Fiber-length dependence of slow light with a swept-frequency source
We study the slow light effect via stimulated Brillouin scattering (SBS) using broadly-tunable frequency-swept sources, such as that used in optical coherence tomography. Slow light can be achieved, in principle, over the entire transparency window of the optical fiber (many 100's of nm at telecommunication wavelengths). We demonstrate a SBS slow light delay of more than 1 ns over a wide bandwidth at 1.55 μm using a 2-km-long highly nonlinear fiber with a source sweep rate of 20 MHz/μs and a delay of 10 ns using a 10-m-long photonic crystal fiber with a sweep rate of 400 MHz/μs. We also find that, for a given sweep rate R, there is an optimum value of fiber length L to obtain the largest delay. © 2011 SPIE.
Zhang, R; Zhu, Y; Wang, J; Gauthier, DJ
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