Optical device and optical communication apparatus
AssigneeFujitsu Optical Components Limited
InventorsYoshihiko Yoshida, Nobuaki Mitamura, Shuntaro Makino, Yoshinobu Kubota
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Abstract
An optical device includes a silicon substrate, a waveguide formed of a thin film that is laminated on the silicon substrate and that is made of a perovskite oxide with a large electro-optic effect as compared to lithium niobate, and a cladding layer that covers the waveguide. Further, the optical device includes ground electrode that has a ground potential and a signal electrode that is arranged at a position facing the ground electrode and that applies driving voltage to the waveguide.
Claims19
An optical device comprising:
- a silicon substrate;
- a ground electrode that is laminated on the silicon substrate and that has a grounding potential;
- a first cladding layer that is laminated on the ground electrode;
- a waveguide formed of a thin film that is laminated on the first cladding layer and that is made of a perovskite oxide with larger electro-optic effect than lithium niobate;
- a second cladding layer that covers the waveguide;
- and
- a signal electrode that is laminated on the second cladding layer and arranged at a position facing the ground electrode across the waveguide and that applies driving voltage to the waveguide.
An optical device comprising:
- a silicon substrate;
- a first cladding layer that is laminated on the silicon substrate;
- a lanthanum-doped lead zirconate-lead titanate (PLZT) waveguide as a waveguide formed of a thin-film PLZT as a thin film that is laminated on the first cladding layer and that is made of a perovskite oxide;
- a second cladding layer that covers the PLZT waveguide;
- a signal electrode that is arranged on the second cladding layer and that applies the driving voltage to the PLZT waveguide;
- and a pair of ground electrodes that are arranged on the second cladding layer so as to sandwich the signal electrode, wherein a crystal direction of the PLZT waveguide is same as a direction of an electric field generated from the signal electrode to the pair of ground electrodes, wherein the signal electrode and the ground electrodes are arranged on opening portions that are formed on the second cladding layer positioned at lateral sides of the PLZT waveguide.
An optical communication apparatus comprising:
- a processor that performs signal processing on an electrical signal;
- a light source that generates light;
- and
- an optical device that modulates the light generated from the light source by using an electric field output from the processor, wherein
- the optical device includes
- a ground electrode that is laminated on a silicon substrate and that has a grounding potential;
- a first cladding layer that is laminated on the ground electrode;
- a waveguide formed of a thin film that is laminated on first cladding layer and that is made of a perovskite oxide with larger electro-optic effect than lithium niobate;
- a second cladding layer that covers the waveguide;
- a signal electrode that is laminated on the second cladding layer and arranged at a position facing the ground electrode across the waveguide and that applies driving voltage to the waveguide.
Dependencies are inferred from the claim text.