Ultra-low-loss CMOS-Compatible Waveguide Crossing Arrays Based on Multimode Bloch Waves and Imaginary Coupling

Yangyang Liu, Jeffrey M. Shainline, Xiaoge Zeng +1

We experimentally demonstrate broadband waveguide crossing arrays showing ultra low loss down to $0.04$dB/crossing ($0.9\%$), matching theory, and crosstalk suppression over $35\…