altLiekki (Reston, VA) offers Liekki Application Designer (LAD) v3.1 software for power fiber laser and amplifier simulation. It includes tools for designing systems employing large mode area fibers. Using multimode propagation, the software can calculate the optical power propagation along the doped fiber for each mode in multimode fibers. The user can then evaluate the quality of the output optical beam. LAD v3.1 can calculate the modes for any refractive index profile having radial symmetry. The optical fiber is bent either for packaging purposes or to discriminate against higher order modes. The software features the bending effects in calculations including mode field distortion and power loss, and features radial doping, transient calculations, Monte Carlo analysis, and nonlinear effects threshold power.