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Frequency difference between WDM (Wavelength Division Multiplexing) and FDM (Frequency Division Multiplexing) is ________

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Frequency difference between WDM (Wavelength Division Multiplexing) and FDM (Frequency Division Multiplexing) is ________

(a) 1

(b) 0

(c) slightly greater than 1

(d) infinity

The question was posed to me during an online interview.

My question is taken from FDM System topic in chapter Amplitude Modulation of Analog Communications

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Best answer
The correct answer is (d) infinity

The explanation is: WDM (Wave Division Multiplexing) is partly similar to FDM (Frequency Division Multiplexing). FDM is used for signal transmission through a twisted-pair cable while WDM is used to transmit signals through optical fiber cables. Frequency difference between WDM and FDM is infinity.

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