Multi-degree-of-freedom stabilization of large-scale photonic integrated circuits

A control device for controlling a controlled system, wherein the control device comprises at least one input, multiple output ports, a processor and a signal generator;

• wherein the signal generator is configured to transmit multiple actuation signals to multiple degree of freedom (DOF) points of the controlled system;
• wherein the multiple actuation signals comprise multiple alternating current (AC) components that are mutually orthogonal;
• wherein the processor is configured to measure at least one feedback signal from at least one probe point of the controlled system;
• wherein a number of DOF points of the controlled system exceeds a number of the at least one probe point;
• wherein the processor is configured to determine, based upon the at least one feedback signal, values of line search pulses to be sent to the multiple DOF points during at least one line search iteration;
• and wherein the signal generator and the processor are configured to participate in a performing, of the at least one line search iteration.

A non-transitory computer readable medium that stores instructions that once executed by a control device cause the control device to execute the steps of:

• transmitting multiple actuation signals to multiple degree of freedom (DOF) points of the controlled system;
• wherein the multiple actuation signals comprise multiple alternating current (AC) components that are mutually orthogonal;
• measuring at least one feedback signal from at least one probe point of the controlled system;
• wherein a number of DOF points exceeds a number of the at least one probe point;
• determining, based upon the at least one feedback signal, values of line search pulses to be sent to the multiple DOF points during at least one line search iteration;
• and performing the at least one line search iteration.