How to view the development trend of GPON Optical Fiber Access Network

There are many things worth learning about the GPON optical fiber access network. Here we mainly describe how to view the development trend of the GPON optical fiber access network. The development of optical fiber access networks has become an inevitable trend. GPON optical fiber access networks have obvious advantages in terms of physical access speed, bandwidth efficiency and optical separation ratio, full service carrying capacity, and security, this article will explore the development trend of GPON optical fiber access networks based on the current industry development.

"Large Capacity and fewer bureaus" have become the construction trend of the light access Era

The access network is the most important asset for fixed network operators. Generally, it accounts for 60 ~ 70%. In terms of operating costs, GPON optical fiber access network also accounts for the vast majority of fees. Currently, fixed network operators are mainly engaged in copper access. Due to the limited access distance of DSL technology, the number of users accessing each access point is very limited, this leads to a large number of fixed Website access points in a city, resulting in a significant increase in maintenance and support costs.

The optical fiber access distance is much longer than the traditional twisted pair wires. For example, the optical fiber access network based on PON can reach 20 km. By improving the optical transmission power or extending technology, the distance can reach 60 km, so the idea of building a network with large capacity and few residences in the traditional switch age is back in the era of optical access network, but the TCO of optical access is wider, larger capacity, fewer sites are required, or even 80% of the number of sites can be reduced. Therefore, to address the current multi-Bureau problem of access to the transmission network, the precision reduction node becomes an important measure for operators to optimize the network in the future, Saving network investment and maintenance costs.

Further build a "flat integrated optical access network"

The traditional network architecture, residential users, small and medium-sized enterprises, and base station access are all vertical networks. Each network is independent and called a chimney network. The new GPON-based optical fiber access network, with its large capacity, long distance, and full-service support capabilities, allows us to optimize and improve the original construction model from the perspective of the entire network, the original chimney-type network is converted into a flat integrated network. One network can meet the full service access needs of residential buildings, enterprises, and mobile base stations, so that three networks can be converted into one network, at the same time, the integration of the access layer and the aggregation layer makes the network flat. The network is changed from Layer 3 to Layer 2, which reduces the device types and quantity, improves network reliability, and greatly reduces the construction of data centers, as shown in TCO1 ).

High-capacity and small-board companies require ultra-high bandwidth and ultra-large split ratio

As mentioned above, the GPON optical fiber access network is a large-capacity, small-office, and integrated full-service access network, which requires that the OLT device has a basic characteristic that the capacity is very large and covers more users. Taking a densely populated city as an example, the number of users per square kilometer is about 1000. Even if one OLT only covers 5 km million users, it also needs to support 25 thousand million users. Therefore, in cities with high population density, the OLT must support eight or even 16 PON ports per board, usually with 16 slots). In this way, each GPON optical fiber access network has a valid bandwidth of 2 to 3 GB.

Let's take a look at why the network construction in the FTTH scenario requires ultra-large optical splitting ratio. During FTTH Network Construction, the ODN network accounts for 50 of the total network investment ~ 70%. In densely populated cities, an OLT data center needs to cover tens of thousands or even 0.1 million FTTH users, and a large number of optical fibers need to be laid from the data center to the residential area, in this case, the PON splitting ratio directly affects the investment scale of the ODN network. The 1: 64 splitting ratio supported by OLT is nearly 30% lower than the 1: 32 splitting ratio required for the ODN network investment. With the increasing OLT capacity, the next generation PON technology must provide a larger branch capacity of or even to reduce network construction costs.

Differentiated Services enable full-service access

At present, broadband access mainly relies on access fees, and the income of broadband applications is very small. As broadband users gradually become saturated and competitive, bandwidth is less attractive to customers. The GPON optical fiber access network is used as a service awareness service. It supports hierarchical charging services based on different service levels for residential users, attracts customers with bandwidth, and retains customers with high QoS. This service can be used for access between enterprise users and mobile base stations, network devices support H-QoS and strict network-level and device-level security features, providing enterprise users with bandwidth and network security assurance. These are the inevitable trend of FTTx network development. The Development Trend of broadband access includes new access technologies and the cooperation of new gateway devices. Only the home gateway can integrate and control a variety of unrelated technologies on a single device to achieve the convergence of networks and devices.