2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/199485Waveguides can be employed to test non-linear effects in electrodynamics. We solve Born-Infeld equations for TE waves in a rectangular waveguide. We show that the energy velocity acquires a dependence on the amplitude, and harmonic components appear as a consequence of the non-linear behavior.3 pages. To appear in PRLHigh Energy Physics - TheoryOpticstext