This guide explains fiber optic cable construction, the difference between tight buffer and loose tube structures, and compares eight common cable types used in data centers, enterprise networks, and FTTH deployments. A passive optical network uses optical splitters to distribute signals from one central optical line terminal (OLT) to multiple optical network terminals (ONTs) without requiring powered network equipment in between. This design minimizes energy costs and simplifies maintenance, making it ideal for. Optical Fiber Communication Engi-neering Design Optical Fiber Line Construc-tion Technology. Unlike traditional copper or.