Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Takako Takanashi0
Futoshi Izumi0
Date of Patent
March 17, 2009
0Patent Application Number
102880220
Date Filed
November 5, 2002
0Patent Primary Examiner
Patent abstract
In the WDM communication system, in the absence of data to be transmitted on an optical channel, a pilot signal transmitting means transmits the channel-unique pilot signal data on the channel. A WDM communication apparatus on a receiving end detects the pilot signal data in the received WDM signals, and on the basis of the detection result, it evaluates whether each channel is used or not. It is thus easy to recognize which channel is unused (idle) of the WDM signals, so that channel resources can be used effectively according to the traffic.
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