a wavelength corresponding to the first optical signal in third node equipment that has relayed the failure signal and has received the shutoff signal.