Which outcome occurs when a quadrature amplitude modulation (QAM) signal experiences excessive phase jitter in a coherent optical receiver?

💡 Explanation

Increased phase jitter disrupts QAM signal constellation decoding because phase noise broadens the received signal, causing symbols to overlap via inter-symbol interference: phase recovery fails, therefore receiver cannot accurately demodulate the signal, rather than boosting optical power or correcting other distinct impairments.

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