Nano-wire bridge waveguide-assisted silicon polarizing beam splitter

H. P. Liu; J. J. Feng; J. Chen; W. J. Zhou; Q. Y. Bi; H. P. Zeng

doi:10.1117/12.2686511

27 November 2023 Nano-wire bridge waveguide-assisted silicon polarizing beam splitter

H. P. Liu, J. J. Feng, J. Chen, W. J. Zhou, Q. Y. Bi, H. P. Zeng

Proceedings Volume 12768, Holography, Diffractive Optics, and Applications XIII; 127681I (2023) https://doi.org/10.1117/12.2686511
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Abstract

A low-loss and wideband silicon polarizing beam splitter is demonstrated with the assistance of a nano-bridge waveguide. Transverse magnetic light can be coupled to the cross port through the nano-bridge waveguide, while the transverse electric light comes out mainly from the through port. The designed device has a coupling length of 19.6 μm, which can realize an extinction ratio of 32.43 dB for TM mode or 34.23 dB for TE mode at a 1565-nm wavelength. Compared with the conventional three-waveguide coupler structure, the proposed device is based on a resonant tunneling principle, which can help to effectively improve the fabrication tolerance. The device is fabricated with a commercial CMOS processing facility, which can achieve an extinction ratio of 23.07 dB for TM or 23.46 dB for TE mode with a low excess loss, and the extinction ratio of more than 10 dB can be realized in the wavelength range from 1525 to 1610 nm for both modes. The device performance can be further improved, which would facilitate its practical applications in commercial integrated optical circuits.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

H. P. Liu, J. J. Feng, J. Chen, W. J. Zhou, Q. Y. Bi, and H. P. Zeng "Nano-wire bridge waveguide-assisted silicon polarizing beam splitter", Proc. SPIE 12768, Holography, Diffractive Optics, and Applications XIII, 127681I (27 November 2023); https://doi.org/10.1117/12.2686511

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KEYWORDS

Waveguides

Beam splitters

Bridges

Fabrication

Polarization

Tolerancing

Silicon

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