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
$2-\mu \text{m}$
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-
$\mu \text{s}$
rising time and
$13.2-\mu \text{s}$
falling time, with switching power of 19.2 mW. High speed on-chip MDM routing of
$2\times 60$
Gbps signal was experimentally demonstrated using the proposed 2-
$\mu \text{m}$
MDM switching network, drawing the promising prospect for the future photonic integration and high-speed MDM networking at 2-
$\mu \text{m}$
waveband.