Optical fiber cable is manufactured to meet the optical, mechanical or environmental performance specifications. It is a communication cable component that uses one or more optical fibers placed in the sheath as the transmission medium and can be used separately or in groups. The optical cable is mainly composed of optical fiber (glass fiber as thin as hair), plastic protective sleeve and plastic sheath. There is no metal such as gold, silver, copper and aluminum in the optical cable, and generally there is no recycling value. Optical cable is a kind of communication line in which a certain number of optical fibers form a cable core in a certain way, and are wrapped with a sheath, and some are also wrapped with an outer sheath to realize optical signal transmission. That is, the cable formed by optical fiber (optical transmission carrier) through a certain process. The basic structure of optical cable is generally composed of cable core, reinforcing steel wire, filler and sheath. In addition, there are waterproof layer, buffer layer, insulated metal wire and other components as required

The optical cable is composed of cable core, reinforcing steel wire, filler and sheath. In addition, there are waterproof layer, buffer layer, insulated metal wire and other components as required

The optical cable is composed of reinforcing core and cable core, sheath and outer sheath. There are two types of cable core structure: single-core type and multi-core type. There are two types of single-core type: full-core type and tube bundle type; There are two types of multi-core type: ribbon type and unit type. There are two kinds of outer protective layer: metal armor and non-armor

The most important thing for long distance optical cable laying is to choose a suitable path. It is not necessarily that the shortest path is the best, but also pay attention to the land use right, the possibility of erection or burial

The main purpose of optical fiber detection is to ensure the quality of system connection, reduce fault factors and find out the fault point of optical fiber in case of fault. There are many detection methods, mainly including simple manual measurement and precision instrument measurement

1. Manual and simple measurement

This method is generally used to quickly detect the on-off of optical fiber and to distinguish the optical fiber made during construction. It is realized by using a simple light source to inject visible light from one end of the optical fiber, and observing which one emits light from the other end. Although this method is simple, it can not quantitatively measure the attenuation and break point of optical fiber

2. Precision instrument measurement

The optical power meter or optical time domain reflectometer (OTDR) can be used to measure the optical fiber quantitatively, and the attenuation of the optical fiber and the attenuation of the connector can be measured, and even the break point position of the optical fiber can be measured. This measurement can be used to quantitatively analyze the cause of the failure of the optical network and evaluate the optical network products