Optical signal switching apparatus
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United States of America Patent
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-
May 8, 2001
Grant Date -
N/A
app pub date -
Oct 30, 1998
filing date -
Nov 26, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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.
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