Patent 7136553 was granted and assigned to Electronics and Telecommunications Research Institute on November, 2006 by the United States Patent and Trademark Office.
Provided are a tunable demultiplexer and a tunable laser, having an optical deflector in which a refractive index of a core layer of a deflection pattern region having a predetermined shape varies in response to an external electrical signal so that the optical deflector deflects incident light in the radial direction.