| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-mode interference optical coupler of a non-equally branched type with a simple structure to make its layout easy. SOLUTION: An area (refractive index changing part) 15 which is nearly perpendicular to the travel direction of light, equal in width, and different in refractive index is provided at a position where the light intensity of an area 16 is converged and between areas 16 and 17 of a multi-mode optical waveguide 13 arranged between input optical waveguides 12a and 12b and output optical waveguides 14a and 14b and thus a Mach-Zehnder type interferometer or extended Mach-Zehnder interferometer is equivalently constituted to realize an arbitrary branching ratio. COPYRIGHT: (C)2004,JPO |
