| 摘要 |
An optical semiconductor device in which a combination of materials of different refractive indices and temperature dependences of the refractive indices is used and an optical integrated circuit are disclosed. Especially, the temperature dependence of the oscillation wavelength can be controlled by a propagation region having a material and/or structure different in the temperature dependence of refractive index from that of the gain region of a semiconductor laser. An optical waveguide can have a structure in which interfaces are formed along the light guiding direction, and light reflected from a first interface is weakened by the light reflected from other interfaces. Further, by disposing the interfaces at angles with respect to the light propagation direction, the waveguide loss due to reflection and refraction between optical waveguides of different refractive indices can be reduced.
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