Discussion
Grating based demultiplexers use the phenomenon of .............. from an optical grating.
Answer: A
Grating demultiplexers use diffraction (Bragg).
A diffraction grating sends each wavelength in a different direction, given by the grating equation, so the wavelengths combined in a WDM signal are spread out in angle and can be collected by separate output fibres. Fibre Bragg gratings use the same principle along the fibre, reflecting a narrow band around the Bragg wavelength.
Scattering spreads light in random directions without separating wavelengths in a controlled way, and plain reflection or transmission does not separate wavelengths at all.
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