Optical: systems and elements – Optical modulator – Light wave temporal modulation
Reexamination Certificate
2007-07-17
2007-07-17
Thompson, Timothy (Department: 2873)
Optical: systems and elements
Optical modulator
Light wave temporal modulation
C359S239000, C359S248000
Reexamination Certificate
active
11527561
ABSTRACT:
A light modulation apparatus including a Mach-Zehnder type light modulator, a driver for modulator outputting a control signal according to an input electric signal, a light branching circuit branching the output light signal, and a bias control circuit applying a bias voltage to the light modulator based on the branched light signal, the apparatus further comprises: a burst pause state detection circuit detecting a pause state of a burst signal included in the input electric signal; a photoelectric transducer converting an output light signal branched by the light branching circuit into an electric signal; a sampling circuit extracting the electric signal converted while the pause state is detected by the burst pause state; and a bias voltage adjustment circuit adjusting a bias voltage value of the bias voltage based on a voltage level of the extracted electric signal.
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Great Britain Search Report.
Doi Kousuke
Ikezawa Katsuya
Kobayashi Toshi-aki
Matsuura Hiroyuki
Miura Akira
Thompson Timothy
Yokogawa Electric Corporation
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