Optical control device

Patent metadata

Field	Value
Publication number	US-9568751-B2
Application number	US-201113876811-A
Country	US
Kind code	B2
Filing date	Sep 29, 2011
Priority date	Sep 30, 2010
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

An optical control device is provided which can suppress crosstalk between electrodes without increasing the entire size of the device itself. The optical control device includes a substrate having an electro-optical effect, an optical waveguide formed in the substrate, and a modulation electrode modulating optical waves propagating in the optical waveguide. The modulation electrode includes at least two signal electrodes and ground electrodes arranged to interpose the signal electrodes therebetween. The optical control device further includes an electrical connection member that electrically connects the ground electrode disposed between the two signal electrodes to other ground electrodes and that is disposed to cross over part of the signal electrode.

First claim

What is claimed is:

1. An optical control device comprising:
a substrate having an electro-optical effect;
an optical waveguide formed in the substrate; and
a modulation electrode modulating optical waves propagating in the optical waveguide, wherein
the optical waveguide is a nested type optical waveguide in which a first sub Mach-Zehnder type optical waveguide and a second sub Mach-Zehnder type optical waveguide are inserted into a main Mach-Zehnder type optical waveguide in an embedded form,
the modulation electrode comprises ground electrodes and at least two separate signal electrodes,
at least a first one of the separate signal electrodes is arranged to modulate optical waves propagating in the first sub Mach-Zehnder type optical waveguide,
the ground electrodes include a first ground electrode and a second ground electrode with the first sub Mach-Zehnder type optical waveguide interposed therebetween,
the second ground electrode is arranged to be interposed between the first sub Mach-Zehnder type optical waveguide and the second sub Mach-Zehnder type optical waveguide,
a first electrical connection member electrically connects the first ground electrode to the second ground electrode, and
the first electrical connection member is disposed to cross over the first sub Mach-Zehnder type optical waveguide and said first separate signal electrode that modulates optical waves propagating in the first sub Mach-Zehnder type optical waveguide,
at least a second one of the separate signal electrodes is arranged to modulate optical waves propagating in the second sub Mach-Zehnder type optical waveguide,
the ground electrodes further comprise a third ground electrode, and the second sub Mach-Zehnder type optical waveguide is interposed between the second ground electrode and the third ground electrode,
a second electrical connection member electrically connects the second ground electrode to the third ground electrode, and the second electrical connection member is disposed to cross over the second sub Mach-Zehnder type optical waveguide and said second separate signal electrode that modulates optical waves propagating in the second sub Mach-Zehnder type optical waveguide,
at least one of the first electrical connection member and the second electrical connection member is comprised of a plurality of conductive members formed of conductive wire or conductive ribbon, and
a gap between the conductive members is set to a half wavelength or less of a modulating electrical signal propagating in the signal electrode over which the conductive members cross.

Assignees

• Kanno Shinsuke
• Shimizu Ryo
• Sumitomo Osaka Cement Co Ltd

Inventors

• Kanno Shinsuke
• Shimizu Ryo

Classifications

• G02F1/035 Primary

  in an optical waveguide structure · CPC title

• G02F2201/121

  common or background · CPC title

• G02F1/0356

  controlled by a high-frequency electromagnetic wave component in an electric waveguide structure · CPC title