Electro-optic device

Patent metadata

Field	Value
Publication number	US-11003044-B2
Application number	US-202016799770-A
Country	US
Kind code	B2
Filing date	Feb 24, 2020
Priority date	Feb 25, 2019
Publication date	May 11, 2021
Grant date	May 11, 2021

Abstract

An electro-optic device is provided with a Mach-Zehnder optical waveguide including at least one linear section and at least one curved section and a differential RF signal electrode provided along the Mach-Zehnder optical waveguide. Optical input/output ports of the Mach-Zehnder optical waveguide are provided at one end side in a first direction in which the linear section extends. The differential RF signal electrode is provided in both the linear and curved sections.

First claim

What is claimed is:

1. An electro-optic device comprising:
a Mach-Zehnder optical waveguide including at least one linear section and at least one curved section; and
a differential RF signal electrode provided along the Mach-Zehnder optical waveguide, wherein
Optical input/output ports of the Mach-Zehnder optical waveguide are provided at one end side in a first direction in which the linear section extends, and
the differential RF signal electrode is provided along both the linear and curved sections and constitutes an interaction part of a Mach-Zehnder modulating element together with the Mach-Zehnder optical waveguide.

2. The electro-optic device as claimed in claim 1 , wherein an RF signal input port of the differential RF signal electrode is provided at the other end side in the first direction.

3. The electro-optic device as claimed in claim 1 , wherein
the Mach-Zehnder optical waveguide includes 1st to (2m+2)th linear sections (m is a positive integer) and 1st to (2m+1)th curved sections, and
the differential RF signal electrode is continuously provided along at least a (2n)th linear section of the Mach-Zehnder optical waveguide (n is a positive integer equal to or less than m), a (2n)th curved section, and a (2n+1)th linear section.

4. The electro-optic device as claimed in claim 3 , wherein
a multiplexer of the Mach-Zehnder optical waveguide is provided at the end portion of a (2m+1)th linear section of the Mach-Zehnder optical waveguide.

5. The electro-optic device as claimed in claim 1 comprising a plurality of the Mach-Zehnder optical waveguides and each of the Mach-Zehnder optical waveguides are provided parallel to one another.

6. The electro-optic device as claimed in claim 5 , wherein a plurality of the curved sections located at a same section in the plurality of the Mach-Zehnder optical waveguides is formed into concentric half circles.

7. The electro-optic device as claimed in claim 1 , wherein a ground electrode is provided neither between two signal electrodes constituting the differential RF signal electrode nor thereoutside.

8. The electro-optic device as claimed in claim 1 , wherein the Mach-Zehnder optical waveguide is a ridge waveguide of a lithium niobate film formed on a substrate.

9. An electro-optic device comprising:
a Mach-Zehnder optical waveguide including at least one linear waveguide section and at least one curved waveguide section; and
a differential RF signal electrode provided along the Mach-Zehnder optical waveguide, wherein
optical input/output ports of the Mach-Zehnder optical waveguide are provided at one end side in a first direction in which the linear waveguide section extends, and
the differential RF signal electrode includes a linear electrode section provided along the linear waveguide section and a curved electrode section provided along the curved waveguide section.

10. The electro-optic device as claimed in claim 9 , wherein an RF signal input port of the differential RF signal electrode is provided at the other end side in the first direction.

11. The electro-optic device as claimed in claim 9 , wherein
the Mach-Zehnder optical waveguide includes 1st to (2m+2)th linear waveguide sections (m is a positive integer) and 1st to (2m+1)th curved waveguide sections, and
the differential RF signal electrode is continuously provided along at least a (2n)th linear waveguide section (n is a positive integer equal to or less than m), a (2n)th curved waveguide section, and a (2n+1)th linear waveguide section.

12. The electro-optic device as claimed in claim 11 , wherein a multiplexer of the Mach-Zehnder optical waveguide is provided at the end portion of a (2m+1)th linear waveguide section of the Mach-Zehnder optical waveguide.

13. The electro-optic device as claimed in claim 9 , further comprising a plurality of the Mach-Zehnder optical waveguides and each of the Mach-Zehnder optical waveguides are provided parallel to one another.

14. The electro-optic device as claimed in claim 13 , wherein a plurality of the curved waveguide sections located at a same section in the plurality of the Mach-Zehnder optical waveguides is formed into concentric half circles.

15. The electro-optic device as claimed in claim 9 , wherein a ground electrode is provided neither between two signal electrodes constituting the differential RF signal electrode nor thereoutside.

16. The electro-optic device as claimed in claim 9 , wherein the Mach-Zehnder optical waveguide is a ridge waveguide of a lithium niobate film formed on a substrate.

Assignees

• Tdk Corp
• Fujitsu Optical Components Ltd

Inventors

• Hara Hiroki
• Iwatsuka Shinji
• Kikukawa Takashi
• Matsuura Toshinori
• Ohmori Yasuhiro
• Doi Masaharu
• Takeuchi Shintaro
• Kubota Yoshinobu

Classifications

• G02F2202/20

  LiNbO3, LiTaO3 · CPC title

• G02F1/0356 Primary

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

• G02F1/212

  Mach-Zehnder type · CPC title

• G02F1/2255 Primary

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

• G02F1/225

  in an optical waveguide structure · CPC title