disclosed is an optical switch enabling to be advantageous in cost , performance , size , weight , and fabricating process as well as carry out a switching function with a low driving voltage . the present invention includes a substrate , an input optical fiber over the substrate for incidence of an optical signal , at least one output optical fiber over the substrate for projection of the optical signal , and a micro - prism over the substrate for switching a projection path of the optical signal incident on the input optical fiber .