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← ScienceWhich outcome results when an optical fiber's refractive index profile alters its band structure?
A)Increased fiber coupling efficiency loss
B)Enhanced Brillouin gain spectrum uniformity
C)Decreased four-wave frequency-mixing magnitude✓
D)Higher stimulated raman scattering threshold
💡 Explanation
Four-wave mixing decreases rather than increases because phase-matching conditions shift as the band structure changes due to the refractive index; altering the dispersion relation. Therefore, unwanted nonlinear effects are reduced rather than amplified because of adjusted propagation.
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