GMPLS/PCE control of flexi-grid DWDM optical networks using CO-OFDM transmission [Invited]

Ramon Casellas*, Raül Muñoz, Josep M. Fàbrega, Michela Svaluto Moreolo, Ricardo Martínez, Lei Liu, Takehiro Tsuritani, Itsuro Morita

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


Current optical transport networks use optical channel carriers (wavelengths) that are defined and constrained by a fixed ITU-T dense wavelength division multiplexing (DWDM) grid. Such a grid is not adapted to high data rates (beyond 100 Gb/s) and is inefficient when a wavelength is assigned to a low-rate optical signal. Consequently, the ITU-T is updating the set of DWDM reference frequencies with the inclusion of a smaller channel spacing (e.g., 6.25 GHz) while allowing the allocation of frequency slots, that is, variable-sized frequency ranges composed of a number of slices. In this paper, we propose the design, implementation, and experimental validation of a Generalized Multi-Protocol Label Switching/path computation element (GMPLS/PCE) control plane for such flexible optical networks, using optical orthogonal frequency division multiplexing transmission technology, given its unique flexibility, bit-rate/bandwidth scalability, and subwavelength granularity. The control plane uses a distance-adaptive and PCE-based routing and modulation assignment, combined with distributed frequency slot (spectrum) selection. A comparative analysis of path computation algorithms is carried out, highlighting the benefits of extending the path computation function with the knowledge of the status of the slices and the spectral efficiency of the modulation formats.

Original languageEnglish
Article number6360163
Pages (from-to)B1-B10
JournalJournal of Optical Communications and Networking
Issue number11
Publication statusPublished - 2012
Externally publishedYes


  • Control plane for flexi-grid DWDM networks
  • Elastic optical networks

ASJC Scopus subject areas

  • Computer Networks and Communications


Dive into the research topics of 'GMPLS/PCE control of flexi-grid DWDM optical networks using CO-OFDM transmission [Invited]'. Together they form a unique fingerprint.

Cite this