Optical waveguides – Accessories – Attenuator
Reexamination Certificate
2006-05-09
2006-05-09
Kianni, Kaveh (Department: 2883)
Optical waveguides
Accessories
Attenuator
C385S008000, C385S040000
Reexamination Certificate
active
07043132
ABSTRACT:
The intensity of signals in optical networks can be controlled using a variable optical attenuator (VOA). The present invention is a VOA that is particularly well suited for optical networks, for example to provide channel-by-channel normalization of gain control of wavelength division multiplexed signals. The inventive VOA includes a waveguide having a cladding that includes an electro-optical material and electrodes that produce an electric field within the electro-optical material when a voltage difference is applied to the electrodes. The VOA also includes a layer that is parallel to the core of the waveguide and that optically couples to the core to receive light from the attenuated signal. A power meter receives light from the layer as an indication of the amount of light attenuated from the signal and for controlling the voltage to the electrodes.
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patent: 6546163 (2003-04-01), Thackara
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Aoki Shigenori
Glebov Alexei
Nagaeda Hiroshi
Sugimoto Kaoru
Yokouchi Kishio
Dupuis Derek L.
Fujitsu Limited
Kianni Kaveh
Sheppard Mullin Richter & Hampton LLP
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