| 摘要 |
A semiconductor integrated circuit which has a wavelength converting function and a wavelength demultiplexing function is made up of a relatively small number of parts, allows parts to be integrated easily, and can be manufactured at a relatively low cost. The semiconductor integrated circuit includes an MMI waveguide for converting an optical signal having a second wavelength into an optical signal having a first wavelength, a first input port mounted on an entrance end of the MMI waveguide, for being supplied with the optical signal having the first wavelength, a second input port for being supplied with the optical signal having the second wavelength, and at least one output port mounted on an exit end of the MMI waveguide, for extracting the optical signal having the first wavelength. The MMI waveguide has a refractive index variable depending on the intensity of the optical signal having the second wavelength.
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