Evolution of light trapped by a soliton in a microstructured fiber

School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, UK.
Optics Express (Impact Factor: 3.49). 09/2009; 17(16):13588-600. DOI: 10.1364/OE.17.013588
Source: arXiv


We observe the dynamics of pulse trapping in a microstructured fiber.
Few-cycle pulses create a system of two pulses: a Raman shifting soliton traps
a pulse in the normal dispersion regime. When the soliton approaches a
wavelength of zero group velocity dispersion the Raman shifting abruptly
terminates and the trapped pulse is released. In particular, the trap is less
than 4ps long and contains a 1ps pulse. After being released, this pulse
asymmetrically expands to more than 10ps. Additionally, there is no disturbance
of the trapping dynamics at high input pulse energies as the supercontinuum
develops further.

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    • "In the spectral domain, this results in the frequency conversion of the probe wave at ω P into a reflected wave (RW) at ω = ω R that satisfies the phase-matching (PM) condition [4] [5] [6] D(ω) = D(ω P ), (1) where D(ω) = β(ω) − β(ω S ) − β 1 × (ω − ω S ) denotes the wave number in a reference frame moving with the soliton, β(ω) is the fiber propagation constant and β 1 = ∂ ω β(ω S ) is the group velocity at the soliton frequency ω S . The analogy between event horizons and the nonlinear reflection of a weak probe onto a soliton has attracted much interest over the past few years and opens innovative perspectives in the control of light [7] [8] [9] [10], in quantum physics [11] [12], as well as in superfluidity [13]. The few nonlinear optics experiments on the subject were performed by causing the collision of an intense soliton with a weak probe carefully adjusted at the fiber input in terms of power, wavelength detuning, and delay [1,3,14–16]. "
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    ABSTRACT: A traditional view on solitons in optical fibers as robust particlelike structures suited for information transmission has been significantly altered and broadened over the past decade when solitons have been found to play the major role in generation of octave broad supercontinuum spectra in photonic crystal and other types of optical fibers. This remarkable spectral broadening is achieved through complex processes of dispersive radiation being scattered from, emitted, and transformed by solitons. Thus solitons have emerged as the major players in nonlinear frequency conversion in optical fibers. Unexpected analogies of these processes have been found with dynamics of ultracold atoms and ocean waves. This Colloquium focuses on recent understanding and new insights into physics of soliton-radiation interaction and supercontinuum generation.
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Christopher Kuklewicz