Single-mode cable for long-haul, trunk, and loop networks

In the seven years since their commercial introduction, lightguide systems have swept the telecommunications industry. The original multimode fibers have now given way to single-mode fibers designed for operation at 1310- and 1550-nm wavelengths. These developments have stimulated an evolution in lightguide cable designs to meet the specialized needs of the various applications such as long-haul, interoffice trunk and loop networks. Cables are used in underground duct systems, aerial, and direct-buried installations. At present, high-quality cables using single-mode fibers are being manufactured in volume. A review of the design and performance of AT&T single-mode lightguide cables is presented.