Fig. 1. OptiSystem simulation model of laser spectrum broadening system

Fig. 2. The original spectrum of CW Laser beam

Fig. 3. The spectrum evolution of laser signal with modulation depth increasing

Fig. 4. Spectra of laser beams with the same signal power

Fig. 4. Spectra of laser beams with different signal power spectral densities

Fig. 4. Spectra of laser beams with different signal bandwidths

Fig. 5. Broad spectral component linewidth and residual carrier fraction of different!signal power spectral densities and cutoff frequencies

Fig. 6. Schematic diagram of external phase modulation system

Fig. 7. Schematic diagram of laser wavelength stability test system

Fig. 8. Comparison of spectra of laser beam with and without modulation

Fig. 9. Spectra of laser beam with different signal bandwidths

Fig. 9. Gaussian white noise signals with and without filtering

Fig. 10. Gaussian white noise signals of different attenuations

Fig. 10. Spectra of modulated laser beam with different signal attenuations