Optical-waveguide-element module

Patent metadata

Field	Value
Publication number	US-10126573-B2
Application number	US-201515126747-A
Country	US
Kind code	B2
Filing date	Jan 7, 2015
Priority date	Mar 31, 2014
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

Provided is an optical-waveguide-element module in which a common connecting substrate is used for different optical waveguide elements and deterioration of the propagation characteristics of electrical signals in a curved section of a signal electrode is suppressed. A control electrode in an optical waveguide element is consisted of a signal electrode SL and ground electrodes GD which put the signal electrode therebetween, a connecting substrate is provided with a signal line SL1 (SL2) and ground lines GD1 (GD2) which put the signal line therebetween, the signal electrode and the signal line, and, the ground electrodes and the ground lines are respectively connected to each other using wires (WR1, WR2, and WR20 to WR22), the control electrode in which a space W1 between the ground electrodes GD at an input end or an output end of the control electrode is wider than a space W2 between the ground lines GD1 (GD2) on the optical waveguide element side in the connecting substrate, has a portion in which the space between the ground electrodes GD forms a space W3 which is narrower than the space W2 in a portion away from the input end or the output end, furthermore, the signal electrode SL in the control electrode has a curved section in a place from the input end or the output end to an operating part in which the control electrode applies an electric field to the optical waveguide, and suppression means (WR20 to WR32) for suppressing generation of a local potential difference between the ground electrodes which put the signal electrode therebetween in the curved section of the signal electrode is provided.

First claim

The invention claimed is:

1. An optical waveguide element module comprising:
an optical waveguide element including a substrate having an electro-optic effect, an optical waveguide formed in the substrate, and a control electrode for controlling light waves that propagate through the optical waveguide; and
a connecting substrate which is provided outside the optical waveguide element and has a wire electrically connected to the control electrode,
the optical waveguide element and the connecting substrate being housed in a case,
wherein the control electrode comprises a signal electrode and ground electrodes having the signal electrode therebetween,
the connecting substrate is provided with a signal line and ground lines having the signal line therebetween,
the signal electrode and the signal line, and, the ground electrodes and the ground lines, are respectively connected each other using wires,
the control electrode in which a space W 1 between the ground electrodes at an input end or an output end in the control electrode is wider than a space W 2 between the ground lines at the optical waveguide element side of the connecting substrate, has a portion in which the space between the ground electrodes forms a space W 3 which is narrower than the space W 2 in a portion away from the input end or the output end,
the signal electrode in the control electrode has a curved section in a place from the input end or the output end to an operating part in which the control electrode applies an electric field to the optical waveguide,
suppression means for suppressing generation of a local potential difference between the ground electrodes having the signal electrode therebetween in the curved section of the signal electrode are provided, and
the suppression means are innermost wires connecting the ground electrodes and the ground lines, a length of one of the innermost wires connected to the ground electrode having a longer length of the ground electrode along the signal electrode in a place from the input end or the output end to the operating part is set to be longer than a length of the other innermost wire connected to the ground electrode having a shorter length, and said one of the innermost wires is disposed closer to the signal electrode than the other innermost wire in the curved section of the signal electrode.

2. The optical-waveguide-element module according to claim 1 ,
wherein the suppression means has no wire connecting the ground electrodes having the curved section of the signal electrode therebetween.

3. The optical-waveguide-element module according to claim 1 ,
wherein the suppression means have a plurality of wires connecting the ground electrodes having the curved section of the signal electrode therebetween, the respective wires connecting the ground electrodes are disposed in a normal direction to the curved section of the signal electrode, and said one of the innermost wires does not extend across the wires connecting the ground electrodes.

Assignees

• Sumitomo Osaka Cement Co Ltd
• Sumitomo Osaka Cement Co Ltd

Inventors

• Miyazaki Norikazu

Classifications

• G02F2201/12

  electrode · CPC title

• G02F2201/127

  travelling wave · CPC title

• G02F1/2255

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

• G02F2001/212

  Physics · mapped topic

• G02F1/0316

  Electrodes · CPC title