Abstract: A feedback control system for an optical switch includes a reference mirror that reflects a signal wavelength of light and transmits a reference wavelength. A detector array indicates positions, on the reference mirror, of first and second reference light beams transmitted through the reference mirror onto the detector array. An array of adjustable mirrors is controlled by a controller for adjusting each mirror in the array. The controller receives the position of the first reference light beam and adjusts a first mirror so that the first position is moved to a pre-determined location on the detector array, and receives the position of the second reference light beam and adjusts a second mirror so that the second position is moved to the same pre-determined location on the detector array, forming an aligned optical path on which a signal light beam can be transmitted through the optical switch.