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US 8,559,777 B2Granted
Optical device and optical modulation apparatus
AssigneeAdvantest Corporation
InventorsHideo Hara, Shin Masuda, Atsushi Seki
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AssigneeAdvantest Corporation
InventorsHideo Hara, Shin Masuda, Atsushi Seki
Estimating the term…
Provided is an optical modulator that modulates input light with a high frequency and low half-wave voltage. An optical device comprises a substrate; a dielectric film that is formed on the substrate and includes a first optical waveguide and a second optical waveguide that run parallel to each other; an insulating film formed on the dielectric film; a coplanar line that is formed on the insulating film and includes a signal line arranged between the first optical waveguide and the second optical waveguide, a first ground line arranged in a first region, and a second ground line arranged in a second region; and auxiliary electrodes that are arranged in the first region and the second region, are formed in contact with the dielectric film or within the insulating film, and apply bias voltages to the first optical waveguide and the second optical waveguide.
An optical device comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
In an optical waveguide structure: controlled by a high-frequency electromagnetic component in an electric waveguide structure
For the control of the intensity, phase, polarisation or colour: operation of devices; Circuit arrangements, not otherwise provided for in this…
Constructional arrangements: electrodes
Optical devices or arrangements for the control of light by modification of
About 5 years of term left · ends 20 Oct 2031 (estimated)
1. Technical Field
The present invention relates to an optical device and an optical modulation apparatus.
2. Related Art
FIG. 1 shows an exemplary configuration of an optical device section 100 according to the present embodiment, along with a drive circuit section 200.
FIG. 2 shows a cross section over the line A-A′ in FIG. 1, along with the drive circuit section 200.
FIG. 3 shows exemplary change in the refractive index with respect to the applied electric field of the dielectric film 20 according to the present embodiment.
Hereinafter, some embodiments of the present invention will be described. The embodiments do not limit the invention according to the claims, and all the combinations of the features described in the embodiments are not necessarily essential to means provided by aspects of the invention.
FIG. 1 shows an exemplary configuration of an optical device section 100 according to the present embodiment, along with a drive circuit section 200. The optical device section 100 includes a Mach-Zehnder optical waveguide formed by a ferroelectric crystal, a coplanar electrode that has a signal line and two bias applying electrodes sandwiching the signal line, and an insulating film formed between the dielectric film and the coplanar electrode. The optical device section 100 efficiently applies a modulated electric field to the Mach-Zehnder optical waveguide using auxiliary electrodes that are formed within the insulating film or on a ferroelectric thin film.
The optical device section 100 includes a first optical waveguide 110, a second optical waveguide 120, a signal line 130, a first ground line 132, a second ground line 134, a first photocoupler 140, a second photocoupler 142, a first auxiliary electrode 150, a second auxiliary electrode 152, a first external electrode 160, and a second external electrode 162.