| 摘要 |
Provided is a mode converter capable of efficiently coupling or emitting light having a single-peaked spot, and has high flexibility of the shape to be easily manufactured. The mode converter is formed of multiple single-mode waveguides optically coupling areas 1 and 2; when an axis parallel to a light propagation direction is z axis, an axis perpendicular to the z axis in a direction crossing the single-mode waveguides is x axis, an axis perpendicular to the x and z axes is y axis, and a plane passing through a center of the mode converter and includes the z axis is plane 1, the multiple single-mode waveguides are arranged reflection-symmetrically with respect to the plane 1; and the mode converter converts light entering from the area 1 into the even mode to cause the light of the even mode to propagate and couple optically with the area 2. |
