Experimental demonstration of an improved control design and algorithm for optical communication terminal with disturbance

Vibration interference causes the misalignment between the incident beam and the optical axis of the opto-mechanical terminal system, which also can significantly affect the control stability and reduce the system precision. To better improve the resilience of disturbance and the steady-state accuracy, a novel robustness servo design and disturbance rejection algorithm with iterative learning control for tracking error calibration is proposed. The availability of this system design has been proved from a dynamic tracking experiment, the operating modes are based on different disturbance conditions. The experiment itself focused on the algorithm implementation and tracking stability based on the optical communication terminal assembly. The obtained steady-state response performance during the adjustment process indicates that the tracking errors are below 1.3 μrad. The improved control design and algorithm implementation shows a better disturbance rejection ability. The new approach is also beneficial for the optical communication field.