Journal
PHOTONICS RESEARCH
Volume 10, Issue 1, Pages A8-A13Publisher
CHINESE LASER PRESS
DOI: 10.1364/PRJ.443543
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Funding
- Horizon 2020 Framework Programme [824096]
- H2020 Future and Emerging Technologies [899679]
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This study proposes a compact coupling scheme for silicon carbide polarization beam splitter, which enables efficient low-birefringence polarization splitting by modulating the magnetic mode distribution. The performance of the device is experimentally validated.
The polarization beam splitter is a key component for polarization manipulation in photonic integrated circuits, but it is challenging to design for low-refractive-index optical materials, due to the low birefringence of the wave-guides. We propose what we believe is a novel compact vertical-dual-slot waveguide-based coupling scheme for silicon carbide, enabling efficient low-birefringence polarization splitting by extensively modulating the transverse-magnetic mode distribution. We numerically and experimentally demonstrate the device in the 4H-silicon-carbide-on-insulator integrated platform, with a small footprint of 2:2 mu m x 15 mu m. The device, easy to fabricate via a single lithography process as other components on the chip, exhibits low insertion loss of <0.71 dB and <0.51 dB for the transverse-electric and transverse-magnetic polarized light, respectively, and polarization extinction ratio of >13 dB, over 80 nm wavelength range. (C) 2021 Chinese Laser Press
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