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← ScienceWhich optical consequence arises in fiber Bragg gratings modulating laser wavelength?
A)Stimulated Brillouin scattering narrows spectrum
B)Nonlinear self-focusing increases numerical aperture
C)Distributed feedback creates wavelength selectivity✓
D)Four-wave mixing disrupts pulse amplification
💡 Explanation
Distributed feedback causes wavelength selectivity in fiber Bragg gratings exposed to laser light because multiple reflections and interference enhance specific wavelengths rather than others. Therefore, the laser's wavelength sharpens by spectral filtering, not by self-focusing or scattering effects.
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