  We demonstrate the suppression of crosstalk between two dielectric
nanowaveguides by placing an auxiliary linear waveguide between loaded
waveguides spaced by one wavelength. The total cross-sectional dimension of the
system containing two transmission lines is less than two microns that is
hundred times smaller than a cross-section of a system made of dielectric
fiber. The propagating modes in these waveguides are the sum and the difference
of symmetric and antisymmetric modes of the coupled system. Crosstalk is
suppressed by matching the wavenumbers of these modes. The analytically
obtained results are confirmed by numerical simulation.
