Discussion
The physical mechanism behind the operation of an Acousto-optic filters in WDM is the :
Answer: D
Acousto-optic filters work by the photoelastic effect.
An acoustic wave launched into a crystal creates a periodic pattern of compression and rarefaction. Through the photoelastic effect, this strain changes the refractive index periodically, forming a moving diffraction grating. Only light of the wavelength that satisfies the Bragg condition is diffracted, and changing the acoustic frequency tunes the selected wavelength, which is how the filter picks out WDM channels.
The photoelectric effect is the emission of electrons by light, the electro-optic effect is a change of refractive index with an electric field (used in modulators), and electromagnetic effects are not the mechanism here.
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