We demonstrated a 40-Gb/s TDM-PON over a 42-km, 64-split fiber plant using optical duobinary modulation. In the ONU, a 25 Gb/s APD-based receiver was used for a cost-effective and low-power-consumption upgrade of TDM-PON. Experimental results show that our system supports 31 dB of power budget for a differential reach of 26 km at 1550 nm without DSP. Results of simulations to investigate optimization of the transmission performance are also presented.
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Veen et al. (2015) studied this question.