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PON Processing Technology

The complexity of PON lies in signal processing technology. PON In the downstream direction, the signal sent by the switch is broadcast to all users. In the uplink direction, each ONU must use a multiple access protocol such as time division multiple access TDMA (Time Division Multiple Access) protocol to complete the shared transmission channel information access.

The PON system structure is mainly composed of the Optical Line Terminal (OLT), the optical distribution network (ODN) including the passive optical device, PON the optical network unit / optical network terminal (ONU / ONT Optical) Network Unit / Optical Network Terminal), the difference between the ONT directly on the client side, PON and ONU and the user there are other networks, such as Ethernet) and the network element management system (EMS) composition, usually point to multipoint Tree topology.

The PON system structure is mainly composed of the Optical Line Terminal (OLT), the optical distribution network (ODN) including the passive optical device, PON the optical network unit / optical network terminal (ONU / ONT Optical) Network Unit / Optical Network Terminal), the difference between the ONT directly on the client side, PON and ONU and the user there are other networks, such as Ethernet) and the network element management system (EMS) composition, usually point to multipoint Tree topology.

Traditional PON system downlink data stream using broadcast technology, uplink data stream using TDMA technology to solve the multi-user signal in each direction of the multiplexing problem. Traditional PON technology uses WDM technology, in the optical fiber to achieve single-fiber two-way transmission, PON to solve the two directions of signal multiplexing transmission. PON generally consists of light line terminal (OLT), optical splitter (ODU), user terminal (ONU) three parts. Currently widely used PON technology, including EPON and GPON two mainstream technologies, EPON uplink and downlink bandwidth are 1.25 Gbit / s, GPON downlink bandwidth of 2.5 Gbit / s,PON uplink bandwidth of 1.25 Gbit / s.

PON passive optical fiber network abbreviation, compared with the active optical access technology, PON due to the elimination of the central office and the client between the active equipment, making maintenance simple, high reliability, low cost, and can save Fiber resources, PON is the future of FTTH the main solution. With the gradual reduction of PON cost, not only in the FTTB / FTTC occasions PON has a certain application market, PON and the use of PON to achieve FTTH in Japan and other developed countries have made great progress. At present, PON technology mainly has APON, PON EPON and GPON and so on, the main difference lies in the use of different two-tier technology.


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