Method and apparatus for variable optical attenuation for an...

Optical waveguides – With optical coupler – Switch

Reexamination Certificate

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C385S017000, C385S018000

Reexamination Certificate

active

11063453

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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