Unrepeatered Transmission of Single-Carrier 800Gb/s over 404km with Commercial Transceiver and Enhanced ROPA System

This paper demonstrates a record unrepeatered transmission of single-carrier 800Gb/s over 404.39km (63.49dB) with a single fiber configuration, using sub-carrier Frequency-Division Multiplexing, optimized high-order Raman pump, forward and backward ROPAs, and ultra-low loss & large effective area fiber.