| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical waveguide and a semiconductor optical integrated element having a ridge waveguide and a high mesa waveguide on a common substrate, in which reflection of light generated in the boundary between the ridge waveguide and the high mesa waveguide is reduced. <P>SOLUTION: A semiconductor optical integrated element comprises: a lower clad layer; a first core layer formed in an upper layer of a part of the lower clad layer, for emitting light; a second core layer formed in an upper layer of the lower clad layer and a region in which the first core layer is not formed, for absorbing light; and an upper clad layer formed so as to overlap with an upper layer of the first core layer and the second core layer. The second core layer has a refractive index lower than that of the first core layer. The second core layer comprises: a gradually decreasing portion in which a width of the second core layer in a direction parallel to a contact surface with the first core layer is gradually decreased to a predetermined width in a direction separating from the contact surface; and a stripe portion in contact with a portion of the gradually decreasing portion having the predetermined width, and linearly formed at the predetermined width. <P>COPYRIGHT: (C)2012,JPO&INPIT |
