Optical selector switch and signal-processing apparatus

An optical selector switch comprising:

• an optical waveguide that includes a first optical waveguide portion having a first light-transmissivity, a second optical waveguide portion having a second light-transmissivity and being provided over a whole side surface of the first optical waveguide portion, reflecting members that reflect light and are positioned on both upper and lower surfaces of the first optical waveguide portion and the second optical waveguide portion so as to be opposed to each other with the reflecting members exposing an outer circumference of the second optical waveguide portion, and a light-dividing device that reflects a predetermined ratio of the light and transmits the remains thereof, the light-dividing device being positioned at a boundary of the first and second optical waveguide portions;
• at least one light-emitting unit that emits the light toward the first optical waveguide portion of the optical waveguide, the light-emitting unit being positioned with a predetermined angle along the outer circumference of the second optical waveguide portion of the optical waveguide;
• and
• at least one light-receiving unit that receives the light which is incident to the first optical waveguide portion of the optical waveguide from the light-emitting unit, the light-receiving unit being positioned with a predetermined angle along the outer circumference of the second optical waveguide portion of the optical waveguide, based on a directivity due to an angle of the incident light to the first optical waveguide portion of the optical waveguide,
• wherein the incident light to the first optical waveguide portion of the optical waveguide from a single angle or separate angles is emitted radially toward the circumference of the second optical waveguide portion of the optical waveguide with the incident light having at least one of directivity.