Ultrawideband Systems and Networks: Beyond C + L-Band

Takeshi Hoshida, Vittorio Curri, Lidia Galdino, David T. Neilson, Wladek Forysiak, Johannes K. Fischer, Tomoyuki Kato, Pierluigi Poggiolini

Research output: Contribution to journalArticlepeer-review


In the evolution of optical networks, spectral efficiency (SE) enhancement has been the most cost-efficient and thus the main driver for capacity increase for decades. As a result, the development of optical transport systems has been focused on the C - and L -bands, where silica optical fiber exhibits the lowest attenuation, and erbium-doped fiber amplifiers provide an efficient solution to compensate for the optical loss. With a gradual maturity in the SE growth, however, the extension of the optical bandwidth beyond the C + L -band is expected to play a significant role in future capacity upgrades of optical networks and, thus, attract increasing research interests. In this article, we discuss the merits and challenges of ultrawideband optical transport systems and networks beyond conventional bands.

Original languageEnglish
Pages (from-to)1725-1741
Number of pages17
JournalProceedings of the IEEE
Issue number11
Early online date15 Sept 2022
Publication statusPublished - 1 Nov 2022

Bibliographical note

This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/

Funding: The work of Vittorio Curri, Johannes K. Fischer, and Wladek
Forysiak was supported by the EU Horizon 2020 under Grant 814276. The work
of Lidia Galdino was supported by the Royal Academy of Engineering and EPSRC
Program under Grant EP/R035342/1. The work of Pierluigi Poggiolini was
supported by the PhotoNext Inter-Department Laboratory of Politecnico di


  • Mathematical models
  • Nonlinear optics
  • Optical communication
  • Optical fiber networks
  • Optical receivers
  • Optical scattering
  • Optical wavelength conversion
  • Raman amplification
  • Wavelength division multiplexing
  • optical network and switching
  • optical transceiver (TRx)
  • ultrawideband (UWB) transmission
  • wavelength conversion
  • wavelength-division multiplexing (WDM)


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