| 摘要 |
In order to provide a high performance optical mixer having good yield, an optical mixer comprises: a first light branching means that branches a first input light into a plurality of first lights including a first output light and a second output light, and outputs the first lights; a second light branching means that branches a second input light into a plurality of second lights including a third output light and a fourth output light, and outputs the second lights; and a first light coupling and branching means and a second light coupling and branching means that couple the first and the third output lights and the second and the fourth output lights respectively, and branching the coupled lights into at least two, and outputting each of the branched lights as a coupled-and-branched light, wherein propagation paths for the third and the fourth output lights comprise widths that cause a prescribed optical path length difference to occur between the third and the fourth output lights, and propagation path lengths for the first and the second output lights are approximately equal and propagation path lengths for the third and the fourth output lights are approximately equal. |
