Cedric F. Lam Quotes & Sayings

high.
With the same fiber plant loss budget as in APON, to support the high bit rates, higher power transmitters are used in G-PON to meet the power budget requirements. This also implies that G-PON receivers need to handle higher receiver overload powers and therefore larger dynamic ranges. To ease the requirements and implementation of the upstream OLT burst mode receiver, G-PON has specified a power-leveling mechanism for "dynamic" power control (Sect. 8.3, [15]).
In the power-leveling mechanism, the OLT tries to balance the power it received from different ONUs by instructing ONUs to increase or decrease the launched power. Consequently, an ONU which is closer to the OLT and seeing less loss, will launch at a smaller power than an ONU which is further apart and experiencing more loss. Such concepts of power-leveling or power control have long existed in cellular networks to deal with the near-far cross talk effect and save cellular device battery power. — Cedric F. Lam