Variable delay of Gbit/s data using coded Brillouin dynamic gratings

Yair Antman, Lior Yaron, Tomy Langer, Moshe Tur, Avi Zadok

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations


Dynamic Brillouin gratings (DBGs), inscribed by co-modulating two writing pump waves with a bi-phase code, are analyzed theoretically, simulated numerically, demonstrated and characterized experimentally. A comparison is made between modulation by pseudo-random bit sequences (PRBS) and perfect Golomb codes. Numerical analysis shows that Golomb codes provide lower off-peak reflectivity, due to the unique properties of their cyclic auto-correlation function. Golomb coded DBGs can therefor allow for the long variable delay of one-time probe waveforms with higher signal-tonoise ratios, and without averaging. A figure of merit is proposed, in terms of the optical signal-to-noise ratio of reflected waveforms and the delay-bandwidth product of the setup. As an example, the variable delay of return-to-zero, on-off keyed data at 1 Gbit/s rate, by as much as 10 ns, is successfully demonstrated. The eye diagram of the reflected waveform remains open, whereas PRBS modulation of the pump waves results in a closed eye.

Original languageEnglish
Title of host publicationAdvances in Slow and Fast Light VII
ISBN (Print)9780819499110
StatePublished - 2014
EventAdvances in Slow and Fast Light VII - San Francisco, CA, United States
Duration: 2 Feb 20145 Feb 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceAdvances in Slow and Fast Light VII
Country/TerritoryUnited States
CitySan Francisco, CA


  • Stimulated Brillouin scattering
  • all-optical variable delay
  • dynamic gratings
  • phase codes
  • slow and fast light


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