OPTICAL WAVEGUIDE MEMBER AND OPTICAL MODULE

摘要

In an optical multiplexer/demultiplexer using a multi−mode optical waveguide, the tolerance of misalignment when mounted is increased. For this, in one aspect, the multi−mode optical waveguide is directly coupled to a single−mode optical waveguide. In another aspect, a single−mode optical waveguide is arranged between them and its length is set to or around zero, or to or around the a period of interference between 0 order mode of the single mode and a radiative high order mode.