Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2007-03-02
2011-10-04
Sedighian, M. R. (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S094000
Reexamination Certificate
active
08032028
ABSTRACT:
Optical add/drop nodes are used in a network having a pair of optical transmission paths for transmitting optical signals in opposite directions to each other. Each add/drop node comprises a variable split ratio optical coupler for splitting an optical signal output from a transmitter. The split ratio of the variable split ratio optical coupler is set such that the optical power levels of the signals added through the respective optical add/drop nodes are equal to one another respectively on the pair of optical transmission paths.
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Aoki Yasuhiko
Kai Yutaka
Sone Kyosuke
Takita Yutaka
Fujitsu Limited
Fujitsu Patent Center
Sedighian M. R.
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