Views:28 Author:Fiberall Technology (Shenzhen) Co., Ltd Publish Time: 2016-06-16 Origin:www.fiber-all.com
With the popularity of optical fiber communication networks, the FTTH (fiber to the home) project has been gradually introduced to the outskirts of the city. To deploy the FTTH project to the suburbs, there are two optical splitting infrastructures: centralized optical splitting and decentralization optical splitting, which is more suitable for suburban FTTH deployment?
In the centralized optical network structure, the feeder fiber cable extends from the central office to the optical fiber distribution box, and is connected to the 1x32 fiber optic plc splitter in the fiber distribution box, and then the splitted optical signal is transmitted to the end users through 32 feeder optical cables. The optical fiber distribution box is not only the optical fiber distribution point, but also the fusion point of optical fiber. It has the function of protecting and managing the optical fiber. In this structure, the amount of the feeder fiber cable is less, but the fiber cable is used as a unit with the number of terminal users, so the amount is large.
A number of optical splitter with less channels is usually used in distributed optical network structure (1:4 or 1:8), and these fiber optic PLC splitter is cascade distribution. This structure reduces the use of optical fiber distribution box, and the deployment of optical splitters is also more dispersed and flexible.
Fiber optic PLC splitters in centralized optical networks can cover a wide range of end users flexibly, instead of an optical splitter corresponds to only a building or a unit, each PON port can be fully utilized; dispersion type optical network takes a building or a region as a spot, therefore, a building or a region requires a PLC splitter, a fiber PLC splitter corresponds to a PON port, so more PON is required.
If the distance between the PON port and the center is within the range of 5000 feet, to use concentrated optical splitting will be with lower cost; and if the distance is over 5000 feet, dispersion type optical splitting is more cost-effective, and the greater the distance, the cost advantage is more obvious. Because the users in the suburbs are usually dispersed, we should make the fiber splitter closer to the users as possible, though it will increase the length of the feeder fiber cable (the distance from the PON port to the central office), but also save a lot of wiring optical cables. In addition, if the FTTH network is deployed in the suburb, the fiber optic PLC splitter is connected to the network by optical fiber fusion, the economic benefit can be increased.
There are advantages and disadvantages in both centralized and decentralized optical distribution, which should be deployed according to the actual needs and applications. In general, the centralized optical distribution is suitable for the urban areas with dense users, and the decentralized optical distribution is suitable for the suburbs with scattered users.