NG-PON1: technology presentation, implementation in practice and coexistence with the GPON system

The paper presents technology of the ten-gigabit-capable Passive Optical Network – XG-PON which in two phases of its development (XG-PON1 and XG-PON2) takes the first step towards the Next-generation Passive Optical Network 1 – NG-PON1. Results of researches and analyses of the development of the fixed broadband optical network are summarized. The focus is on describing the migration process of the Gigabitcapable Passive Optical Network – GPON to NG-PON1. The migration to the new technology is sensible only if related to technological improvements that enable enhanced services and if the investments needed for migration are cost-efficient. Arrival of a new technology is always characterized by a certain range of changes in the existing system, therefore, the purpose of the paper is to answer the questions what is the scope of changes needed in the existing passive and active elements and which new elements need to be added. In relation to this, special attention is given to coexistence of GPON and NG-PON1. It is shown that for coexistence of the GPON and NG-PON1 systems using wavelength blocking filters – WBF based on the Thin Film Filter – TFF and Wavelength Division Multiplexing – WDM splitters is a cost-efficient and technologically adequate solution.