We present the transmission of a 19.2 THz-wide signal spanning the S-, C-, and L-bands, over a standard-cladding- diameter, 69.3 km-long coupled-core four-core fiber (CC-4CF), field-deployed in the Italian city of L'Aquila. The transmission of 1540 × 12.25 GBaud spatial super-channels with polarization-division multiplexed (PDM) 256-ary quadrature-amplitude modulation (256QAM), 64QAM, and 4QAM signals, relying on a hybrid amplification scheme integrating lumped amplification and distributed Raman amplification (DRA) with single-core pumping per direction, results in an aggregate throughput of 929.9 Tb/s estimated using generalized mutual information (GMI) and 864.8 Tb/s after forward-error correction (FEC) decoding. Uniformity of the DRA is verified by analyzing the system mode-dependent loss both with and without Raman amplification. Transmission of the same set of signals over a co-deployed 6.3 km-long CC-4CF, omitting Raman amplification, results in an aggregate throughput of 955 Tb/s estimated using GMI and 892.9 Tb/s after FEC-decoding, showing only a 3% improvement compared to the longer fiber link. This highlights the substantial benefit of using DRA to support multi-band wavelength-division multiplexing over coupled-core multi-core fibers (CC-MCFs). This work reports the first demonstration of S+C+L band transmission over standard-cladding-diameter CC-MCFs, the first use of DRA in such fibers, and the highest reported throughput ever achieved over any field-deployed fiber.
19.2 THz S+C+L Transmission Over Field-Deployed Coupled-Core Multi-Core Fiber Enabled by Distributed Raman Amplification / Di Sciullo, G., Luis, R.S., Hout, M.V.D., Emmerich, R., Braig-Christophersen, N., Wu, Q.i., Puttnam, B.J., Shaji, D.A., Marotta, A., Graziosi, F., Mecozzi, A., Schubert, C., Hayashi, T., Nagashima, T., Okonkwo, C., Rademacher, G., Lasagni, C., Serena, P., Nespola, A., Furukawa, H., et al.. - In: JOURNAL OF LIGHTWAVE TECHNOLOGY. - ISSN 0733-8724. - 44:16(2026), pp. 7064-7072. [10.1109/jlt.2026.3713754]
19.2 THz S+C+L Transmission Over Field-Deployed Coupled-Core Multi-Core Fiber Enabled by Distributed Raman Amplification
Lasagni, Chiara;Serena, Paolo;
2026-01-01
Abstract
We present the transmission of a 19.2 THz-wide signal spanning the S-, C-, and L-bands, over a standard-cladding- diameter, 69.3 km-long coupled-core four-core fiber (CC-4CF), field-deployed in the Italian city of L'Aquila. The transmission of 1540 × 12.25 GBaud spatial super-channels with polarization-division multiplexed (PDM) 256-ary quadrature-amplitude modulation (256QAM), 64QAM, and 4QAM signals, relying on a hybrid amplification scheme integrating lumped amplification and distributed Raman amplification (DRA) with single-core pumping per direction, results in an aggregate throughput of 929.9 Tb/s estimated using generalized mutual information (GMI) and 864.8 Tb/s after forward-error correction (FEC) decoding. Uniformity of the DRA is verified by analyzing the system mode-dependent loss both with and without Raman amplification. Transmission of the same set of signals over a co-deployed 6.3 km-long CC-4CF, omitting Raman amplification, results in an aggregate throughput of 955 Tb/s estimated using GMI and 892.9 Tb/s after FEC-decoding, showing only a 3% improvement compared to the longer fiber link. This highlights the substantial benefit of using DRA to support multi-band wavelength-division multiplexing over coupled-core multi-core fibers (CC-MCFs). This work reports the first demonstration of S+C+L band transmission over standard-cladding-diameter CC-MCFs, the first use of DRA in such fibers, and the highest reported throughput ever achieved over any field-deployed fiber.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
