  We systematically present experimental and theoretical results for the
dual-wavelength switching of 1560 nm, 75 fs signal pulses (SPs) driven by 1030
nm, 270 fs control pulses (CPs) in a dual-core fiber (DCF). We demonstrate a
switching contrast of 31.9 dB, corresponding to a propagation distance of 14
mm, achieved by launching temporally synchronized SP-CP pairs into the fast
core of the DCF with moderate inter-core asymmetry. Our analysis employs a
system of three coupled propagation equations to identify the compensation of
the asymmetry by nonlinearity as the physical mechanism behind the efficient
switching performance.
