Chalcogenide glass photonic integration for improved 2 μm optical interconnection

In this work, on-chip chalcogenide glass photonic integrations with several fundamental photonic building blocks are designed and fabricated based on the As2S3 platform for improved 2 mu m optical interconnection, achieving a broadened wavelength bandwidth and improved fabrication tolerance. A 600 nm thick As2S3 strip waveguide has low propagation loss of 1.447 dB/cm at 2 mu m. Broadband vertical coupling is realized by a grating coupler with 4.3 dB coupling loss. A Bragg grating filter, power splitter, Mach-Zander interferometer, and mode converter for on-chip mode division multiplexing (MDM) are also reported at 2 mu m with reliable performances. Finally, a record high MDM optical interconnection capacity of 3 x 80 Gbps at 2 mu m is experimentally demonstrated based on the proposed As2S3 chip, drawing promising prospects for future photonic integration and high-speed inter- connection at the 2 mu m waveband. (C) 2020 Chinese Laser Press