| 摘要 |
In an acousto-optic filter, a channel type optical waveguide is fabricated on a substrate. First and second surface acoustic wave transducers are mounted on the optical waveguide, respectively, in correspondence with input and output terminals thereof to transduce first and second surface acoustic waves. First and second polarization converters respectively convert only a specific wavelength component of first linearly polarized light excited at the input terminal of the optical waveguide through interaction of the first surface acoustic wave into second linearly polarized light perpendicular to the first linearly polarized light, and only a specific wavelength component of second linearly polarized light obtained by conversion of the first polarization converter through interaction of the second surface acoustic wave generated by the second surface acoustic wave transducer into first linearly polarized light. The first polarization converter has a first interacting region where the first surface acoustic wave and the first linearly polarized light interact. The second polarization converter has a second interacting region, having a length different from the first interacting region, where the second surface acoustic wave and the second linearly polarized light interact.
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