Resin optical waveguide

Patent metadata

Field	Value
Publication number	US-10409000-B2
Application number	US-201815884962-A
Country	US
Kind code	B2
Filing date	Jan 31, 2018
Priority date	Aug 4, 2015
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

A resin optical waveguide containing a core, an under cladding and an over cladding having refractive indices lower than that of the core, in which the resin optical waveguide has, at one end side of, a core-exposed section at which the over cladding is not present and the core and the under cladding nearby the core are exposed and, of the under cladding, a portion corresponding to the core-exposed section has a first layer and a second layer that satisfy a certain condition.

First claim

The invention claimed is:

1. A resin optical waveguide comprising a core, an under cladding and an over cladding having refractive indices lower than that of the core,
wherein the resin optical waveguide comprises, at one end side thereof, a core-exposed section at which the over cladding is not present and the core and the under cladding nearby the core are exposed and,
of the under cladding, a portion corresponding to the core-exposed section comprises a first layer and a second layer that satisfy the following (1) to (3):
(1) the first layer and the second layer differ from each other in a distance from an interface with the core or an exposed surface of the under cladding, and the first layer is positioned on a near side to these surfaces and the second layer is positioned on a far side from the interface with the core or the exposed surface of the under cladding;
(2) the first layer is positioned within 15 μm in the distance from the interface with the core or the exposed surface of the under cladding; and
(3) the first layer and the second layer differ from each other in refractive index, and the first layer has a refractive index higher than that of the second layer,
wherein the first layer has a thickness t of 15 μm or less, and wherein the resin optical waveguide has a product (t×(n 1,max -n 2,max )) of the thickness t of the first layer and a difference (n 1,max -n 2,max ) between a maximum value n 1,max of the refractive index of the first layer and a maximum value n 2,max of the refractive index of the second layer being from 0.001 to 0.2 μm.

2. The resin optical waveguide according to claim 1 , wherein the core-exposed section has a length of 100 μm or more in a light propagation direction.

3. The resin optical waveguide according to claim 1 , having a difference (n 1,max -n 2,max ) between a maximum value n 1,max of the refractive index of the first layer and a maximum value n 2,max of the refractive index of the second layer being 0.001 or more.

4. The resin optical waveguide according to claim 1 , having a difference (n′ ,max -n 1,max ) between a maximum value n′ ,max of a refractive index of the core and a maximum value n i,max of the refractive index of the first layer being from 0.008 to 0.02.

5. The resin optical waveguide according to claim 1 , wherein the resin optical waveguide is a single-mode optical waveguide at a wavelength of at least one of 1,310 nm and 1,550 nm.

6. The resin optical waveguide according to claim 1 , wherein the resin optical waveguide has a core size of from 1 to 10 μm.

7. The resin optical waveguide according to claim 1 , wherein the core of the resin optical waveguide is composed of a resin containing fluorine.

8. A resin optical waveguide chip, comprising the resin optical waveguide according to claim 1 connected with a silicon optical waveguide at the core-exposed section of the resin optical waveguide.

Assignees

• Agc Inc

Inventors

• Ohara Seiki
• Takenobu Shotaro

Classifications

• G02B2006/12088

  Monomode · CPC title

• G02B6/1221 Primary

  made from organic materials · CPC title

• G02B6/12

  of the integrated circuit kind (electric integrated circuits H10B, H10D84/00 - H10D89/00, H10F19/00, H10F39/00, H10H29/00, H10K19/00, H10K39/00, H10K59/00, H10N19/00, H10N39/00, H10N59/00, H10N69/00, H10N79/00, H10N89/00) · CPC title

• G02B2006/12147

  Coupler · CPC title

• G02B6/30

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