On-Chip Selective Dual-Mode Switch for 2-μm Wavelength High-Speed Optical Interconnection

In this work, we designed and fabricated a dual-mode switch based on triple-waveguide couplers and two thermal phase shifters, and demonstrated the first silicon-integrated mode division multiplexing (MDM) switching network for 2-μm waveband. The proposed dual-mode switch shows < 2.6 dB insertion loss, <-20 dB inter-mode crosstalk at 1960 nm, with broadband operation over 100 nm. The experimental results of dynamic switching at 10 kHz presents 9.2- μs rising time and 13.2-μs falling time, with switching power of 19.2 mW. High speed on-chip MDM routing of 2× 60 Gbps signal was experimentally demonstrated using the proposed 2- μm MDM switching network, drawing the promising prospect for the future photonic integration and high-speed MDM networking at 2- μm waveband.