ALERT: This system is being upgraded on Tuesday December 12. It will not be available
for use for several hours that day while the upgrade is in progress. Deposits to DukeSpace
will be disabled on Monday December 11, so no new items are to be added to the repository
while the upgrade is in progress. Everything should be back to normal by the end of
day, December 12.
Information-theoretic analysis of a stimulated-Brillouin-scattering-based slow-light system.
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.
Type
Journal articlePermalink
https://hdl.handle.net/10161/5103Collections
More Info
Show full item recordScholars@Duke
Daniel J. Gauthier
Research Professor of Physics
Prof. Gauthier is interested in a broad range of topics in the fields of nonlinear
and quantum optics, and nonlinear dynamical systems.
In the area of optical physics, his group is studying the fundamental characteristics
of highly nonlinear light-matter interactions at both the classical and quantum levels
and is using this understanding to develop practical devices.
At the quantum level, his group has three major efforts in the area of quantum communication
and networking. I
Michael E. Gehm
Professor of Electrical and Computer Engineering
Michael Gehm received a B.S. in Mechanical Engineering from Washington University
in St. Louis in 1992. He earned his A.M. and Ph.D. degrees in Physics from Duke University
in 1998 and 2003, respectively. From 2003–2005, he was a Research Associate
in ECE at Duke, followed by a year as an Assistant Research Professor. In 2007 he
was appointed an Assistant Professor of ECE and was jointly appointed an Assistant
Professor of Optical Sciences in 2009. He was promoted to Associate Professor
Alphabetical list of authors with Scholars@Duke profiles.

Articles written by Duke faculty are made available through the campus open access policy. For more information see: Duke Open Access Policy
Rights for Collection: Scholarly Articles
Works are deposited here by their authors, and represent their research and opinions, not that of Duke University. Some materials and descriptions may include offensive content. More info