OPTICAL ELEMENT, LIGHT TRANSMITTING DEVICE, AND LIGHT RECEIVING DEVICE

摘要

An optical element includes: a first delayed interferometer; and a second delayed interferometer and a third delayed interferometer cascaded to the first delayed interferometer. The first delayed interferometer includes: a first optical coupler and a second optical coupler; a first waveguide between the first optical coupler and the second optical coupler; a second waveguide between the first optical coupler and the second optical coupler, the second waveguide being longer than the first waveguide; and a ring waveguide that is coupled to the first waveguide. A difference between a length of the first waveguide and a length of the second waveguide differs from a difference in lengths corresponding to a channel spacing by a length corresponding to a phase displacement caused by loading of the ring waveguide.

主权项

1. An optical element, comprising:
a first delayed interferometer; and a second delayed interferometer and a third delayed interferometer cascaded to the first delayed interferometer, wherein the first delayed interferometer comprises:
a first optical coupler and a second optical coupler;a first waveguide between the first optical coupler and the second optical coupler;a second waveguide between the first optical coupler and the second optical coupler, the second waveguide being longer than the first waveguide; anda ring waveguide that is coupled to the first waveguide, and a difference between a length of the first waveguide and a length of the second waveguide differs from a difference in lengths corresponding to a channel spacing by a length corresponding to a phase displacement caused by loading of the ring waveguide.