Demonstration of symmetrical 25 Gbps quaternary PAM/duobinary TDM-PON with multilevel interleaving of users

A cost effective symmetrical 25 Gbps TDM-PON utilizing a novel multilevel user-interleaving scheme based on PAM-4 in the downstream and 3-level duobinary modulation in the upstream using exclusively 10 Gbps parts at the ONU is demonstrated.

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