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We numerically investigate direct detection of 28- Gbps-class PAM4 signals with receiver-side digital signal processing for bandwidth-efficient short reach optical transmissions, mainly including DD-LMS based linear equalization, 3-tap noise-whitening post filter and BCJR algorithm based MAP detector.
Wideband photonic links suffer not only from the traditional intermodulation distortions (IMD) but also from the cross modulation distortions (XMD) caused by the out-of-band signals, which severely limit the dynamic range of the links. In this paper, we propose and experimentally demonstrate a novel scheme to effectively suppress the cross modulation distortion in the wideband analog photonic link...
We propose and experimentally demonstrate a fast blind CD estimation method based on signal spectrum superposition. With only 4096 samples, a maximum estimation error of 0.25% of the accumulated CD for 7 × 112 Gbps DP-QPSK WDM signal is verified.
A photonic system is proposed to calibrate the instantaneous frequency and glitches of a fast frequency sweeping oscillator using a pseudo random bit sequence (PRBS) frequency comb. Its performance is demonstrated by simulations and experiments. A vector signal generator (Agilent E8257D), whose frequency ranges from 0.5 to 2.5 GHz and from 2.5 to 5 GHz, respectively, is calibrated. The deviation from...
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