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Optical Fiber Communication Conference

Four-fold reduction in the speed of light at practical power levels using Brillouin scattering in a 2-m Bismuth-oxide fiber

C. Jaauregui, Hiroshi Ono, Periklis Petropoulos, David John Richardson

Published Jan 1, 2006• 30 citations
Publisher

Abstract

A 2-m long Bismuth-oxide-based highly-nonlinear fiber is used to generate Brillouin-assisted slow-light. Time delays of 46-ns and a four-fold reduction in the speed of light are achieved for 180-ns pulses with a CW pump power of just ~400-mW.
DOI
10.1109/ofc.2006.216038

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We report the generation of slow light using Brillouin amplification in a short length of highly nonlinear bismuth-oxide fiber. By using just 2 m of fiber, we demonstrate a five-fold reduction in group velocity for$\sim200−nspulses,whichwebelievetobearecordforaslow−lightpropagationinanopticalfiber.Moreover,byvirtueofthehighnonlinearityperunitlengthofthisfiber,weachievethisataverymodestpumppowerlevelofjust200-ns pulses, which we believe to be a record for a slow-light propagation in an optical fiber. Moreover, by virtue of the high nonlinearity per unit length of this fiber, we achieve this at a very modest pump power level of just200−nspulses,whichwebelievetobearecordforaslow−lightpropagationinanopticalfiber.Moreover,byvirtueofthehighnonlinearityperunitlengthofthisfiber,weachievethisataverymodestpumppowerlevelofjust\sim$400 mW and with a low inherent device latency of 14 ns. These results highlight both the merits and practicality of using high nonlinearity nonsilica fibers for slow-light devices.
All-optical tunable slow light technology has promising applications in all-optical network and optical information process. Tunable slow light based on stimulated Brillouin scattering is experimentally investigated, using highly nonlinear microstructured fiber which is designed and drawn by ourselves. The experiment setup is composed of single pump and a single-stage delay. When the pump power reaches 162.6 mW, a maximum delay of 76 ns, equal to 0.76 pulse width, is achieved in the highly nonlinear microstructured fiber of 120 m in length. In addition, by adjusting the pump power, the tunable slow light can be realized. This scheme of slow light has advantages such as large delay, being all-optical tunable and compatible with optical communications systems.
ct: We introduce a new concept for stimulated-Brillouin-scattering-based slow light in optical fibers that is applicable for broadly-tunable frequency-swept sources. It allows slow light to be achieved, in principle, over the entire transparency window of the optical fiber. We demonstrate a slow light delay of 10 ns at 1.55 μm using a 10-m-long photonic crystal fiber with a source sweep rate of 400 MHz/μs and a pump power of 200 mW. We also show that there exists a maximal delay obtainable by this method, which is set by the SBS threshold, independent of sweep rate. For our fiber with optimum length, this maximum delay is ~38 ns, obtained for a pump power of 760 mW.
We show a simple method of time delay enhancement in slow-light systems based on the effect of stimulated Brillouin scattering. The method is based on the reduction of the absolute Brillouin gain by a loss produced by an additional pump laser. With this method we achieved pulse delays of nearly 100 ns in a standard single-mode fiber. In the presented approach the delay or acceleration of optical signals is decoupled from their amplification or attenuation, which allows the adaptation of the pulse amplitudes to the given application.