US 11,892,716 B2
Optical device and optical transceiver using the same
Masaki Sugiyama, Kawasaki (JP)
Assigned to FUJITSU OPTICAL COMPONENTS LIMITED, Kawasaki (JP)
Filed by Fujitsu Optical Components Limited, Kawasaki (JP)
Filed on Jan. 4, 2022, as Appl. No. 17/568,261.
Claims priority of application No. 2021-020434 (JP), filed on Feb. 12, 2021.
Prior Publication US 2022/0260866 A1, Aug. 18, 2022
Int. Cl. G02F 1/035 (2006.01); G02B 6/12 (2006.01); G02B 6/13 (2006.01)
CPC G02F 1/035 (2013.01) [G02B 6/13 (2013.01); G02B 2006/1204 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An optical device comprising:
a substrate;
a layered structure provided on the substrate, the layered structure including an intermediate layer, an optical waveguide formed of a thin crystal film having an electro-optic effect, and a buffer layer stacked in this order; and
an electrode provided on or above the buffer layer and configured to apply a direct current voltage to the optical waveguide,
wherein a resistivity of the intermediate layer is higher than a resistivity of the buffer layer, and the resistivity of the buffer layer is lower than a resistivity of the optical waveguide formed of the thin crystal film.