| 摘要 |
A wavelength tunable optical filter ( 1 ) comprises a dielectric crystal portion ( 2 ) comprised of a dielectric crystal having a cubic system and exhibiting a quadratic electro-optic effect, a mirror portion ( 5, 6 ) constituting a Fabry-Perot etalon in cooperation with said dielectric crystal portion, and an electrode ( 3, 4 ) configured to apply a voltage to said dielectric crystal portion thereby to change a wavelength of light transmitting through said etalon on a basis of said electro-optic effect. According to the configuration, since the dielectric crystal having a cubic system and exhibiting a quadratic electro-optic effect is used, there is provided a wavelength tunable optical filter that is capable of operating at high-speed on application of a low voltage.
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