Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2007-03-28
2010-02-02
Phan, Hanh (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S079000, C398S045000, C398S048000, C398S084000, C385S024000, C385S037000
Reexamination Certificate
active
07657181
ABSTRACT:
In an optical add/drop multiplexer dropping and inserting a light of a specific wavelength for a WDM signal light and an optical network system utilizing the same, a wavelength selective switch selects a part of WDM signal lights inputted as lights of drop wavelengths and outputting other lights, and a reject/add filter terminates lights of same wavelengths as add wavelengths among output lights from the wavelength selective switch and multiplexes other lights than the terminated lights and lights of the add wavelengths to be outputted. At this time, the drop wavelengths are made to include all of the add wavelengths.
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Nakagawa Goji
Terai Noboru
Fujitsu Limited
Phan Hanh
Staas & Halsey , LLP
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