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Main Title: Design and performance analysis of integrated focusing grating couplers for the transverse-magnetic TM00 mode in a photonic BiCMOS technology
Author(s): Georgieva, Galina
Voigt, Karsten
Peczek, Anna
Mai, Christian
Zimmermann, Lars
Type: Article
Abstract: Focusing grating couplers for the excitation of the fundamental transverse-magnetic (TM) mode in integrated silicon photonic waveguides are designed and characterized under the boundary conditions of a photonic BiCMOS foundry. Two types of waveguide geometries are considered – a nanowire and a rib waveguide. Wafer-scale experimental results for nanowire TM grating couplers are in excellent agreement with numerical investigations and demonstrate a robust behavior on the wafer. The mean coupling loss and the 3σ interval are -3.9 ± 0.3 dB. The on wafer variation is three times lower than for the fundamental transverse-electric (TE) polarization. Similarly, the coupling in rib waveguides is examined as well. The results indicate that the rib waveguides require a modified geometry when designed for TM. In general, the nanowire waveguide type is more suitable for TM coupling, showing a stable and repeatable performance.
Subject(s): photonic integration
integrated waveguides
silicon nanowire
silicon rib waveguide
transverse-magnetic mode
focusing grating coupler
integrated grating coupler
photonic BiCMOS
Issue Date: 8-Apr-2020
Date Available: 9-Sep-2020
Language Code: en
DDC Class: 530 Physik
Sponsor/Funder: DFG, 414044773, Open Access Publizieren 2019 - 2020 / Technische Universität Berlin
Journal Title: Journal of the European Optical Society: Rapid Publications
Publisher: Springer
Volume: 16
Article Number: 7
Publisher DOI: 10.1186/s41476-020-00129-4
EISSN: 1990-2573
TU Affiliation(s): Fak. 4 Elektrotechnik und Informatik » Inst. Hochfrequenz- und Halbleiter-Systemtechnologien » FG Hochfrequenztechnik-Photonik
Appears in Collections:Technische Universität Berlin » Publications

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