# US 10,371,890 B2 · Optical waveguide element

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- Number: US 10,371,890 B2
- Document ID: US10371890B2
- Status: Granted
- Kind: B2
- Application number: 15/145,482
- Filed: 2016-05-03
- Published: 2016-08-25
- Granted: 2019-08-06
- Earliest claimed: 2013-02-26
- Assignees: Furukawa Electric Co., Ltd.
- Applicants: Furukawa Electric Co., Ltd.
- Inventors: Yasuyoshi Uchida; Yuuki Taniguchi; Hiroshi Kawashima; Kazutaka Nara; Masanori Takahashi
- Web page: https://patentgrep.com/patent/US10371890B2

## CPC

- G02B 6/12011: {characterised by the arrayed waveguides, e.g. comprising a filled groove in the array section}
- C03C 14/004: {the non-glass component being in the form of particles or flakes}
- G02B 6/12016: {characterised by the input or output waveguides, e.g. tapered waveguide ends, coupled together pairs of output waveguides}
- G02B 6/122: Basic optical elements, e.g. light-guiding paths
- G02B 6/136: by etching
- G02B 6/14: Mode converters
- G02B 6/2773: {Polarisation splitting or combining}
- G02B 6/2808: {using a mixing element which evenly distributes an input signal over a number of outputs}
- G02B 6/29338: {Loop resonators}
- G02B 6/29341: {Loop resonators operating in a whispering gallery mode evanescently coupled to a light guide, e.g. sphere or disk or cylinder (evanescent coupling for sensing fluorescence G01N21/648)}
- G02B 6/1228: {Tapered waveguides, e.g. integrated spot-size transformers (for coupling with fibres G02B6/305)}
- G02B 6/125: Bends, branchings or intersections
- G02B 2006/121: {Channel; buried or the like}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS

## Abstract

An optical waveguide element includes: a cladding portion made of silica-based glass; and a plurality of optical waveguides positioned in the cladding portion and made of silica-based glass in which ZrO2 crystal particles are dispersed. The optical waveguide element is a planar lightwave circuit. The plurality of optical waveguides configure an arrayed waveguide grating element.

## Claims

### Claim 1

An optical waveguide element comprising:
a cladding portion made of silica-based glass; and
a plurality of optical waveguides positioned in the cladding portion and made of silica-based glass in which ZrO2 crystal particles are dispersed, wherein
the optical waveguide element is a planar lightwave circuit, and
the plurality of optical waveguides configure an arrayed waveguide grating element, wherein the ZrO2 crystal particles dispersed in the silica-based glass of the plurality of optical waveguides are dispersed to be separated by a distance equal to or smaller than a wavelength of a light input to the waveguide.

### Claim 2 (depends on 1)

The optical waveguide element according to claim 1 wherein
the plurality of optical waveguides includes an optical waveguide the one side of which is configured as a spot size converter.

### Claim 3 (depends on 1)

The optical waveguide element according to claim 1 wherein the cladding portion does not include ZrO2.