Method and apparatus for variable optical attenuation for an optical switch
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United States of America Patent
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Dec 25, 2007
Grant Date -
Aug 24, 2006
app pub date -
Feb 23, 2005
filing date -
Feb 23, 2005
priority date (Note) -
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Abstract
A controller in an optical switch providing optical coupling of an optical signal between a source port and a target port employs, in at least one axis, gradient control using a feedback loop that compensates for alignment error between a source port and a target port in an optical switch. In at least one other axis, the controller generates a control input according to a control law that results in variable attenuation of optical coupling between the source port and the target port in the optical switch. A dither signal may be applied to the control input in the at least one other axis. Amplitude of the applied dither signal may be varied.
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