The wide-spectrum light source has become the best choice for interferometric fiber optic gyro(I-FOG).Theoretically,the wider the spectral width,the more beneficial to inhibit the Rayleigh scattering error and the Kerr effect error in I-FOG,but if the spectral width is too broad,the stability of the fiber optic gyro scale factor will be affected.It must be addressed how to choose the light source with a suitable spectral width in I-FOG study.For this fact,through analyzing the errors from the Rayleigh scatt...