2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/91195Quantum fluctuations of optical fiber Bragg grating solitons are investigated numerically by the back-propagation method. It is found for the first time that the bandgap effects of the grating act as a nonlinear filter and cause the soliton to be amplitude squeezed. The squeezing ratio saturates after a certain grating length and the fundamental Bragg soliton produces the optimal squeezing ratio.3 pages, 2 figures, submit to Optics LettQuantum Physicstext