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A 125Gbit/s single polarization half-cycle 32QAM Nyquist-SCM signal transmission over 2km was experimentally demonstrated using EML and direct detection with a receiver sensitivity of −5.2dBm at BER=3.8×10−3 over 2km of SSMF for short reach communications.
We propose a novel technique for modulation format identification (MFI) in digital coherent receivers by applying deep neural network (DNN) based pattern recognition on signals’ amplitude histograms obtained after constant modulus algorithm (CMA) equalization. Experimental results for three commonly-used modulation formats demonstrate MFI with an accuracy of 100% over a wide optical signal-to-noise...
We experimentally demonstrated a novel frequency offset compensation method with the widest estimation range by inserting one pilot-tone at the center of the OFDM spectrum.
We propose a scheme on broadband multi-wavelength light source generation based on phase modulation in a ring. 125-channel light source with channel spacing of 10-GHz is demonstrated using a single phase modulator in a loop.
We experimentally demonstrate a novel decision-aided maximum likelihood phase estimation in an 8-Channel 42.8-Gbit/s DWDM coherent PolMux QPSK system. The results show that our proposed algorithm can achieve a comparable performance as the Mth-power while having much lower computational complexity.
We investigate the impact of off-center optical filtering plus electronic equalization for 10-Gb/s directly-modulated systems. Simulation results show the transmission distance over standard single-mode fiber is increased >6-times (from <25-km to >150-km) without optical dispersion compensation.
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