| 主权项 |
1. A coherent mixer comprising:
a first multi-mode waveguide that has a first side surface, a second side surface, a first end, and a second end, the first side surface and the second side surface extending in a direction of a first axis, the first end and the second end extending in a direction intersecting with the first axis; a first waveguide group including a plurality of semiconductor regions connected to the first end; a first semiconductor region that has a side surface extending substantially parallel to the first side surface of the first multi-mode waveguide; and a first external semiconductor region that is provided on an external side of the first waveguide group, the first external semiconductor region having a side surface extending substantially parallel to an edge of the first waveguide group, wherein the side surface of the first semiconductor region is spaced apart from the first side surface of the first multi-mode waveguide by a distance smaller than or equal to a reference value, the side surface of the first external semiconductor region is spaced apart from the edge of the first waveguide group by a distance smaller than or equal to the reference value, and the reference value is a maximum value of distances between arbitrary adjacent semiconductor regions in the first waveguide group. |
