At present, in the aspect of optical fiber access network technology, narrowband access is gradually replaced by broadband access, and finally realize fiber to home. Broadband optical fiber access network becomes inevitable, and PON technology will become the technical hotspot of broadband access network in the future because of its multi-service, low investment and easy maintenance.
Optical fiber access network refers to the access network in which the transmission medium is optical fiber. Optical fiber module types access network can be divided into two categories technically: active optical network (AON,ActiveOpticalNetwork) and passive optical network (PON,PassiveOpticalNetwork).
Active optical network can be divided into SDH-based AON and PDH-based AON.
Passive optical networks can be divided into narrowband PON and broadband PON.
The information network is composed of core backbone network, metropolitan area network, access network and user resident network, and the access network is located in the bridge of metropolitan area network / backbone network.
At present, science and technology are advancing by leaps and bounds, a large number of electronic documents continue to be produced, with the economic globalization, the acceleration of social information process, the massive popularity of the Internet, the fierce growth of data services, and the continuous expansion of telecommunications services. GPON manufacturers have expanded from a single telephone service to a variety of services. Narrowband access network has become a bottleneck restricting the development of broadband network. The market capacity of access network is very large, in order to meet the needs of users, new technologies continue to emerge. Access network is the focus and key of the development of national information infrastructure, and network access technology has become the focus and investment focus of research institutions, communication manufacturers, telecom companies and operation departments.