1.28 terabit/s (32×40 Gbit/s) WDM transmission system for free space optical communications

E. Ciaramella*, Y. Arimoto, G. Contestabile, M. Presi, A. D'Errico, V. Guarino, M. Matsumoto

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

233 Citations (Scopus)


We review a novel Free Space Optical (FSO) system that represents a significant breakthrough in the area of FSO communications. The system encompasses a pair of novel terminals: these allow direct and transparent optical connection to common single mode fibers and include a dedicated electronic control unit that effectively tracks the signal beam wandering due to atmospheric turbulence and mechanical vibrations. Further improvement in the signal power stabilization is achieved by means of saturated EDFAs. These solutions allow to realize a new FSO system, which is tested in a double-pass FSO link between two buildings in Pisa, Italy. When the terminals are fed by common WDM signals they allow enough power budget and margins to support a record high capacity transmission (32×40 Gbit/s), with a enormous improvement of stability (six hours with no error burst). During day-long transmission, the system behavior has been deeply characterized to correlate any increase of bit error ratio (BER) to the FSO control parameters.

Original languageEnglish
Article number5342323
Pages (from-to)1639-1645
Number of pages7
JournalIEEE Journal on Selected Areas in Communications
Issue number9
Publication statusPublished - 2009 Dec


  • Free space optics (FSO)
  • Optical communications
  • Wavelength Division Mutiplexing (WDM)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications


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