<p>This study introduces a simulated method for detecting matrix cracking and assessing its density in cross-ply laminated composites by using guided Lamb wave propagation and surface-mounted fiber Bragg grating (FBG) sensors. A cross-ply laminated composite with a [0₂/90₆]_s lay-up under antisymmetric guided Lamb wave propagation was simulated using the finite element method. The Lamb wave-induced strain field was obtained along a specified path in the FE models of both intact and damaged composites with matrix cracks. This strain field served as input for the models developed in the FBG-SiMul software, where the time response diagrams of the reflected spectrum from surface-mounted FBG sensors were analyzed. The spectrum parameters, including the oscillation amplitude of the wavelength shift, the mean peak width variation, and the oscillation amplitude of the peak width variation, increased by up to 1000% at an excitation frequency of 200 kHz in the damaged specimen compared to the intact one. The proposed simulated method, combining Lamb wave propagation and FBG sensors, effectively detects matrix cracking damage and assesses its density in laminated composites.</p>