| 摘要 |
PURPOSE: To propagate a higher-order made light beam in an intermediate waveguide and to produce an optical waveguide with a simple process by providing a first optical waveguide, a second optical waveguide consisting of two lines of optical waveguides and the intermediate optical waveguide to make the propagation losses of light beams small. CONSTITUTION: In this optical waveguide structure, when a light beamλ1 and a light beamλ2 made incident on a first optical waveguide 11 are made incident on an intermediate optical waveguide 13 capable of the propagation of a higher-roder mode, the light beamλ1 and the light beamλ2 are demultiplexed according to characteristics if respective optical wavelengths in the intermediate optical waveguide 13. Since demultiplexed light beamsλ1 ,λ2 are made to be separately emitted from the two lines of optical waveguides of a second optical waveguide 12, this waveguide operates as an optical demultiplexer. Moreover, when light beamλ1 ,λ2 made incident on the two lines of the second optical waveguide 12 are made incident on an intermediate optical waveguide 13 capable of the propagation of the higher-order mode, since the light beamsλ1 ,λ2 are synthesized in the intermediate optical waveguide 13 to be emitted from an exit optical waveguide, this waveguide operates as an optical multiplexer. |
