Tight buffered fiber optic cable is produced as that fiber is sheathed by buffer material. The selection of top-quality fiber, the specific production equipment and the accurate design assure the performance of the product. To be more specific, a single-mode or multi-mode fiber with a tightly-coated secondary coating structure is called a tight buffered fiber or a tight-packed fiber, and is a double-over-plastic (PVC/PVDF) directly coated on a bare fiber (UV fiber). /LSZH/Hytrel), the outer diameter of the tight-fitting fiber is usually 0.6mm and 0.9mm. It is the basic component for manufacturing various indoor optical cables. It can also be used alone and twice coated with various materials. The tight-fitting fiber can be directly used as a pigtail for the connection of various optical active or passive components, the connection of instruments and terminal equipment, and the like.