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← ScienceWhich mechanism limits the bandwidth of an optical waveguide?
A)Material dispersion broadens pulse signaling✓
B)Fresnel reflection distorts mode impedance
C)Brewster's angle prevents total reflection
D)Photoelectric effect diminishes signal gain
💡 Explanation
Material dispersion broadens optical pulses traveling through the waveguide because different wavelengths propagate at distinct velocities due to refractive index variation; therefore signal overlap limits system bandwidth, rather than the other optical phenomena.
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