Direct connection: If you're connecting two fiber optic cables directly, use a fiber optic coupler (also known as an adapter). It enables optical signals to pass from one fiber to another with minimal loss, ensuring stable and reliable communication. A fiber optic coupler works by precisely. Fiber optic adapters, also known as couplers, play a crucial role in fiber optic networks by providing a connection point between two fiber optic connectors. This small, inexpensive component is critical for aligning and mating two SC/APC connectors while preserving low. You use optical couplers and splitters to split or join signals in fiber networks. These devices help you control light signals well.