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

• DOI: 10.1364/ol.505887
• Publication Date: 2023-10-23T14:00:36Z
• Authors: Bin Ni; Chenyang Luo; Hanyue Chen; Shengbao Wu; Lianping Hou; Hao Liu; Jichuan Xiong
• Keywords: Waveguide; Crosstalk

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 easy dispersion engineering in introduced couplers, reduced equal beat lengths are accessible via careful parametric optimization, consequently enabling a substantially device size. Experimental results indicate that (13.6 × 13.6 µm