Abstract: An optical cross switch device for selectively switching light beams between a plurality of fiber optic elements. The device includes an input fiber mounting assembly for securing at least one input fiber terminating in a fiber end for radiating an associated input light beam; collimating means for collimating the at least one input light beam; focusing means for focusing light beams incident thereon; an output fiber mounting assembly for securing at least one output fiber terminating in an output fiber end for receiving an associated light beam; and at least one mirror unit having at least one reflective element for selectively redirecting an associated one of the collimated input light beams toward an associated selected one of the output fiber ends via the focusing means.