Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-15090
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Main Title: A physical origin of cross-polarization and higher-order modes in two-dimensional (2D) grating couplers and the related device performance limitations
Author(s): Georgieva, Galina
Voigt, Karsten
Seiler, Pascal M.
Mai, Christian
Petermann, Klaus
Zimmermann, Lars
Type: Article
URI: https://depositonce.tu-berlin.de/handle/11303/16315
http://dx.doi.org/10.14279/depositonce-15090
License: https://creativecommons.org/licenses/by/4.0/
Abstract: We explore scattering effects as the physical origin of cross-polarization and higher-order modes in silicon photonic 2D grating couplers (GCs). A simplified analytical model is used to illustrate that in-plane scattering always takes place, independent of grating geometry and design coupling angle. Experimental investigations show furthermore that grating design parameters are especially related to the modal composition of both the target- and the cross-polarization. Scattering effects and the associated cross-polarization and higher-order modes are indicated as the main reason for the higher 2D GC insertion loss compared to standard 1D GCs. In addition, they can be responsible for a variable 2D GC spectrum shape, bandwidth and polarization dependent loss.
Subject(s): two-dimensional grating couplers
silicon photonics
scattering
higher-order modes
cross-polarization
polarization splitting
Issue Date: 26-May-2021
Date Available: 8-Feb-2022
Language Code: en
DDC Class: 530 Physik
Sponsor/Funder: BMBF, 13N14936, Verbundprojekt: Photonic Embedding of Active Region LASER Chips on Silicon (PEARLS) - Teilvorhaben: Integration von III-V Gain-Chips ins obere Backend der Si-Photonik Plattform (BiCMOS)
Journal Title: Journal of Physics: Photonics
Publisher: IOP
Volume: 3
Issue: 3
Article Number: 035002
Publisher DOI: 10.1088/2515-7647/abf942
EISSN: 2515-7647
TU Affiliation(s): Fak. 4 Elektrotechnik und Informatik » Inst. Hochfrequenz- und Halbleiter-Systemtechnologien » FG Hochfrequenztechnik-Photonik
Appears in Collections:Technische Universit├Ąt Berlin » Publications

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