The optical access network is currently driving studies on transmissions beyond 10 Gbit/s.\nThis paper reports an analysis of Pulse Amplitude Modulation (PAM), seen as a promising\ncandidate for future Passive Optical Networks (PON). Previous 25 Gbit/s real-time PAM4 results are\nextrapolated here with simulations to higher bit rates and a higher number of PAM levels. Our main\ngoal is to evaluate the compliancy of PAM with the existing standards and legacy networks as far\nas fiber length, optical budget class, and wavelength plan are concerned. The simulations enlighten\nus as to the challenges of multilevel modulation formats, such as noise and jitter, compared to the\ncurrently adopted Non-Return-to-Zero (NRZ).
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