640 GBd Phase-Correlated OTDM NRZ-OOK Generation and Field Trial Transmission

Hao Hu, Petr Münster, Evarist Palushani, Michael Galili, Hans Christian Hansen Mulvad, Palle Jeppesen, Leif Katsuo Oxenløwe

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We generate a 640 GBd phase-correlated optical time-division multiplexed (PC-OTDM) return-to-zero ON–OFF keying (RZ-OOK) signal based on cross-phase-modulation-induced cross-polarization rotation in an Al highly nonlinear fiber and a 640 GBd PC-OTDM nonreturn-to-zero (NRZ)-OOK signal by RZ-to-NRZ conversion using passive filtering. This is employed in a 1.19 Tb/s PDM-NRZ-OOK field transmission with ${\rm BER} <3.8\times 10^{-3}$ for all 128 tributaries. As a benefit of phase coherence between adjacent TDM channels, a PC-OTDM signal can be very tolerant to strict filtering and the bandwidth of the 640 GBd PC-OTDM NRZ-OOK signal can be restricted to 700 GHz. In addition, with a narrower spectrum a PC-OTDM NRZ-OOK signal is more tolerant to chromatic dispersion and polarization-mode dispersion compared to a conventional (i.e., phase-uncorrelated) OTDM RZ signal.
Original languageEnglish
JournalJournal of Lightwave Technology
Issue number4
Pages (from-to)696-701
Publication statusPublished - 2013


  • Field trial transmission
  • Nonreturn-to-zero (NRZ)
  • Phase-correlated optical time-division multiplexing (PC-OTDM)
  • Highly nonlinear fiber (HNLF)
  • Cross-phase modulation (XPM)
  • Cross-polarization rotation (CPR)


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