Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2004-12-23
2008-12-09
Pascal, Leslie (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S031000, C398S037000, C398S181000, C398S177000
Reexamination Certificate
active
07463829
ABSTRACT:
An optical transmission apparatus comprising a first detector for detecting the power of the supervisory signal light separated from received wavelength-division multiplexed signal lights; a second detector for detecting the power of the wavelength-division multiplexed signal lights after the separation of the supervisory signal light; a gain-controlled type optical amplifier for amplifying the wavelength-division multiplexed signal lights; an optical attenuator coupled to the amplifier; and a control unit for controlling the optical amplifier and the optical attenuator so as to keep the output level of the wavelength-division multiplexed signal lights to a predetermined target value, wherein the control unit restrains automatic output level control by the optical attenuator when the supervisory signal light power fluctuates within its permissible range and fluctuations in the signal light power have deviated from its permissible range.
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Proceedings of the 1996 Communications Society Conference of the Institute of Electronics, Information and Communication Engineers (IEICE), Lecture No. B1096.
Masuda Hiroshi
Nakano Hiroyuki
Noda Kenta
Uchiyama Yasuhiro
Uda Tetsuya
Hitachi Communication Technologies Ltd.
McDermott Will & Emery LLP
Pascal Leslie
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