74 research outputs found
Theory of Slow Light Enhanced Four-Wave Mixing in Photonic Crystal Waveguides
The equations for Four-Wave-Mixing in a Photonic Crystal waveguide are
derived accurately. The dispersive nature of slow-light enhancement, the impact
of Bloch mode reshaping in the nonlinear overlap integrals and the tensor
nature of the third order polarization are therefore taken into account.
Numerical calculations reveal substantial differences with simpler models,
which increase with decreasing group velocity. We predict that the gain for a
1.3 mm long, unoptimized GaInP waveguide will exceed 10 dB if the pump power
exceeds 1 W.Comment: 6 pages, 4 figures; submitted to Optics Expres
Realization of wavelength conversion with hyperbolic secant femtosecond pulse in normal dispersion regime
Realization of wavelength conversion based on second-order femtosecond dark solitons with hyperbolic secant pulse is presented. This is achieved by introducing localized dispersion perturbation along the optical fiber. We demonstrate that an initial 30 fs second-order pulse decays to similar sub-pulses by applying perturbation using a step increment of β2 from 6.3 to 15.75 ps2 km-1. This shows that the realization of a 12 channel wavelength converter for femtosecond pulses is possible. Recent research shows the possibility of realizing wavelength conversion generated from picosecond solitons neglecting nonlinear effects. However, employing the same method for femtosecond pulses fails due to the manifestation of nonlinear effects. In this paper, pulse deformation under different levels of perturbation was tested, and appropriate perturbation leading to similar sub-pulses is achieved
Observations of four-wave mixing in slow-light silicon photonic crystal waveguides
Four-wave mixing is observed in a silicon W1 photonic crystal waveguide. The
dispersion dependence of the idler conversion efficiency is measured and shown
to be enhanced at wavelengths exhibiting slow group velocities. A 12-dB
increase in the conversion efficiency is observed. Concurrently, a decrease in
the conversion bandwidth is observed due to the increase in group velocity
dispersion in the slow-light regime. The experimentally observed conversion
efficiencies agree with the numerically modeled results.Comment: 12 pages, 6 figure
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