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We have shown experimentally and confirmed by means of full dimensional (3D+1) numerical simulations, the possibility to create an array of refractive index modification zones inside a fused silica sample using a 43fs, 2mJ, 800nm laser pulse and a periodic mesh introduced in front of the sample. Robust filaments and the corresponding refractive index modification zones preserve their transverse positions for more than 10 Rayleigh lengths (∼500μm). Numerical simulations prove that each mesh unit is an independent source of the background energy for a filament formed within this unit. The effect of the simultaneous formation of many extended periodically spaced filaments can be used to accelerate the fabrication of microoptics devices.