Patent ID: 6766080
Filing Date: 2004-07-20
Classification: G02B

Abstract:
An optical waveguide type filter provided with a periodically perturbation part in a part of an optical waveguide in a longitudinal direction thereof; wherein a line perpendicular to a level plane of said periodically perturbation part is tilted with respect to an optical axis of said optical waveguide; and wherein, when said optical waveguide is made linear without twisting, said optical waveguide includes a portion where a plane formed by a line passing a given point on said optical axis in said periodically perturbation part and being perpendicular to a level plane passing said given point and said optical axis varies depending on a position of said given point in the longitudinal direction thereof,wherein said plane has a part rotated about the optical axis with respect to the longitudinal direction of the optical waveguide.