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High-efficiency apodized bidirectional grating coupler for perfectly vertical coupling

High-efficiency apodized bidirectional grating coupler for perfectly vertical coupling
High-efficiency apodized bidirectional grating coupler for perfectly vertical coupling
We propose and experimentally demonstrate an apodized bidirectional grating coupler for high-efficiency perfectly vertical coupling. Through grating apodization, the coupling efficiency (CE) can be notably improved and the parasitic reflections can be minimized. For ease of fabrication, subwavelength gratings are introduced, which are also beneficial for the coupling performance. Simulation shows a record CE of 72%. We found the coupler is quite robust to the variation of incidence mode field diameter and fiber misalignment. A CE of -1.8dB is experimentally measured with a 1-dB bandwidth of 37nm.
Silicon photonics
0146-9592
5081
Zhang, Zanyun
7d5e0026-6f42-4bc6-b7d7-d8f814307f8c
Chen, Xia
64f6ab92-ca11-4489-8c03-52bc986209ae
Chen, Qian
84fceb53-63e6-4a9d-b0d0-d66e65a79fd4
Khokhar, Ali
2eedd1cc-8ac5-4f8e-be25-930bd3eae396
Yan, Xingzhao
e1f3f636-74e4-42d5-81c7-04feec2b85ba
Huang, Beiju
ce385b4e-2ef7-41fb-a568-2ada9e13cdd3
Chen, Hongda
eec58f53-9d2c-40b3-9710-ae3518844270
Liu, Hongwei
4ede3cd4-8931-400e-b701-14fa8340f03f
Li, Hongqiang
61fdb586-d85b-405f-b15f-a920f7a8e95c
Thomson, David
17c1626c-2422-42c6-98e0-586ae220bcda
Reed, Graham
ca08dd60-c072-4d7d-b254-75714d570139
Zhang, Zanyun
7d5e0026-6f42-4bc6-b7d7-d8f814307f8c
Chen, Xia
64f6ab92-ca11-4489-8c03-52bc986209ae
Chen, Qian
84fceb53-63e6-4a9d-b0d0-d66e65a79fd4
Khokhar, Ali
2eedd1cc-8ac5-4f8e-be25-930bd3eae396
Yan, Xingzhao
e1f3f636-74e4-42d5-81c7-04feec2b85ba
Huang, Beiju
ce385b4e-2ef7-41fb-a568-2ada9e13cdd3
Chen, Hongda
eec58f53-9d2c-40b3-9710-ae3518844270
Liu, Hongwei
4ede3cd4-8931-400e-b701-14fa8340f03f
Li, Hongqiang
61fdb586-d85b-405f-b15f-a920f7a8e95c
Thomson, David
17c1626c-2422-42c6-98e0-586ae220bcda
Reed, Graham
ca08dd60-c072-4d7d-b254-75714d570139

Zhang, Zanyun, Chen, Xia, Chen, Qian, Khokhar, Ali, Yan, Xingzhao, Huang, Beiju, Chen, Hongda, Liu, Hongwei, Li, Hongqiang, Thomson, David and Reed, Graham (2019) High-efficiency apodized bidirectional grating coupler for perfectly vertical coupling. Optics Letters, 44 (20), 5081, [OL.44.005081]. (doi:10.1364/OL.44.005081).

Record type: Article

Abstract

We propose and experimentally demonstrate an apodized bidirectional grating coupler for high-efficiency perfectly vertical coupling. Through grating apodization, the coupling efficiency (CE) can be notably improved and the parasitic reflections can be minimized. For ease of fabrication, subwavelength gratings are introduced, which are also beneficial for the coupling performance. Simulation shows a record CE of 72%. We found the coupler is quite robust to the variation of incidence mode field diameter and fiber misalignment. A CE of -1.8dB is experimentally measured with a 1-dB bandwidth of 37nm.

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Accepted/In Press date: 5 September 2019
Published date: 15 October 2019
Keywords: Silicon photonics

Identifiers

Local EPrints ID: 435841
URI: http://eprints.soton.ac.uk/id/eprint/435841
ISSN: 0146-9592
PURE UUID: 2d2faa30-d091-4705-80ff-89205dcbd40d
ORCID for Xia Chen: ORCID iD orcid.org/0000-0002-0994-5401

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Date deposited: 21 Nov 2019 17:30
Last modified: 18 Feb 2021 17:19

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Contributors

Author: Zanyun Zhang
Author: Xia Chen ORCID iD
Author: Qian Chen
Author: Ali Khokhar
Author: Xingzhao Yan
Author: Beiju Huang
Author: Hongda Chen
Author: Hongwei Liu
Author: Hongqiang Li
Author: David Thomson
Author: Graham Reed

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