Abstract
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.
Highlights
Facing the exponential growth of the Internet traffic, generation routers will be based on all optical technologies to scale their capacity to the traffic demand
This paper reports on the first demonstration of slow and fast light in optical fibers based on the coupling of two nonlinear effects: narrow band partially degenerated optical parametric amplification (OPA) and stimulated Raman scattering (SRS)
We describe a theoretical analysis and experimental confirmations of controllable tuning of the delay experienced by a 70 ps wide pulse propagating in several lengths of dispersion shifted fiber (DSF) and assess the relationship between fiber length, maximum delay and tuning range
Summary
Facing the exponential growth of the Internet traffic, generation routers will be based on all optical technologies to scale their capacity to the traffic demand. This paper reports on the first demonstration of slow and fast light in optical fibers based on the coupling of two nonlinear effects: narrow band partially degenerated optical parametric amplification (OPA) and stimulated Raman scattering (SRS) Both effects have been used extensively in the past for amplification [13,14,15] as well as for all optical processing devices like wavelength converters with reshaping capabilities [16,17] and ultra fast optical pulse sources [18,19]. It offers sufficiently wide bandwidths to enable the processing of digital data streams at tens of Gbit/s rates as well as picosecond pulses It offers large gain levels and allows for the use of long fibers, in contrast to systems based on absorption resonance where the device length is limited by severe signal amplitude attenuation. Negative delays which amount to fast light were demonstrated
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