Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2006-11-21
2006-11-21
Phan, Nanh (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S079000, C398S005000, C398S015000, C398S091000, C398S030000, C398S031000, C398S033000, C398S140000, C398S141000, C398S151000, C398S095000, C385S024000, C385S037000
Reexamination Certificate
active
07139484
ABSTRACT:
Disclosed herein is a signal transmission method in a wavelength-division-multiplex (WDM) transmission system. The WDM transmission system comprises a first WDM terminal for transmitting a WDM signal, a second WDM terminal for receiving the WDM signal, and an optical add-drop multiplexer (OADM) node for transmitting to a network element an optical signal of a specific wavelength of the WDM signal which is transmitted between the first and second WDM terminals. The WDM signal is transmitted from the first WDM terminal to the second WDM terminal regardless of whether an optical signal is added or dropped at the OADM node. The network element employs an optical signal of an idle wavelength of the WDM signal that has no transmission data, to transmit another transmission data that is transmitted by the network element.
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European Search Report dated Mar. 6, 2006.
Communication pursuant to Article 96(2) EPC dated Jul. 13, 2006.
Izumi Futoshi
Kurumida Junya
Katten Muchin & Rosenman LLP
Phan Nanh
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