| 摘要 |
PROBLEM TO BE SOLVED: To provide a multimode interference optical coupler which is capable of increasing an allowable width error while keeping an overall length short. SOLUTION: The multimode interference optical coupler 100 includes the first input/output optical waveguides 110 and 120, at least two second input/output optical waveguides 140 and 150 adjacent to each other, and a multimode optical waveguide 130 provided between the first input/output optical waveguides 110 and 120 and the second input/output optical waveguides 140 and 150 and for propagating multimode guided wave. The multimode optical waveguide 130 included in the multimode interference optical couple 100 includes a first multimode optical waveguide part 131 having the first input/output optical waveguides 110 and 120 connected thereto and a second multimode optical waveguide part 132 which has the second input/output optical waveguides 140 and 150 connected thereto and has a width narrower than that of the first multimode optical waveguide part 131 in a direction perpendicular to the propagation direction of the multimode guided wave. COPYRIGHT: (C)2009,JPO&INPIT |
