Nature Communications, Published online: 31 July 2026; doi:10.1038/s41467-026-76129-8 This study breaks the high-Q linewidth bottleneck of all-optical broadcasting using a parity-time symmetric coupled microcavity with engineered exceptional points. It achieves over 100 channel on-chip broadcasting spanning 200 nm with aggregated Terabit-per-second data rates and validates its feasibility for on-chip optical convolution computing.