With the rapid development of FTTH, the access network drop cable has been introduced large number of applications, the drop cable has become to the main products at the last kilometer of FTTH. Drop cable in the practical application, the inevitable need to install fiber optic connectors at the both ends of the optical fiber, as part of the optical line, to facilitate the connection cable and optical communications devices.
A few years ago, as the cable connecting devices and optical communication devices is field assemblies connector, field assembled fiber optic connector is generally divided into two types: mechanical type and thermal fusion type, both before years have been used a lot.
Mechanical field assembled fiber optic connector due to environmental conditions of the installation site is poor, and high precision fiber optic connector installation requirements, coupled with the uneven quality of the product, resulting in the practical application of the effect is not satisfactory. The main reason is due to the insertion loss is unstable, sometimes lead nowhere light. The thermal fusion type assembled fiber optic connector, construction convenient, is not easy to splice and not properly placed.
Therefore, in recent years, operators prefer a preset pre-terminated optical cable assemblies. I.e., the optical fiber connector installed in the factory production process, the fiber optic connector preinstalled in one or both ends of the cable leads. When construction of fiber optic cable has been installed a fiber optic connector, the connector simply insert the appropriate equipment can be connected. Although this method has a connector to the construction inconvenience, but the stability of the connector insertion loss and return loss and significantly better than on-site assemblies type, and the cable ends no fusion splices, splice loss will not increase, So in this way it is currently the most widely used.
Currently butterfly drop cable pre-terminated applications are mostly circular pre-terminated optical cable assemblies are also applied. pre-terminated optical cable assemblies is mainly used in situations connected terminal or other optical signal transmission network optical network, as a drop cable or indoor cable used mainly for laying indoor environment or outdoor aerial . Drop cable preformed side component length is usually several meters to several hundred meters, and has a jumper, pigtail same connection quality.