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For the upstream passive optical network (PON), we design and evaluate an intensity modulation quaternary pulse amplitude modulation (PAM-4) with the four coherent receivers in terms of Homodyne coherent and balanced detection in polarization multiplexing. The obtained simulation results validate the 100Gbps coherent upstream PAM-PON scheme with the successful transmission over the C-band standard single mode fiber.
Wang et al. (Mon,) studied this question.