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Nyquist-mPPM-LQAM is proposed, theoretically analyzed, and experimentally demonstrated for power- and spectrum-efficient optical modulation. Based on Nyquist shaping, Nyquist-mPPM-LQAM halves the occupied bandwidth with doubled spectrum efficiency compared with mPPM-LQAM. Taking Nyquist-4PPM-QPSK as an example, a receiver sensitivity of −49.8 dBm at BER of 1e-3, corresponding to a calculated power...
Performance of 28 Gbit/s 4PPM-QPSK, Nyquist-4PPM-QPSK, QPSK and Nyquist-QPSK are investigated in unrepeatered transmission links. It is found that the maximum reach of Nyquist-4PPM-QPSK outperforms QPSK (@BER=1E−3) under the same spectrum efficiency.
Demultiplexing of a 160 Gbaud N-OTDM signal to 40 Gbaud is experimentally demonstrated using a commercially available IQ modulator. 6.8 dB required-OSNR improvement (@BER=1E-4) is observed compared with Gaussian sampling with the same pulse-width.
Nyquist-mPPM-QPSK modulation format is proposed with high power efficiency and doubled spectrum efficiency compared with mPPM-QPSK, in particular, a 1.3dB power efficiency advantage over QPSK using Nyquist-4PPM-QPSK is demonstrated under the same spectrum efficiency.
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