Optical connecting structure

Patent metadata

Field	Value
Publication number	US-12153258-B2
Application number	US-202017431876-A
Country	US
Kind code	B2
Filing date	Apr 2, 2020
Priority date	Apr 15, 2019
Publication date	Nov 26, 2024
Grant date	Nov 26, 2024

Abstract

An optical connection structure includes a waveguide substrate; a Si waveguide formed on one surface of the waveguide substrate 100 and having a first end surface; an optical fiber having a second end surface facing the first end surface; a terrace section extending further toward the optical fiber side from an end portion on the optical fiber side of the waveguide substrate; and a support member formed on the terrace section, and including, on a top surface in a view from the terrace section, a recess c configured to support a lens.

First claim

The invention claimed is:

1. An optical connection structure comprising:
a substrate including an end surface;
a first waveguide on a first surface of the substrate, the first waveguide including an end surface;
a block over and contacting an upper surface of the first waveguide;
a second waveguide including an end surface facing the end surface of the first waveguide and facing an end surface of the block, wherein a lengthwise dimension of the first waveguide and a lengthwise dimension of the second waveguide each extend along a first direction;
a terrace extending toward the second waveguide from the end surface of the substrate, the end surface of the substrate facing the second waveguide;
a support member on the terrace, wherein a top surface of the support member includes a recess supporting an optical element, and wherein a lengthwise dimension of the recess extends along a second direction perpendicular to the first direction; and
a filler disposed between the first waveguide and the second waveguide, disposed between the block and the second waveguide, and covering the support member and the optical element, wherein the filler extends continuously from the end surface of the block to the end surface of the second waveguide, and wherein the filler is made of a resin material having a refractive index smaller than a refractive index of the optical element.

2. The optical connection structure according to claim 1 , wherein the recess is configured to engage with part of the optical element.

3. The optical connection structure according to claim 2 , further comprising:
an adhesive configured to bond the optical element to the support member.

4. The optical connection structure according to claim 2 , wherein the recess corresponds to a shape and a size of a part of the optical element that the recess is configured to engage with.

5. The optical connection structure according to claim 2 , wherein the recess has a curved shape.

6. The optical connection structure according to claim 2 , further comprising:
a connection layer that is formed of a material having a refractive index smaller than a refractive index of the optical element, wherein the connection layer covers the support member and the optical element between the end surface of the first waveguide and the end surface of the second waveguide.

7. The optical connection structure according to claim 2 , wherein the support member is constituted of a light cured resin material.

8. The optical connection structure according to claim 2 , further comprising a second support member on the terrace, wherein a second top surface of the second support member includes a second recess configured to support a second optical element.

9. A method comprising:
providing an optical connection structure, the optical connection structure comprising:
a substrate including an end surface;
a first waveguide on a first surface of the substrate, the first waveguide including an end surface;
a block over and contacting an upper surface of the first waveguide;
a second waveguide including an end surface facing the end surface of the first waveguide and facing an end surface of the block, wherein a lengthwise dimension of the first waveguide and a lengthwise dimension of the second waveguide each extend along a first direction;
a terrace extending toward the second waveguide from the end surface of the substrate, the end surface of the substrate facing the second waveguide; and
a support member on the terrace, wherein a top surface of the support member includes a recess;

supporting, by the recess, an optical element, and wherein a lengthwise dimension of the recess extends along a second direction perpendicular to the first direction; and
forming a filler between the first waveguide and the second waveguide, between the block and the second waveguide, and covering the support member and the optical element, wherein the filler extends continuously from the end surface of the block to the end surface of the second waveguide, and wherein the filler is made of a resin material having a refractive index smaller than a refractive index of the optical element.

10. The method according to claim 9 , further comprising:
bonding, with an adhesive, the optical element to the support member.

11. The method according to claim 9 , further comprising:
covering, with a connection layer the support member and the optical element between the end surface of the first waveguide and the end surface of the second waveguide, wherein the connection layer is formed of a material having a refractive index smaller than a refractive index of the optical element.

12. The method according to claim 9 , wherein the support member is constituted of a light cured resin material.

13. The method according to claim 9 , wherein the optical connection structure further comprises a second support member on the terrace, wherein a second top surface of the second support member includes a second recess configured to support a second optical element.

14. The method according to claim 9 , wherein the optical element is a lens.

15. The method according to claim 9 , wherein an end face of the terrace faces a clad of the second waveguide, and wherein the end face of the terrace is adhered to the clad of the second waveguide by an adhesive that extends continuously from the end face of the terrace to an end face of the clad of the second waveguide.

16. The method according to claim 11 , wherein a top surface of the connection layer is level with top surfaces of the first waveguide and the second waveguide.

17. The optical connection structure according to claim 1 , wherein the optical element is a lens.

18. The optical connection structure according to claim 1 , wherein an end face of the terrace faces a clad of the second waveguide, and wherein the end face of the terrace is adhered to the clad of the second waveguide by an adhesive that extends continuously from the end face of the terrace to an end face of the clad of the second waveguide.

19. The optical connection structure according to claim 6 , wherein a top surface of the connection layer is level with top surfaces of the first waveguide and the second waveguide.

Assignees

• Nippon Telegraph & Telephone

Inventors

• Endo Jun
• Shikama Kota
• Aratake Atsushi

Classifications

• G02B2006/12061

  Silicon · CPC title

• G02B6/122

  Basic optical elements, e.g. light-guiding paths · CPC title

• G02B6/32

  having lens focusing means {positioned between opposed fibre ends (with lens being an integral part of the single fibre end G02B6/262)} · CPC title

• G02B6/26 Primary

  Optical coupling means (G02B6/36, G02B6/42 take precedence) · CPC title

• G02B6/30 Primary

  for use between fibre and thin-film device · CPC title