Patent ID: 6577652
Filing Date: 2003-06-10
Classification: H04J

Abstract:
An OADM (Optical Add-Drop Multiplexer) of WDM (Wavelength Division Multiplex) optical signals having a plurality of wavelength components, the OADM comprising:an optical demultiplexer for demultiplexing the WDM optical signals inputted to the optical demultiplexer into individual optical signals, each of the individual optical signals having a respective one of the wavelength components of said WDM optical signals and being outputted to a respective one of optical paths; an output-signal leveling unit for automatic feedback control of an optical intensity of said individual optical signals inputted through the respective optical paths; at least one optical switch inserted in selected optical paths, the optical switch dropping a first optical signal inputted from the optical demultiplexer and connecting a second optical signal to the output-signal leveling unit when operated in an add/drop mode, and passing the first optical signal to the output-signal leveling unit when operated in a through mode; and an optical multiplexer for multiplexing the individual optical signals outputted from the output-signal leveling unit into the WDM optical signals to be outputted.