A compact and polarization-insensitive silicon waveguide crossing based on subwavelength grating MMI couplers

• DOI: 10.1364/oe.399568
• Publication Date: 2020-08-17T12:31:57Z
• Authors: Sailong Wu; Simei Mao; Lidan Zhou; Lin Liu; Yujie Chen; Xin Mu; Lirong Cheng; Zhenmin Chen; Xin Tu; H. Y. Fu
• Keywords: Waveguide

In this work, we proposed and experimentally demonstrated a compact low polarization-dependent silicon waveguide crossing based on subwavelength grating multimode interference couplers. The structure decreases the effective refractive index difference shrinks device footprint. Our designed is fabricated 220-nm SOI platform performs well. measured characterized with insertion loss (< 1 dB), polarization-dependence 0.6 crosstalk -35 dB) for both TE TM polarizations footprint of 12.5 μm × μm.