# US 2014/0153873 A1 · Optical coupling module for silicon photonics chip

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- Number: US 2014/0153873 A1
- Document ID: US20140153873A1
- Status: Published application
- Kind: A1
- Application number: 14/081,197
- Filed: 2013-11-15
- Published: 2014-06-05
- Earliest claimed: 2012-12-03
- Assignees: Electronics and Telecommunications Research Institute
- Applicants: Electronics and Telecommunications Research Institute
- Inventors: Sae-Kyoung KANG; Sang-Soo LEE
- Web page: https://patentgrep.com/patent/US20140153873A1

## CPC

- G02B 6/34: utilising prism or grating {(G02B6/293 takes precedence)}
- G02B 6/1228: {Tapered waveguides, e.g. integrated spot-size transformers (for coupling with fibres G02B6/305)}
- G02B 6/29334: {Grating-assisted evanescent light guide couplers, i.e. comprising grating at or functionally associated with the coupling region between the light guides, e.g. with a grating positioned where light fields overlap in the coupler}
- G02B 6/30: for use between fibre and thin-film device
- G02B 2006/12107: {Grating}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An optical coupling module for a silicon photonics chip in which a grating is formed on an optical waveguide, and a material having an intermediate refractive index between refractive indexes of a core and a cladding for side surface optical coupling of the silicon photonics chip is provided. The optical coupling module which is optically coupled with an internal/external optical fiber comprises a core transmitting light, and a cladding covering the core and holding the light in the core through total internal reflection, wherein a grating is formed at one end of the core, and a refractive element is formed between the one end of the core and the cladding, has an intermediate refractive index between the refractive indexes of the core and the cladding, and is optically coupled with the internal/external optical fiber.

## Claims

### Claim 1

An optical coupling module of a silicon photonics chip which is optically coupled with an internal/external optical fiber, the optical coupling module comprising:
a core transmitting light; and
a cladding covering the core and holding the light in the core through total internal reflection,
wherein a grating is formed at one end of the core, and a refractive element is formed between the one end of the core and the cladding, has an intermediate refractive index between the refractive indexes of the core and the cladding, and is optically coupled with the internal/external optical fiber.

### Claim 2 (depends on 1)

The optical coupling module according to claim 1, wherein the core is formed of a silicon material, and the cladding if formed of a silicon oxide material, and the refractive element is formed of a silicon-based compound.

### Claim 3 (depends on 1)

The optical coupling module according to claim 1, wherein a predetermined space is formed between the refractive element and the core, and the cladding fills the space between the refractive element and the core.

### Claim 4 (depends on 3)

The optical coupling module according to claim 3, wherein a grating is formed on a side surface of the refractive element which is opposite to the core.

### Claim 5 (depends on 1)

The optical coupling module according to claim 1, wherein the grating formed on the core is formed to project outward for each section on an upper portion of the core.

### Claim 6 (depends on 5)

The optical coupling module according to claim 5, wherein the refractive element covers an outer surface of the grating, and is formed on an upper portion of the core.

### Claim 7 (depends on 1)

The optical coupling module according to claim 1, wherein a cross-section of the refractive element is formed to be identical or similar to a cross-section of a core of the internal/external optical fiber.

### Claim 8 (depends on 1)

The optical coupling module according to claim 1, wherein the refractive element outputs an optical signal to the internal/external optical fiber.

### Claim 9 (depends on 1)

The optical coupling module according to claim 1, wherein the refractive element receives an optical signal from the internal/external optical fiber.

### Claim 10 (depends on 1)

The optical coupling module according to claim 1, wherein the refractive element is optically coupled with the external optical fiber in a butt coupling manner.

### Claim 11 (depends on 1)

The optical coupling module according to claim 1, wherein the refractive element is optically coupled with the external optical fiber in a focused lens manner.

### Claim 12 (depends on 1)

The optical coupling module according to claim 1, wherein the silicon photonics chip has a multi-layer structure in which an optical device and an optical waveguide having a specific function are disposed on every layer, and the refractive element is optically coupled with the optical waveguide inside the silicon photonics chip, to transmit and receive an optical signal.