This paper covers the design and operation of a new mode scrambler for polymer optical fibers. This scrambler enables the rapid achievement of the equilibrium mode distribution without incurring significant insertion loss. Its main other features are small size and a costeffective design, making it very easy to build, configure, and operate. A numerical model based on geometrical optics is developed to understand the behavior of the scrambler, assess its overall performance, and help optimize its configuration. Results obtained through numerical simulation are then validated through experiments.