Most nonlinear effects can be reduced by using a fiber with a large effective mode area, as this leads to lower optical intensities for a given power level. However, the power threshold for critical self-focusing does not depend on the mode area. The only worries that plagued optical fiber in the early day were fiber attenuation and, sometimes, fiber dispersion; however, these issues are easily dealt with. The DSF fiber presents the smallest effective area among the line fibers. Distributed analysis of nonlinear wave mixing in fiber due to forward Brillouin scattering and Kerr effects YOSEF LONDON, HILEL HAGAI DIAMANDIa, GIL BASHAN,AND AVI ZADOK Faculty of Engineering and Institute of Nano-Technology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel.