Passive Optical Network (PON) separators play a key role in fiber-to-the-home (FTTH) solutions by allowing a single PON network interface to be shared among many users. The shunt does not contain electronic components and does not use power. They are passive components that are placed in passive optical networks and are available at various frequency divisions. Fiber PLC splitter is an integrated waveguide optical power distribution device based on quartz substrate. It has the characteristics of small volume, wide working wavelength range, high reliability and good spectral uniformity. It is especially suitable for passive optical network (EPON, BPON, GPON, etc.) ) To connect the central office and terminal equipment and to achieve optical signal shunt. The fiber PLC splitter is installed in each fiber network between the PON optical line terminal (OLT) and the optical network terminal (ONT) served by the OLT. The PON network may be designed to have a single optical splitter, or it may have two or more splitters cascaded together. Since each optical connection increases attenuation, a single splitter is superior to multiple cascade separators. When the two splitters are connected together, a net additional coupling (and attenuation source) is introduced. There are two basic techniques for establishing passive optical network separators: melt double cone (FBT) and planar optical wave circuit (PLC). Fused double cone is the older technology, and usually the newer PLC separators introduce more losses, although both the PLC splitter and the FBT splitter are used for the PON network. The PLC splitter is a cost-effective passive optical component that enables a single network interface to be shared by two or more users. Choosing the right package for the PLC dispenser can be a lot of help during network deployment and maintenance. With the continuous development of optical fiber technology, fiber PLC splitter is the current hot research at home and abroad, the application of broad prospects for the distribution or combination of optical signals. It is based on planar optical wave technology, providing a low-cost light distribution solution, small size, high reliability.