Compact and broadband dual-polarization waveguide crossing utilizing subwavelength-hole-assisted MMI couplers

Ni, B., Luo, C., Chen, H., Wu, S., Hou, L. , Liu, H. and Xiong, J. (2023) Compact and broadband dual-polarization waveguide crossing utilizing subwavelength-hole-assisted MMI couplers. Optics Letters, 48(22), pp. 6040-6043. (doi: 10.1364/OL.505887) (PMID:37966784)

Abstract

In this Letter, an ultracompact silicon-based waveguide crossing for dual polarizations is proposed and experimentally demonstrated using subwavelength-hole-assisted multimode interference couplers. Thanks to the flexible and easy dispersion engineering in the introduced subwavelength-hole-assisted multimode interference couplers, the reduced and equal beat lengths for dual polarizations are accessible via careful parametric optimization, consequently enabling a substantially reduced device size. Experimental results indicate that the proposed crossing (13.6 × 13.6 µm2 in size) features a low insertion loss of 1.03 dB (0.76 dB) and low crosstalk of –32.5 dB (–37.8 dB) at a central wavelength of 1550 nm for TE (TM) mode, with a broad bandwidth of ∼80 nm for crosstalk of <–18 dB.

• Item Type: Articles
• Additional Information: Funding: Natural Science Foundation of Jiangsu Province (BK20210326), National Natural Science Foundation of China (U1738137).
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Hou, Dr Lianping
• Authors: Ni, B., Luo, C., Chen, H., Wu, S., Hou, L., Liu, H., and Xiong, J.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Optics Letters
• Publisher: Optica Publishing Group
• ISSN: 0146-9592
• ISSN (Online): 1539-4794
• Published Online: 14 November 2023
• Copyright Holders: Copyright © 2023 Optica Publishing Group
• First Published: First published in Optics Letters 48(22):6040-6043
• Publisher Policy: Reproduced in accordance with the publisher copyright policy