Silicon nano-bridge waveguide assisted polarizing beam splitter

• Published in: Optics and laser technology Vol. 167; p. 109684
• Main Authors: Liu, Haipeng, Feng, Jijun, Chen, Jian, Zhou, Wenjie, Bi, Qunyu, Zeng, Heping
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-12-2023
• Subjects: Bridge waveguide; Polarizing beam splitter; Silicon photonics; Bridge waveguide; Silicon photonics; Polarizing beam splitter
• ISSN: 0030-3992; 1879-2545
• DOI: 10.1016/j.optlastec.2023.109684

[Display omitted]
•A nano-bridge waveguide was used to realize a directional coupler based polarizing beam splitter.•TM light can be resonant tunneling coupling between nano-bridge and strip waveguides and output from the cross port, which can help to improve the fabrication tolerance.•A wide working bandwidth, high extinction ratio and low excess loss can be realized with a moderate device size.
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.