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A novel phase-locked coherent demodulator, based on a sampling phase-locked loop, is presented and investigated theoretically. The demodulator is capable of operating at high-frequencies, by using optical sampling to downconvert the high-frequency input RF signal to the frequency range of the baseband loop. We develop a detailed theoretical model of the (sampling) phase-locked coherent demodulator...
To obtain higher linearity in an analog photonic link, a novel coherent receiver design with feedback is proposed and demonstrated, where the linearity and signal-to-noise-ratio (SNR) tradeoff associated with a traditional phase demodulator can be eliminated. The local phase modulator in the feedback loop of the receiver tracks the phase change of the incoming signal and reduces the effective swing...
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