US 12,066,737 B2
Optical device and optical transceiver
Masaki Sugiyama, Kawasaki (JP)
Assigned to FUJITSU OPTICAL COMPONENTS LIMITED, Kawasaki (JP)
Filed by Fujitsu Optical Components Limited, Kawasaki (JP)
Filed on Feb. 2, 2022, as Appl. No. 17/591,395.
Claims priority of application No. 2021-039733 (JP), filed on Mar. 11, 2021.
Prior Publication US 2022/0291567 A1, Sep. 15, 2022
Int. Cl. G02F 1/225 (2006.01); G02F 1/01 (2006.01); G02F 1/21 (2006.01); H04B 10/40 (2013.01)
CPC G02F 1/2255 (2013.01) [G02F 1/0147 (2013.01); G02F 1/212 (2021.01); H04B 10/40 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An optical device comprising:
a substrate in which a first buffer layer, a thin film having an electro-optic effect and including a second optical waveguide, and a second buffer layer are formed in this order;
a RF modulating unit that is provided on the substrate and that modulates light propagating through the second optical waveguide in accordance with a RF signal, the second optical waveguide having an electro-optic effect; and
a phase adjustment unit that is provided on the substrate and that adjusts a phase of an optical signal modulated by the RF modulating unit, wherein
the phase adjustment unit includes
a first optical waveguide that is provided between the second buffer layer and the thin film, that is formed of a material having a thermo-optical effect, and through which light that has been modulated or that is to be modulated by the RF modulating unit is allowed to pass, and
a heater that is provided at a position opposite the first optical waveguide, with the second buffer layer therebetween, and that heats the first optical waveguide.