Digital SNR Adaptation of Analog Radio-over-Fiber Links Carrying up to 1048576-QAM Signals

Analog radio-over-fiber links have been vulnerable to SNR degradations. We exploit a digital SNR adaptation method by flexibly adjusting the phase modulation index which achieves an SNR range from 29 to 62 dB supporting up to 1048576-QAM signals in a 400G-ZR equivalent coherent system.

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