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We propose a novel frequency-quadruple two-tone signal generation method using a DP-QPSK modulator which compensates for high-order harmonics, and carrier of the generated signal. In the experiment, the two-tone signal was successfully generated, suppressing the power level of distortion components to 24-dB smaller than the required signal.
We studied a novel compensation scheme using digital signal processing based on a neural network (NN). The performance of a three-layer NN was investigated using 16QAM signals distorted by chromatic dispersion and SPM, achieving BER less than 10−6
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