Using laser light source instead of traditional wide-spectrum light source in fiber optical gyroscope(FOG)can improve the performance and reduce the cost.However,in order to suppress various coherent errors introduced by laser light source,it is necessary to expand the linewidth of laser light source.Firstly,the method of broadening the laser light source linewidth based on Gaussian white noise external phase in modulation is theoretically analyzed,and a spectral broadening convolution model is established.Secondly,the effect of the external phase modulation of Gaussian white noise on the linewidth broadening of laser light source is verified by the method of delayed self-heterodyne interferometry measurement.Finally,based on simulation analysis conclusions,a laser linewidth broadening light source device is constructed,which broadened the spectrum of the laser light source to a linewidth of 20 GHz.It is applied to fiber optic gyroscopes and the scaling factor performance is verified through experiments,providing a theoretical basis for the application of laser light sources in fiber optic gyroscopes and having certain engineering application value.
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