A method for creating a composite material for fabricating an optical fiber. The method includes selecting multiple constituents and a concentration for each constituent, conceptually dividing a unit length model rod into a number of segments, computing origin locations for the segments, computing a longitudinal acoustic velocity for an assumed composite material, computing a photoelastic constant for the assumed composite material, computing an acoustic frequency for the assumed composite material, computing an acoustic attenuation coefficient for the assumed composite material, computing a Brillouin Spectral Width for the assumed composite material, and computing a Brillouin Gain Coefficient for the assumed composite material. if the computed Brillouin Gain Coefficient is greater than a preselected value, repeating the above, otherwise, mixing the constituents at an appropriate temperature. The number equals the number of constituents, and each segment is associated with a separate one of the constituents.