Fiber Optic Splice Closure is one of our products. Let me introduce the rise of fiber access in the development of fiber optic communication.

　　The development of copper access network to optical fiber access network

　　Point-to-point (P2P) optical network shrink access

　　Through the introduction in Chapter 1, we found that due to the increase in bandwidth demand, the length of the copper cable is shortened, and the optical fiber continues to extend to the user side until the optical fiber extends directly to the user's home. In this form, the early optical fiber to the home is formed, that is, the user and the CO equipment room are connected by an independent optical fiber to form a point-to-point optical network, and the user also belongs to the private line to access the home at this time.

　　The advantage of point-to-point (P2P) is that it can fully meet the needs of customers with competition, and has good business isolation and security. However, since the fiber is only used by one user, the utilization rate of the fiber is very low, so this solution is generally only used when the user is divided and the user density is extremely low, obviously. For most areas at present, the density of users far exceeds the design access capability of this method. Therefore, if this method continues to be used in high user gathering places, it will lead to unfavorable factors such as insufficient capacity of the central office equipment, a large increase in the outlet density, and an excessively large area of ​​the wiring room.

　　Point-to-point (P2MP) optical network shrink access

　　Due to the limitations of point-to-point, optical network access has developed a tree-structured network topology, that is, point-to-multipoint (P2MP) fiber access network to solve point-to-point fiber. Due to the limitations of point-to-point, optical Network access has developed a tree-structured network topology, namely point-to-multipoint (P2MP) fiber access network to solve point-to-point fiber

　　Disadvantages of access. Compared with the point-to-point access method, the P2PM method can save more than 50% of optical fibers and modules. The point-to-multipoint network is further divided into an active optical network (AON: Active Optical Network) and a passive optical network (PON: Passive Optical Network).

　　Active network refers to the use of streamer transmission equipment from central office equipment (CO) to user distribution nodes, such as optical switches and active optoelectronic devices. However, the network deployment and maintenance costs of active equipment are relatively high. And because the location of active equipment is often on the side of the road, it is also difficult to get power from the roadside in order to supply power to the active equipment.

　　Due to the disadvantages of active networks, with the development of technology, a sugar-free point-to-point access network has been introduced, that is, the optical fiber lines from the computer room to the users are all passive, and the optical signals of the trunk lines are physically split through passive devices in the middle. into the user's home. Compared with the active network, the passive network saves the active optical transceiver and exempts the optical switch. Coarse passive grids have lower power consumption; in addition, outdoor use of passive equipment can avoid the interference problem of active equipment, and its reliability is higher, maintenance is simple, and the cost advantage is obvious. Because of the obvious advantages of passive (PON) point-to-multipoint access technology, PON technology is also the mainstream solution of optical access technology at present.

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