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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 32 — Nov. 10, 2011
  • pp: 6063–6072

Information-theoretic analysis of a stimulated-Brillouin-scattering-based slow-light system

Myungjun Lee, Yunhui Zhu, Daniel J. Gauthier, Michael E. Gehm, and Mark A. Neifeld  »View Author Affiliations


Applied Optics, Vol. 50, Issue 32, pp. 6063-6072 (2011)
http://dx.doi.org/10.1364/AO.50.006063


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Abstract

We use an information-theoretic method developed by Neifeld and Lee [ J. Opt. Soc. Am. A 25, C31 (2008)] to analyze the performance of a slow-light system. Slow-light is realized in this system via stimulated Brillouin scattering in a 2 km -long, room-temperature, highly nonlinear fiber pumped by a laser whose spectrum is tailored and broadened to 5 GHz . We compute the information throughput (IT), which quantifies the fraction of information transferred from the source to the receiver and the information delay (ID), which quantifies the delay of a data stream at which the information transfer is largest, for a range of experimental parameters. We also measure the eye-opening (EO) and signal-to-noise ratio (SNR) of the transmitted data stream and find that they scale in a similar fashion to the information-theoretic method. Our experimental findings are compared to a model of the slow-light system that accounts for all pertinent noise sources in the system as well as data-pulse distortion due to the filtering effect of the SBS process. The agreement between our observations and the predictions of our model is very good. Furthermore, we compare measurements of the IT for an optimal flattop gain profile and for a Gaussian-shaped gain profile. For a given pump-beam power, we find that the optimal profile gives a 36% larger ID and somewhat higher IT compared to the Gaussian profile. Specifically, the optimal (Gaussian) profile produces a fractional slow-light ID of 0.94 (0.69) and an IT of 0.86 (0.86) at a pump-beam power of 450 mW and a data rate of 2.5 Gbps . Thus, the optimal profile better utilizes the available pump-beam power, which is often a valuable resource in a system design.

© 2011 Optical Society of America

OCIS Codes
(060.4370) Fiber optics and optical communications : Nonlinear optics, fibers
(060.4510) Fiber optics and optical communications : Optical communications
(190.2640) Nonlinear optics : Stimulated scattering, modulation, etc.
(200.3050) Optics in computing : Information processing
(260.2030) Physical optics : Dispersion
(290.5900) Scattering : Scattering, stimulated Brillouin

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: August 10, 2011
Manuscript Accepted: September 12, 2011
Published: November 3, 2011

Citation
Myungjun Lee, Yunhui Zhu, Daniel J. Gauthier, Michael E. Gehm, and Mark A. Neifeld, "Information-theoretic analysis of a stimulated-Brillouin-scattering-based slow-light system," Appl. Opt. 50, 6063-6072 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-32-6063

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