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Experimental demonstration of an apodized-imaging chip-fiber grating coupler for Si3N4 waveguides

Experimental demonstration of an apodized-imaging chip-fiber grating coupler for Si3N4 waveguides
Experimental demonstration of an apodized-imaging chip-fiber grating coupler for Si3N4 waveguides
A silicon nitride waveguide is a promising platform for integrated photonics, particularly due to its low propagation loss compared to other complementary metal–oxide–semiconductor compatible waveguides, including silicon-on-insulator. Input/output coupling in such thin optical waveguides is a key issue for practical implementations. Fiber-to-chip grating couplers in silicon nitride usually exhibit low coupling efficiency because the moderate index contrast leads to weak radiation strengths and poor directionality. Here, we present the first, to the best of our knowledge, experimental demonstration of a recently proposed apodized-imaging fiber-to-chip grating coupler in silicon nitride that images an in-plane waveguide mode to an optical fiber placed at a specific distance above the chip. By employing amplitude and phase apodization, the diffracted optical field of the grating is matched to the fiber mode. High grating directionality is achieved by using staircase grating teeth, which produce a blazing effect. Experimental results demonstrate an apodized-imaging grating coupler with a record coupling efficiency of -1.5 dB and a 3 dB bandwidth of 60 nm in the C-band.
0146-9592
3566-3569
Chen, Yang
3a0b5e8f-c20f-4649-ac08-0a180a946c2a
Bucio, Thalia Dominguez
83b57799-c566-473c-9b53-92e9c50b4287
Khokhar, Ali Z.
2eedd1cc-8ac5-4f8e-be25-930bd3eae396
Banakar, Mehdi
ad56fc0a-728c-4abb-8be5-74318bb2758e
Grabska, Katarzyna
b8a061e3-7774-4b33-be83-74e1a0aec31a
Gardes, Frederic Y.
7a49fc6d-dade-4099-b016-c60737cb5bb2
Halir, Robert
e3f8d90b-0067-4e1a-a6b1-0217c342dd55
Molina-Fernandez, Inigo
e7b4acfd-266a-410b-b4b6-1a9c482c77a0
Cheben, Pavel
ab8ffd13-bc5c-44cb-88ed-605e3c347848
He, Jian-Jun
97e9788f-6e36-4a6b-ac1c-094817d95ce5
Chen, Yang
3a0b5e8f-c20f-4649-ac08-0a180a946c2a
Bucio, Thalia Dominguez
83b57799-c566-473c-9b53-92e9c50b4287
Khokhar, Ali Z.
2eedd1cc-8ac5-4f8e-be25-930bd3eae396
Banakar, Mehdi
ad56fc0a-728c-4abb-8be5-74318bb2758e
Grabska, Katarzyna
b8a061e3-7774-4b33-be83-74e1a0aec31a
Gardes, Frederic Y.
7a49fc6d-dade-4099-b016-c60737cb5bb2
Halir, Robert
e3f8d90b-0067-4e1a-a6b1-0217c342dd55
Molina-Fernandez, Inigo
e7b4acfd-266a-410b-b4b6-1a9c482c77a0
Cheben, Pavel
ab8ffd13-bc5c-44cb-88ed-605e3c347848
He, Jian-Jun
97e9788f-6e36-4a6b-ac1c-094817d95ce5

Chen, Yang, Bucio, Thalia Dominguez, Khokhar, Ali Z., Banakar, Mehdi, Grabska, Katarzyna, Gardes, Frederic Y., Halir, Robert, Molina-Fernandez, Inigo, Cheben, Pavel and He, Jian-Jun (2017) Experimental demonstration of an apodized-imaging chip-fiber grating coupler for Si3N4 waveguides. Optics Letters, 42 (18), 3566-3569. (doi:10.1364/OL.42.003566).

Record type: Article

Abstract

A silicon nitride waveguide is a promising platform for integrated photonics, particularly due to its low propagation loss compared to other complementary metal–oxide–semiconductor compatible waveguides, including silicon-on-insulator. Input/output coupling in such thin optical waveguides is a key issue for practical implementations. Fiber-to-chip grating couplers in silicon nitride usually exhibit low coupling efficiency because the moderate index contrast leads to weak radiation strengths and poor directionality. Here, we present the first, to the best of our knowledge, experimental demonstration of a recently proposed apodized-imaging fiber-to-chip grating coupler in silicon nitride that images an in-plane waveguide mode to an optical fiber placed at a specific distance above the chip. By employing amplitude and phase apodization, the diffracted optical field of the grating is matched to the fiber mode. High grating directionality is achieved by using staircase grating teeth, which produce a blazing effect. Experimental results demonstrate an apodized-imaging grating coupler with a record coupling efficiency of -1.5 dB and a 3 dB bandwidth of 60 nm in the C-band.

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Published date: 11 September 2017

Identifiers

Local EPrints ID: 441705
URI: http://eprints.soton.ac.uk/id/eprint/441705
ISSN: 0146-9592
PURE UUID: 650975c9-c6ee-4192-8e6f-e6b5d107e397
ORCID for Thalia Dominguez Bucio: ORCID iD orcid.org/0000-0002-3664-1403

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Date deposited: 24 Jun 2020 16:30
Last modified: 29 Jul 2020 01:50

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Contributors

Author: Yang Chen
Author: Ali Z. Khokhar
Author: Mehdi Banakar
Author: Robert Halir
Author: Inigo Molina-Fernandez
Author: Pavel Cheben
Author: Jian-Jun He

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