In-Depth Understanding of Fiber Optic Splitter

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WHITE PAPER • PLC Splitter PLC (planar lightwave circuit) splitter is the recent addition in fiber optic technology to exhibit uniform signal splitting among the most advanced optical networks. PLC splitter is a fully passive optical branching device that is based on planar light wave circuit technology and precision aligning process, which can evenly split or distribute a single optical signal/input into many outputs with high accuracy and minimal loss in an efficient manner. PLC splitter is a high-quality device, which offers a better solution for larger applications. Figure 2 is a picture of 1×64 PLC splitter. Figure2. 1×64 PLC Splitter Splitting Ratios: 1×N VS. 2×N There are a number of splitting ratios available for splitter deployment, but the most common splitters deployed in a PON system is a uniform power splitter with a 1×N or 2×N splitting ratio, where the letter “N” means the number of output ports. The 1×N splitters are usually deployed in networks with a star configuration, while 2×N splitters are more suitable in networks with a ring configuration as shown in figure 3 to provide physical network redundancy. The optical input power is distributed uniformly across all output ports. Although non-uniform power distribution is also available for fiber optic splitters, such splitters are usually custom-made and command a premium. Besides, based on different data transmission distances, there are also some suggestions for splitting ratios selection. If your distance between OLT (optical line terminal) and ONU (optical network unit) is long, like 20 km, you can use splitting ratio 1:32 to receive qualified fiber optic signals, and when the distance between OLT and ONU is short, like 5 km, you can consider about 1:64 splitting ratio. Figure 3. Star Configuration VS. Ring Configuration FS.COM White Paper | In-Depth Understanding of Fiber Optic Splitter
Splitting Levels: Cascaded Splitting VS. Centralized Splitting WHITE PAPER Depending on the customer distribution, there are two common deployment strategies of Fiber optic splitter—cascaded splitting and centralized splitting. • Cascaded Splitting In most cases, a cascaded splitter approach as shown in figure 4 has no splitters in the central office. The OLT port is connected/spliced directly to an outside plant fiber. A first level of splitting (1:4 or 1:8) is installed in a closure, not far from the central office. A second level of splitters (1:16 or 1:8) resides in terminal boxes, very close to the customer premises (each splitter covering 8 to 16 homes). The inputs of these splitters are the fibers coming from the outputs of the first level splitters described above. Figure 4. Cascaded Splitter Approach • Centralized Splitting A centralized splitter approach generally uses a combined splitting ratio of 1:64 (with a 1:2 splitter in the central office, and a 1:32 in an outside plant enclosure such as cabinet). These single-stage splitters can be placed at several locations in the network or housed at a central location. The 1:64 splitter could even be placed within the central office to provide a point-to-multipoint (P2P) outside plant network that still shares bandwidth across multiple customers as shown in figure 5, for instance a group of subscribers a short distance from the central office. But most often, the splitters are placed in the outside plant to reduce the amount of overall fiber required. Figure 5. Centralized Splitting Approach FS.COM White Paper | In-Depth Understanding of Fiber Optic Splitter
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In-Depth Understanding of Fiber Optic Splitter

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