Abstract
In optical fiber networks, unrepeated links are cost effective solutions to provide connectivity in challenging contexts that hinder the deployment of in-line amplifiers. Extending the optical bandwidth beyond the C-band with ultra-wideband (UWB) amplification schemes is a promising way to scale the wavelength division multiplexed (WDM) throughput of such single-span systems. In this paper, we report on the use of semiconductor optical amplifiers (SOAs) combined with distributed Raman pumping to enable 100 nm ultra-wideband unrepeated transmissions over a 257.5 km ultra low-loss, large effective area fiber span. Leveraging state-of-the-art digital signal processing, wavelength-adaptive modulation and soft-decision forward error correction (FEC) schemes, we demonstrate a record capacity-distance product of 25.6 Pb/s <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\cdot$</tex-math></inline-formula> km, with a net throughput of 99.35 Tb/s over 257.5 km, using 247×49 GBd channels in S-, C- and L-bands.
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