Optical splitter is also called the fiber coupler, which assigned the optical signals to multiple optic fiber components, which belongs to the optical passive components, in the telecommunications network, cable TV network, the user will applied to the circuit system, LAN, and fiber. Optical splitter is also called the fiber coupler, which assigned the optical signals to multiple optic fiber components, which belongs to the optical passive components, in the telecommunications network, cable TV network, the user will applied to the circuit system, LAN, and fiber. Variable optical attenuators (VOAs) allow for manually adjusting the attenuation of the signal, which is ideal when there is a need to precisely balance signals strength. This is typically achieved by adjusting a screw that changes the internal blocking mechanism to increase or decrease signal. You use optical couplers and splitters to split or join signals in fiber networks. These devices help you control light signals well. Series products include: FC, SC, ST, LC, The MTRJ. Which is widely used in the optical distribution frame (ODF), fiber optic communication equipment, instrumentation, etc. “Passive” means it needs no electricity. One large pipe brings water into a building.