| 摘要 |
<P>PROBLEM TO BE SOLVED: To maintain light transmission of light with a wavelength of 1.49 μm in a practically sufficient level, and suppress sufficiently light transmission of light with a wavelength in a vicinity of 1.30 μm, by significantly reducing a Bragg peak. <P>SOLUTION: An optical element includes a clad 12 formed on a primary side 8a of a substrate 8, and a light waveguide 11 arranged in the clad and composed of a core 18. The light waveguide is formed by connecting a wide width part 14a having a first width and a narrow width part 14b having a second width in series along a light propagation direction. The optical element further includes a grating 14 formed by connecting in series n stages of units U with a length as a first period. The first period of the grating is configured to radiate first light of a first wavelength to the clad and transmit second light of a second wavelength which is longer than the first wavelength, the first and second light being input to the grating. <P>COPYRIGHT: (C)2013,JPO&INPIT |
