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Polarization-Splitting Grating Coupler on Lithium Niobate Thin Film

Authors :
Zhihua Chen
Longxi Chen
Xiangjia Meng
Yufu Ning
Yang Xun
Source :
Crystals, Vol 14, Iss 3, p 226 (2024)
Publication Year :
2024
Publisher :
MDPI AG, 2024.

Abstract

In this study, one-dimensional grating coupler on single-crystal lithium niobate thin film (lithium niobate on insulator, LNOI) that also served as a polarization splitter was designed. The coupler could separate both orthogonal polarization states into two opposite directions while coupled light from a standard single-mode fiber to a waveguide on LNOI at the same time. Using segmented and apodized designing, the peak coupling efficiencies (CEs) around telecommunication wavelength 1550 nm for fundamental TE and TM modes of −2.82 dB and −2.83 dB, respectively, were achieved. The CEs could be optimized to −1.97 dB and −1.8 dB when a metal layer was added below the silicon dioxide layer.

Details

Language :
English
ISSN :
20734352
Volume :
14
Issue :
3
Database :
Directory of Open Access Journals
Journal :
Crystals
Publication Type :
Academic Journal
Accession number :
edsdoj.1f755457a4c44200b90f473f93f451bd
Document Type :
article
Full Text :
https://doi.org/10.3390/cryst14030226