All-optical label processing techniques for pure DPSK optical packets

N. Calabretta, G. Contestabile, A. D'Errico, E. Ciaramella

Research output: Contribution to journalArticleAcademicpeer-review

17 Citations (Scopus)


We present two all-optical label processing schemes for pure differential phase shift keying packets. The two techniques are based on the already used optical correlators and on a novel time-to-wavelength conversion of the label information. They require that the label information is encoded by using pulse position modulation, which makes the label processor simpler and can allow very fast processing speed. We investigate and compare the efficiency in terms of packet overhead of pulse position modulation coded labels with ordinary binary coding and show that pulse position modulation is still attractive for medium-size network and for system implementing optical label swapping. We then experimentally demonstrate that the two techniques can distinguish several labels at distinct outputs. Both operate at low optical power, asynchronously, and could allow for photonic integration. Scalability and processing speeds of the two systems are discussed. We also show that the two label processors can be used to implement an optical label swapping system. Experimental results show that the two labels are distinguished at two distinct ports and erased from the incoming packet, so that a new label can be inserted. Scalability and processing speed are discussed as well.

Original languageEnglish
Article number1668111
Pages (from-to)686-696
Number of pages11
JournalIEEE Journal of Selected Topics in Quantum Electronics
Issue number4
Publication statusPublished - Jul 2006
Externally publishedYes


  • Differential phase-shift keying
  • Label processor
  • Nonlinear polarization rotation
  • Optical correlator
  • Optical label swapping
  • Optical packet switching
  • Self-synchronization
  • Time-to-wavelength conversion
  • Wavelength conversion


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