Which limitation appears when exceeding the Nyquist rate in Time-Division Multiplexing (TDM) optical fiber communication?

💡 Explanation

Exceeding the Nyquist rate in TDM causes intersymbol interference because the *sampling theorem* prevents accurate reconstruction of separated signals presented at too great a rate in each time slot. Therefore, symbols overlap, rather than remaining discrete; differently, thermal noise increases with higher optical power.

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