Abstract
Chip-scale all-optical signal broadcasting, which replicates data across multiple wavelength channels via Kerr nonlinearity, is critical for high-throughput optical communication and computing systems. High-quality microcavities boost the inherently weak optical nonlinearity but suffer from Fourier reciprocity, creating a fundamental trade-off that prevents simultaneous generation of the multi-wavelength pump for broadcasting (soliton frequency combs) and massive broadcasting in a single cavity. Here we show that a parity-time symmetric coupled-cavity system featuring equally spaced exceptional points in the frequency domain resolves this limitation. This design integrates comb generation and all-optical broadcasting into a unified process, achieving over 100 usable channels across 200 nm bandwidth with terabit-per-second throughput-three orders of magnitude beyond the intrinsic cavity linewidth limit. We further demonstrate an optical convolutional accelerator, establishing a new non-Hermitian paradigm for chip-scale photonic processing.