Optical waveguide device with reinforcement member for optical fiber and waveguide portion

Patent metadata

Field	Value
Publication number	US-11500264-B2
Application number	US-202117399625-A
Country	US
Kind code	B2
Filing date	Aug 11, 2021
Priority date	Jul 24, 2018
Publication date	Nov 15, 2022
Grant date	Nov 15, 2022

Abstract

An optical waveguide device includes a substrate on which an optical waveguide is formed, and an object that is disposed on the substrate. The optical waveguide includes a mode conversion/branching portion that converts a mode of a light wave propagating through the optical waveguide and branches the light wave, and the object is disposed to cover a part or the whole of the mode conversion/branching portion or not to cover the mode conversion/branching portion when the substrate is viewed in a plan view. In a case where the object is disposed to cover a part of the mode conversion/branching portion, the object is disposed not to consecutively cover a section over a length of a predetermined value or higher in an advancing direction of a light wave.

First claim

What is claimed is:

1. An optical waveguide device comprising:
a substrate on which an optical waveguide is formed; and
a reinforcing member that is disposed on the substrate to reinforce connection between an optical fiber through which a light wave is input to the optical waveguide and the substrate,
wherein the optical waveguide includes a first portion that converts a mode of light wave propagating through the optical waveguide and branches the light wave, and
wherein the reinforcing member is disposed to cover the whole of the first portion when the substrate is viewed in a plan view.

2. The optical waveguide device according to claim 1 ,
wherein the optical waveguide includes a second portion that converts a mode of a light wave branched by the first portion and further branches the light wave, and
wherein an electrode controlling a light wave propagating through the optical waveguide is disposed not to cover the second portion at all when the substrate is viewed in a plan view.

3. The optical waveguide device according to claim 1 ,
wherein the optical waveguide includes a second portion that converts a mode of a light wave branched by the first portion and further branches the light wave, and
wherein an electrode controlling a light wave propagating through the optical waveguide is disposed to cover the whole of the second portion when the substrate is viewed in a plan view.

4. The optical waveguide device according to claim 1 ,
wherein the first portion has a mode conversion part and a branching part wherein the optical waveguide is split into two branched waveguides, and
the mode conversion part has a tapered shape of which a width of the optical waveguide gradually increases toward the branching part.

5. The optical waveguide device according to claim 4 ,
wherein the width of an end of the branching part comprising the two branched waveguides is three times or less than the width of the optical waveguide adjacent to the mode conversion part.

6. The optical waveguide device according to claim 1 ,
wherein the reinforcing member has a different Young's modulus from that of the substrate.

Assignees

• Sumitomo Osaka Cement Co Ltd

Inventors

• Katou Kei
• Miyazaki Norikazu

Classifications

• G02B6/10 Primary

  of the optical waveguide type (G02B6/02, G02B6/24 take precedence; devices or arrangements for the control of light by electric, magnetic, electro-magnetic or acoustic means G02F1/00; transferring the modulation of modulated light G02F2/00; optical logic elements G02F3/00; optical analogue/digital converters G02F7/00) · CPC title

• G02B6/14

  Mode converters · CPC title

• G02F1/3137

  with intersecting or branching waveguides, e.g. X-switches and Y-junctions · CPC title

• G02F1/225 Primary

  in an optical waveguide structure · CPC title

• G02F1/212

  Mach-Zehnder type · CPC title