Nowadays there are two kinds of technology for FTTx solution; active and
passive optical network. The former applies active devices like layer2/3
switches as main elements for connecting users in network via optical fiber,
whereas the latter uses passive equipments e.g. splitter to distribute optical
network to users. This article focuses on the Passive Otical Network (PON)
which have several technique. Today the most intersting one shall be Gigabit-
capable Passive Optical Networks (GPON).