Abstract: An optical switch includes a light transmitting/receiving sub-assembly and a reflecting device rotatable relative to and confronted with the light transmitting/receiving array sub-assembly. The reflecting device includes two reflecting strips perpendicular to each other. One of the reflecting strips is consisted of two symmetrically arranged 90-degree angled mirrors, and the other includes four symmetrically arranged 90-degree angled mirrors. The sub-assembly includes two linear arrays of collimators which are positioned on a circular disk and are perpendicular to each other corresponding to the two reflecting strips. The collimators of each collimator array are equally spaced from each other. By rotating the light transmitting/receiving sub-assembly with respect to the reflecting device, the light from the light transmitting/receiving sub-assembly is switched between the reflecting strips of the reflecting device.