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European Conference on Optical Communication

Tunable all optical delay via slow and fast light propagation in a narrow band Raman assisted optical fiber parametric amplifier

David Dahan

Published Jan 1, 2005• 0 citations
Publisher

Abstract

We report the first demonstration of slow and fast light in optical fiber using narrow band Raman assisted optical parametric amplification. A tunable delay of up to 162 ps was obtained for a 70 ps pulse. (4 pages)
DOI
10.1049/cp:20050399

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•Jan 1, 2007•0 citations
We propose and demonstrate the use of narrow band optical parametric amplification for tunable slow and fast light propagation in optical fibers. The parametric gain is coupled to the Raman process which changes the gain value moderately but modifies the gain spectral shape. Consequently, the delay is enhanced at short wavelengths while it is moderated at long wavelengths. The maximum delay and tuning range can be optimized with respect to each other considering saturation effects in long fibers. The proposed scheme offers tunable delay in the presence of gain and with a bandwidth which is sufficiently wide to process digital data streams at tens of Gbit/s rates as well as picoseconds pulses.
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We theoretically study parametric amplification in highly birefringent optical fibers and show that large tunable optical delay or advancement can be achieved via slow and fast light propagation. We provide a clear derivation of the formula for the optical delay that originates from the imaginary part of the parametric gain. We also perform numerical simulations in both normal and anomalous dispersion regimes. In the latter case, results show that large nanosecond optical delay could, in principle, be obtained at 1550 nm in a 1-km-long polarization-maintaining fiber. We further demonstrate that the optical delay and advancement rely on a group-velocity locking between the two cross-polarized signal and idler pulses.