The embodiment of the invention provides an
optical switch. The
optical switch comprises an
optical fiber array, a collimating lens and a reflector, the
optical fiber array comprises a plurality of optical fibers arranged in a matrix; the
fiber core
diameter of the front end part of the
optical fiber is greater than the
fiber core diameters of other parts; the surface of the front end part of theoptical
fiber is defined as a front end surface, and the front end surface is arranged at the front focal plane of the collimating lens; and the reflecting mirror is rotatably arranged on the rear focal plane of the collimating lens. An optical
signal emitted by the optical fiber is focused to the reflector through the collimating lens, and the optical
signal is reflected according to a preset
deflection angle of the reflector and then is incident to another optical fiber through the collimating lens. The optical
fiber array is composed of a plurality of optical fibers, wherein the fiber corediameters of the front ends of the optical fibers are larger than those of other parts. The mode field
radius of the
light spot of the emergent light is enlarged, the
focal length of the collimating lens is increased under the condition that the size of the mirror surface is kept unchanged, the allowable off-
axis distance of the optical fiber on the outermost periphery of the optical
fiber array is increased, and therefore the number of ports of the
optical switch is increased.