Abstract
This paper focuses on upstream signaling in TWDM-PON (one of the two systems
specified in the new series of ITU-T G.989.x Recommendations for NG-PON2), for what
concerns the discovery phase of a new ONU. The key idea is that a new ONU, that needs to
be discovered by the OLT, would send a low bit rate signal that is set to a sufficiently
low-power level to not affect significantly the upstream transmission performance of
already active ONUs. We properly dimension the key physical layer parameters of this
technique and demonstrate it experimentally. We named this proposal as “photon ranging”
due to its ultralow-power transmission and we experimentally demonstrate its
feasibility. As a “side effect” of this study, we had to deeply revise the power penalty
generated by the optical interferometric crosstalk, the main impairment that impacts the
proposed setup, obtaining new results that may be of interest also in areas not directly
related to the specific framework of TWDM-PON.
© 2015 OAPA
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