The coming NG-PON1 is expected to co-exist with the deployed GPON and GEPON. They typically employee more wavelengths to support Video, TV and OTDR applications. In the mean time, they often prompt higher TDM bit rate (2.5g to 10g).
These designs then needs more complicated WDM features to manage the Wavelengths of the NG-PON1. The current triplexiers and biplexiers will be used to manage both upstream and downstream wavelength for ONU. But the ODN (optical distributed network) will need new WDM modules to work with the PLC splitters.
Background
IEEE 10G EPON
10G EPON was formally standardized and published in the IEEE 802.3av in September 2009. The IEEE 802.3av task force focused on defining a new physical layer, keeping the MAC, MAC control and all the layers above unchanged to the greatest possible extent. The 802.3av standard has two core features: it expands the uplink/downlink bandwidth of the 802.3ah standard to 10Gbps, and it has good compatibility, allowing for the coexistence of 10G EPON ONU and 1G EPON ONU on the same ONU. This provides maximum protection of the operator’s investment. 10G EPON—an NG-PON technology featuring high bandwidth and good compatibility—will be widely employed in the next few years.
FSAN/ITU-T NG-PON
NG-PON is defined in the ITU-T G.987 series. NG-PON standardization is currently being accelerated and all documentation on XG-PON1 standards are expected to be published in 2011. The evolution of NG-PON can be divided by FSAN/ITU-T into two phases: NG-PON1 and NG-PON2. NG-PON1 is a mid-term upgrade from the GPON system, and is backwardly compatible with existing fiber installations. It can be further divided into two generations: XG-PON1 and XG-PON2, which are differentiated by the uplink data rate. NG-PON2, on the other hand, is a long-term solution with an entirely new optical network type, e.g. a pure WDM PON.
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