A fiber coupler is a passive optical device that manages the flow of light signals within an optical network. It functions by dividing a single incoming light path into multiple outgoing paths, or by combining light from several input paths into a single output fiber. Additionally, they are. Some couplers use side- polished fibers, providing access to the fiber core. Its primary function is to enable a point-to-multipoint network architecture, which is the backbone of Passive Optical Networks (PON) like. Fiber optic couplers, also known as fiber optic splitters, are devices used to split or combine optical signals in fiber optic networks. They play a crucial role in various applications, such as telecommunications, data centers, and fiber-to-the-home (FTTH) installations. This capability is fundamental.