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← ScienceWhich effect increases when optical fiber attenuation grows longer?
A)Pulse broadening via mode dispersion✓
B)Signal gain through stimulated emission
C)Refractive index reduces non-linearly
D)Total internal reflection becomes complete
💡 Explanation
Increased fiber length causes pulse broadening because mode dispersion accumulates over distance; the mechanism is that different modes propagate at slightly shifted speeds causing pulse spreading. Therefore pulse broadening worsens, rather than signal gain improving or other reflective properties dominating outside the pulse.
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