First Demonstration of Distributed Characterization over 100 km Anti-Resonant Hollow-Core Fiber in Real-time widened C+L-band WDM Transmission

We demonstrate real-time monitoring of $80 \times 800$-Gb/s PCS-16QAM widened C+L-band WDM transmission over 100 km HCF using a specifically-designed on-line FDM-OTDR, achieving a 40-dB dynamic range, 30-s measurement time, and 870-m spatial resolution without BER penalty.