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Which risk increases when optimizing an arrayed waveguide grating's optical coherence?

A)Reduced chromatic dispersion compensation ability
B)Decreased spatial mode confinement strength
C)Higher thermal expansion mismatch sensitivity
D)Increased stimulated brillouin scattering threshold

💡 Explanation

Increased optical coherence in arrayed waveguides raises sensitivity to variations; interference patterns become more sharply defined; therefore, slight thermal expansion differences cause significant phase shifts, rather than broader interference.

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