Coherent 1-μm-Band Co-Transmission with C+L-Band Channels over 50-km Hollow-Core Fiber

Abstract

We experimentally demonstrate simultaneous coherent transmission across 1-$\mu$m and C+L bands, carrying $54\times 125$-GBaud PDM-16QAM C+L channels and $2\times 15$-GBaud PDM-QPSK 1-$\mu$m channels over 50 km, highlighting 1 $\mu$m as a promising additional transmission window while avoiding gas-absorption constraints in C/L-band of HCFs.