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US 6,334,009 B1Granted
Optical signal switching apparatus
AssigneeHitachi, Ltd.
InventorsYasuyuki Fukashiro, Shinichi Kuwano, Kenji Yamahara, Yukio Hayashi, Hideaki Tsushima
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AssigneeHitachi, Ltd.
InventorsYasuyuki Fukashiro, Shinichi Kuwano, Kenji Yamahara, Yukio Hayashi, Hideaki Tsushima
Estimating the term…
An optical signal switching apparatus that maintains an optical switch to a specified state even when noise is generated during the turning on and/or off of power to an optical switch control unit which controls the optical switch. The optical switch control unit includes an optical switch driving unit, a power supply and a power supply surveillance unit. When a specified condition of the power supply is not satisfied, a control signal is generated by the power supply surveillance unit. Upon detection of the control signal the optical switch driving unit, fixes the state of the optical switch to a previously set state without regard to the input to the optical switch driving unit.
An optical signal switch driving apparatus comprising:
In an optical signal switch driving apparatus including an optical switch driving unit which drives an optical switch, and a power supply which provides electric power to the optical switch driving unit, a method of controlling operation of said optical switch driving unit comprising:
Dependencies are inferred from the claim text.