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Two-dimensional apodized grating coupler for polarization-independent and surface-normal optical coupling

Two-dimensional apodized grating coupler for polarization-independent and surface-normal optical coupling
Two-dimensional apodized grating coupler for polarization-independent and surface-normal optical coupling
A four-port grating coupler with etched square holes is proposed and demonstrated for surface-normal and polarization independent coupling. Benefiting from the perfectly vertical coupling and 1×4 power splitting/combing scheme, efficient polarization independent operation was achieved. The coupling efficiency was further improved by grating apodization. According to the simulations, the proposed two-dimensional (2D) apodized grating coupler can achieve a coupling efficiency (CE) of 64.5% (-1.9dB), a low upward back-reflection of 8.5% (-11dB) and polarization-dependent loss (PDL) lower than 0.04dB across the wavelength range of 1520-1620nm. A CE of 56.3% (-2.5dB) was experimentally measured, with PDL be-low 0.4dB within the C-band and lower than 0.7dB within the L-band. Waveguide delay lines were used to compensate the waveguide channel phase differences at the output port.
Silicon photonics, Grating coupler
0733-8724
Zhang, Zanyun
7d5e0026-6f42-4bc6-b7d7-d8f814307f8c
Chen, Xia
64f6ab92-ca11-4489-8c03-52bc986209ae
Cheng, Qian
53938597-7e9c-4003-bf85-b193b4232710
Khokhar, Ali Z
2eedd1cc-8ac5-4f8e-be25-930bd3eae396
Zhang, Zan
e94846b6-968c-4c0f-918a-4984fa790303
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
Cheng, Qian
53938597-7e9c-4003-bf85-b193b4232710
Khokhar, Ali Z
2eedd1cc-8ac5-4f8e-be25-930bd3eae396
Zhang, Zan
e94846b6-968c-4c0f-918a-4984fa790303
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, Cheng, Qian, Khokhar, Ali Z, Zhang, Zan, Yan, Xingzhao, Huang, Beiju, Chen, Hongda, Liu, Hongwei, Li, Hongqiang, Thomson, David and Reed, Graham (2020) Two-dimensional apodized grating coupler for polarization-independent and surface-normal optical coupling. Journal of Lightwave Technology. (doi:10.1109/JLT.2020.2986043).

Record type: Article

Abstract

A four-port grating coupler with etched square holes is proposed and demonstrated for surface-normal and polarization independent coupling. Benefiting from the perfectly vertical coupling and 1×4 power splitting/combing scheme, efficient polarization independent operation was achieved. The coupling efficiency was further improved by grating apodization. According to the simulations, the proposed two-dimensional (2D) apodized grating coupler can achieve a coupling efficiency (CE) of 64.5% (-1.9dB), a low upward back-reflection of 8.5% (-11dB) and polarization-dependent loss (PDL) lower than 0.04dB across the wavelength range of 1520-1620nm. A CE of 56.3% (-2.5dB) was experimentally measured, with PDL be-low 0.4dB within the C-band and lower than 0.7dB within the L-band. Waveguide delay lines were used to compensate the waveguide channel phase differences at the output port.

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manuscript-JLT-R3_final - Accepted Manuscript
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Accepted/In Press date: 1 April 2020
e-pub ahead of print date: 8 April 2020
Keywords: Silicon photonics, Grating coupler

Identifiers

Local EPrints ID: 439594
URI: http://eprints.soton.ac.uk/id/eprint/439594
ISSN: 0733-8724
PURE UUID: e7c3872e-1520-49ba-b2d6-7fdefa9fd6df
ORCID for Xia Chen: ORCID iD orcid.org/0000-0002-0994-5401

Catalogue record

Date deposited: 27 Apr 2020 16:47
Last modified: 18 Feb 2021 17:19

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Contributors

Author: Zanyun Zhang
Author: Xia Chen ORCID iD
Author: Qian Cheng
Author: Ali Z Khokhar
Author: Zan Zhang
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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