| 摘要 |
PURPOSE:To manufacture an optical circuit with a high yield and to make it short in size by cutting off one side optical waveguide between two pieces of optical waveguides forming the directional coupler for a guided light of a long wavelength. CONSTITUTION:A directional coupler optical waveguide 4a being one of directional coupler optical waveguides 4a, 4b is connected to introduced light waveguides 2a where two wavelengths are inputted/outputted. Another directional coupler optical waveguide 4b arranged adjacently to the directional coupler optical waveguide 4a is cut off for the waveguided light of the long wavelength. Then, the guided light of the long wavelength passes through the directional coupler without coupling with the other optical waveguide. On the other hand, the directional coupler is set so as to become a perfect connection length for the guided light of a short wavelength. Then, the guided light of the short wavelength is coupled with the other optical waveguide in the directional coupler, and power is perfect shifted. Thus, two wavelengths are multiplexed/ demultiplexed. |
