Mirror drift compensation in an optical circuit switch

An optical circuit switch, comprising:

• a first port uniquely associated with a rotatable mirror element;
• a second port;
• a controller configured to:
• receive a first make command to make a first optical connection between a first port and a second port, the first port uniquely associated with a rotatable mirror element;
• determine a first baseline voltage to be applied to an electrode coupled to the mirror element to cause the mirror element to rotate about an axis to make the first optical connection;
• apply the first baseline voltage to the electrode;
• periodically adjust the voltage applied to the electrode to minimize an insertion loss of the first optical connection;
• periodically store accumulated drift data in a memory, the accumulated drift data derived from a difference between the adjusted voltage applied to the first electrode and the first baseline voltage;
• receive a break command to break the first optical connection;
• apply an at-rest voltage to the first electrode;
• and
• decay the accumulated drift data in accordance with a predetermined decay function.