This section describe physical layer requirement for FTTH GPON network in three perspective, 1, Spectral Width,2. Attenuation Range, 3. ODN topology, etc. 1 Spectral width [ITU-T G.984.2] defines certain PMD specifications for the OLT and ONU. For a GPON system operating at 2488 Mbps downstream rate and 1244 Mbps upstream…
Introduction to XGS-PON 10 Gigabit capable symmetric passive optical network
Recommendation ITU-T G.9807.1 describes a 10-Gigabit-capable symmetric passive optical network (XGS-PON) system in an optical access network for residential, business, mobile backhaul and other applications. This system operates over a point-to-multipoint optical access infrastructure at the nominal data rate of 10 Gbit/s both in the downstream and the upstream directions.
XGS-PON systems are able to operate on the same optical distribution network (ODN) as XG-PON systems. The XGS-PON systems are capable of operating at the same wavelengths as an existing XG-PON system or operating at the gigabit-capable passive optical network (G-PON) wavelengths. Co-existence of XGS-PON with G-PON, 10-gigabit passive optical network (XG-PON) and next generation passive optical network 2 (NG-PON2) is supported.
Maximal reuse of existing ITU-T PON Recommendations is made. The XGS-PON transmission convergence (TC) layer is based on the NG-PON2 and XG-PON TC layers. No hardware-affecting modifications to the TC-layers are needed. It is expected that TC layer devices designed for time and wavelength division multiplexing (TWDM) PON will be able to operate as XGS-PON TC layer devices. The downstream optical physical medium dependent (PMD) specifications are derived from the XG-PON PMD.