| 摘要 |
PURPOSE:To provide the method for arranging the taper mirror at a suitable position for a desired optical path change in an optical waveguide. CONSTITUTION:A virtual vertical reflecting surface cdd'c' which reflects incident light, passing an optional point O1 in the waveguide layer 3 of a slab type optical waveguide, at a reflection point P0 on a reflecting surface at an angle theta2 of reflection and guides the light to an optional point O2 in the waveguide 3 is considered, and the taper mirror is arranged so that the shoulder section egg'e' of the taper mirror is arranged horizontally opposite the virtual vertical reflecting surface at a distance of a position correction quantity DELTAZ and the taper end ff' of the taper mirror is arranged more on the virtual vertical reflecting surface side than the shoulder section; incident light Rlinc which is incident on an incidence point P1 on the shoulder part section of the taper mirror at an angle theta3 of incidence equal to the angle theta2 of reflection and a projection point P2 of the incident light on the taper mirror shoulder part section are defined and when the position shift quantity of the projection point P2 from the incidence point P1 is denoted as DELTAY, the position correction quantity DELTAZ is represented as DELTAY/(2Xtantheta2). |
