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Brief introduction of PLC Splitter

Views: 8     Author: Site Editor     Publish Time: 2021-05-20      Origin: Site

What is the PLC splitter? PLC splitter is also called the optical splitter. The optical splitter is one of the important passive components in the optical fiber link. It mainly plays a role of splitting light. It is generally used to split the optical signal between the optical line terminal OLT and the optical network terminal ONU of the passive optical network.


The optical splitter distributes the transmitted optical signal in one optical fiber to multiple optical fibers. There are many types of distribution, 1×2, 1×4, 1×N, or 2×4, M×N. The general architecture of FTTH is: OLT (computer room central office)-ODN (passive optical network distribution system)-ONU (user side), where the optical splitter is used in the ODN to realize that multiple end users can share one PON interface. In the PON structure, when the distribution of buildings is scattered and irregular, such as the distribution of villas, the distance is far, and the user density is low, the centralized light splitting method can make full use of resources to cover the surrounding area.


In a passive optical network, only one optical splitter may be used, or multiple optical splitters may be used together to split optical signals.



Generally, the performance indicators that affect the optical splitter are as follows:


Insertion loss


The insertion loss of a fiber splitter refers to the dB number of each output relative to the input optical loss. Generally speaking, the smaller the insertion loss value,


Split ratio


The splitting ratio is defined as the ratio of the output power of each output port of the optical fiber splitter. Generally, the splitting ratio of the PLC optical splitter is evenly distributed, and the splitting ratio of the fusion taper optical splitter can be unequal. The specific ratio setting of the splitting ratio is related to the wavelength of the transmitted light. For example, when an optical branch transmits 1.31 micron light, the splitting ratio of the two output ends is 50:50; when transmitting 1.5μm light, it becomes 70: 30 (This situation occurs because the optical fiber splitter has a certain bandwidth, that is, the bandwidth of the transmitted optical signal when the splitting ratio is basically unchanged).




Isolation refers to the ability of an optical path of a fiber splitter to isolate optical signals in other optical paths.


Return loss


Return loss is also called reflection loss, which refers to the power loss of the optical signal returned or reflected by the discontinuity in the optical fiber or transmission line. The larger the return loss, the better to reduce the impact of reflected light on the light source and the system.


In addition, uniformity, directivity, PDL polarization loss, etc. are also parameters that affect the performance of the optical splitter. Optical fiber splitter is one of the most important passive equipment in optical fiber link, especially suitable for connecting MDF and terminal equipment to distribute optical signal in passive optical network (EPON, GPON, BPON, FTTX, FTTH, etc.).

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