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← ScienceWhich signal distortion occurs when a high-power laser propagates through optical fiber with nonlinear refractive index?
A)Self-phase modulation broadens pulse✓
B)Chromatic dispersion narrows pulse
C)Brillouin scattering amplifies signal
D)Rayleigh scattering maintains coherence
💡 Explanation
Self-phase modulation occurs because the laser intensity changes the refractive index, thus modifying the phase during propagation. Therefore, the pulse broadens in time rather than narrows due to chromatic dispersion, because the intensity-dependent refractive index modifies the instantaneous frequency.
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