| 摘要 |
PURPOSE:To provide a compact and low loss optical multiplexer/demultiplexer easy in manufacturing. CONSTITUTION:In a multi-input-output type optical multiplexer/demultiplexer having a first optical waveguide 11 with a structure to confine light in both the up-down and left-right directions and a two-dimensional transmission region 12 without a light confinement region in the left-right direction, a multi-mode waveguide region 13 with a structure to confine the light in both the up-down and left-right directions and a wide width is coupled to the two-dimensional transmission region, total reflection mirrors 18a-18g are formed, spanning over the waveguide direction, in a side wall of the is multi-mode waveguide region 13, while crossing with a part of the side wall in the width direction, and branched waveguides 19a-19g through which reflected light from the total reflection mirrors 18a-18g are combined with each other are provided in an opposite side wall. |
