Time-lens based optical packet pulse compression and retiming

Janaina Laguardia Areal, Hao Hu, Evarist Palushani, Anders Clausen, Michael Stübert Berger, Leif Katsuo Oxenløwe

Research output: Contribution to journalConference articleResearchpeer-review


This paper presents a new optical circuit that performs both pulse compression and frame synchronization and retiming. Our design aims at directly multiplexing several 10G Ethernet data packets (frames) to a high-speed OTDM link. This scheme is optically transparent and does not require clock recovery, resulting in a potentially very efficient solution. The scheme uses a time-lens, implemented through a sinusoidally driven optical phase modulation, combined with a linear dispersion element. As time-lenses are also used for pulse compression, we design the circuit also to perform pulse compression, as well. The overall design is: (1) Pulses are converted from NRZ to RZ; (2) pulses are synchronized, retimed and further compressed at the specially designed time-lens; and (3) with adequate optical delays, frames from different input interfaces are added, with a simple optical coupler, completing the OTDM signal generation. We demonstrate the effectiveness of the design by laboratory experiments.
Original languageEnglish
JournalProceedings of SPIE, the International Society for Optical Engineering
Pages (from-to)77280T
Publication statusPublished - 2010
EventPhotonics Europe: Nonlinear Optics and Applications IV - Brussels, Belgium
Duration: 12 Apr 201016 Apr 2010


ConferencePhotonics Europe


  • pulse compression
  • OTDM
  • frame retiming
  • 10G Ethernet
  • time-lens
  • frame synchronization


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