PON is a shorthand for Passive Optical Network.PON means that the optical distribution network does not contain any electronic devices and electronic power supplies. The ODNs are all composed of passive components such as Splitter, and do not require expensive active electronic devices. A passive optical network consists of an OLT installed at the central control station and a set of supporting ONUs installed at the user’s premises. The ODN between the OLT and the ONU contains fiber optics as well as passive splitters or couplers.
The physical structure of the PON is usually tree-shaped and mainly includes three types of equipment: Optical Splitter, Optical Line Terminal, and Optical Network Unit. The following figure shows the PON topology: the OLT is located at the central office and is responsible for managing and controlling the ONU. The ONU is located at the user end and is mainly used to access the user. The OS is located between the OLT and the ONU, connecting the OLT and the ONU to complete the N-split function. Implement an interconnection between an OLT and N ONUs
Advantages of PON:
1) Relatively low cost, simple maintenance, easy to expand, and easy to upgrade. The PON structure does not require power supply during transmission, has no electronic components, so it is easy to lay, basically no maintenance, and long-term operation cost and management cost are greatly saved.
2) Pure media network. Passive optical network is a pure medium network, completely avoiding the effects of electromagnetic interference and lightning, and is very suitable for use in areas with poor natural conditions.
3) PON system has very little occupation of central office resources, low initial investment, easy expansion and high return on investment.
4) Provide very high bandwidth. EPON can currently provide 1.25Gb/s bandwidth for uplink and downlink symmetry, and can be upgraded to 10Gb/s with the development of Ethernet technology. GPON is up to 2.5Gb/s bandwidth.
5) A large range of services. As a point-to-multipoint network, PON saves CO resources and serves a large number of users in a fan-shaped structure. The way users share central office equipment and fiber optics saves user investment.
6) Flexible bandwidth allocation and guaranteed quality of service (QoS). The G/EPON system has a complete system for bandwidth allocation and guarantee. User-level SLAs can be implemented.
RicherLink has mature and advanced technologies in PON access technology, implementing and deploying PON FTTH (Fiber to the Home) for customers to help customers quickly achieve low-cost broadband network access.