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. 14, 2012
Filed:
Apr. 28, 2009
Tomoaki Takeyama, Kawasaki, JP;
Ichiro Nakajima, Kawasaki, JP;
Keiko Sasaki, Kawasaki, JP;
Shinichirou Muro, Kawasaki, JP;
Etsuko Hayashi, Kawasaki, JP;
Tomoaki Takeyama, Kawasaki, JP;
Ichiro Nakajima, Kawasaki, JP;
Keiko Sasaki, Kawasaki, JP;
Shinichirou Muro, Kawasaki, JP;
Etsuko Hayashi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In an optical transmission apparatus, levels of signal lights obtained by demultiplexing a WDM signal and corresponding to channels are detected, based on which a channel in which a signal is transmitted and a channel in which no signal is transmitted are determined. An attenuation amount of a channel in which no signal is transmitted in a predetermined range from the channel in which the signal is transmitted is set to a value equal to an attenuation amount of the channel in which the signal is transmitted. An attenuation amount of a channel in which no signal is transmitted out of the predetermined range from the channel in which the signal is transmitted is set to a value larger than the attenuation amount of the channel in which the signal is transmitted. The signal lights are attenuated based on the values and multiplexed.