Field-Deployed Fiber Transmission of DWDM Signal in S+C+L-Band Co-Propagating With 400GBASE-LR8

Allowing the accommodation of different types of optical signals across optical networks in single fiber core to relax constraints in the optical fiber infrastructure is assumed to eliminate bottlenecks of optical network in some cases. As an example of use-case for the coexistence of signals beyond the area of optical networks, we investigate the feasibility of a transmission of dense wavelength-division multiplexed (DWDM) signal typically used for long-haul transmission over a fiber that carries an optical signal for short-reach. We prepared a 176 channel DWDM signal across S+C+L-band to identify the impact of the interaction over a wider wavelength range and transmitted it through a 30-km field-deployed fiber propagating a 400GbE signal separated from the wavelength band occupied by the DWDM signal. Wavelength converters were used to evaluate S-band transmission channels by C-band transceiver. We demonstrate fiber sharing in long-haul and short-reach networks by evaluating signal quality deviation due to coexistence using 400-Gb/s real-time test channels in S-, C-, and L-band DWDM signals as well as the 400GbE signal.