Optical waveguides – With optical coupler – Plural
Reexamination Certificate
2005-01-11
2005-01-11
Bovernick, Rodney (Department: 2874)
Optical waveguides
With optical coupler
Plural
C385S031000
Reexamination Certificate
active
06842560
ABSTRACT:
A part of a wavelength division multiplexed optical signal output from a multiplexing area is extracted as a check signal, and then the extracted signal is guided to a multiplexing area. A reentered check signal is detected at a facet located opposite a facet from which the check signal has been reentered, and the state of the detected check signal is determined. Furthermore at need, on the basis of the result of the determination, a control signal is output that controls operations of a plurality of optical signals input to the multiplexing area.
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Asaoka Takashi
Fujisaki Kouichi
Kaneko Akimasa
Sakai Yoshihisa
Yamauchi Yoshiki
Bovernick Rodney
Kang Juliana K.
Nippon Telegraph and Telephone Corporation
NTT Electronics Corporation
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