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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 25, Iss. 6 — Jun. 1, 2007
  • pp: 1531–1536

Word-Synchronous Optical Sampling of Periodically Repeated OTDM Data Words for True Waveform Visualization

Erik Benkler and Harald R. Telle

Journal of Lightwave Technology, Vol. 25, Issue 6, pp. 1531-1536 (2007)


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Abstract

An improved phase-locked loop (PLL) for versatile synchronization of a sampling pulse train to an optical data stream is presented. It enables optical sampling of the true waveform of repetitive high bit-rate optical time division multiplexed (OTDM) data words such as pseudorandom bit sequences. Visualization of the true waveform can reveal details, which cause systematic bit errors. Such errors cannot be inferred from eye diagrams and require word-synchronous sampling. The programmable direct-digital-synthesis circuit used in our novel PLL approach allows flexible adaption of virtually any problem-specific synchronization scenario, including those required for waveform sampling, for jitter measurements by slope detection, and for classical eye-diagrams. Phase comparison of the PLL is performed at 10-GHz OTDM base clock rate, leading to a residual synchronization jitter of less than 70 fs.

© 2007 IEEE

Citation
Erik Benkler and Harald R. Telle, "Word-Synchronous Optical Sampling of Periodically Repeated OTDM Data Words for True Waveform Visualization," J. Lightwave Technol. 25, 1531-1536 (2007)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-25-6-1531

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