Solitons in optical fibers. ultra-short solitons have been generated in glass fibers at wavelength in the anomalous dispersion regions (λ> 1.3 um), where gvd is negative. they were first observed in a 700-m single mode silica glass fiber using pulses from a mode-locked laser operating at a wavelength 1-1.55 um. the pulse shape closely approximated a hyperbolic-secant function with to-4 ps (corresponding to τfwhmf 1.76* τ0-7 ps). at this wavelength: dispersion ps2/km, refractive index n-1.45 and the nonlinear coefficient n2-3 1 9#1 0-20 m2/w calculate a) the peak pulse amplitude ao that satisfy the soliton condition discussed in class; b) the soliton period zp