Which risk greatly increases when quadrature amplitude modulation (QAM) symbol constellations are transmitted through nonlinear fiber optic channels and strong laser signal?

💡 Explanation

Signal constellation points distort because of Cross Phase Modulation (XPM), altering phase relationships within the QAM scheme. Therefore, points become difficult to discern by a demodulator, rather than other impairments, which may have alternative causes under different environmental constraints.

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