Patent ID: 7379635

Claim:
An optical switch comprising, a support part supporting end parts, mutually lined up in parallel on a substrate, of three optical waveguide parts; a first and a second moving mirror capable of varying relative positions with respect to said substrate; and a first and a second fixed mirror having fixed relative positions with respect to said substrate; wherein the end part of the center optical waveguide part of the three optical waveguide parts supported by said support part is one input port; the end parts of the two other optical waveguide parts, adjacent on both sides of said center optical waveguide part, are respectively a first output port and a second output port; said first moving mirror and said second moving mirror are respectively capable of insertion into insertion positions, said insertion positions are on optical paths of emitted light from said input port to said first and second output ports, and distances on the optical paths from said input port to said insertion positions are the same; it is capable of switching between a state in which only said first moving mirror is inserted into one of said insertion positions and a state in which only said second moving mirror is inserted into one of said insertion positions; the emitted light from said input port is reflected, by said first moving mirror or said second moving mirror which are respectively inserted into one of said insertion positions, respectively to side of said first output port or to side of said second output port; the light reflected by said first moving mirror to the side of said first output port is further reflected by said first fixed mirror and coupled to said first output port in parallel with, and in a reverse direction from, the emitted light from said input port; the light reflected by said second moving mirror to the side of said second output port is further reflected by said second fixed mirror and coupled to said second output port in parallel with, and in a reverse direction from, the emitted light from said input port; and the optical path from said first moving mirror to said first output port via said first fixed mirror and the optical path from said second moving mirror to said second output port via said second fixed mirror are symmetric with respect to an axis of the emitted light of said input port.