The requirement for the manufacturing process of optical cables is simplicity and reliability. According to the characteristics of optical cables, the following points must be achieved:

1. Strictly control the tension of unwinding and rewinding on the optical fiber to ensure that the fiber is continuously produced during the manufacturing process, with minimal stress and residual stress on the fiber;

2. Strictly control the micro bending attenuation caused by mechanical external forces during the manufacturing process, so that it does not affect the transmission performance of optical fibers;

3. Choose a reasonable plastic extrusion process to avoid micro bending attenuation caused by plastic thermal shrinkage due to improper processing, ensuring that the optical cable has long-term stable transmission performance.

4. The outer sheath of optical cables is used to improve their resistance to lateral pressure, tensile strength, and moisture sealing. Currently, there are eight main types of optical cable outer sheath structures in China:

(1) Simplified polyethylene protective layer (PE sheath) structure;

(2) Aluminum/polyethylene composite longitudinal bonding protective layer (LAP) structure;

(3) Wrinkled steel strip longitudinal overlap with PE protective layer structure;

(4) Aluminum/polyethylene composite longitudinal package bonding protective layer with corrugated steel strip overlap and PE protective layer overlap;

(5) Aluminum/polyethylene composite longitudinal wrapping adhesive protective layer, steel strip longitudinal wrapping, and PE protective layer overlap;

(6) Aluminum/polyethylene composite longitudinal wrapping adhesive protective layer, corrugated steel strip longitudinal wrapping, and PE protective layer overlapping;

(7) Aluminum/polyethylene composite longitudinal package bonding protective layer, steel wire armor, and PE protective layer overlap;

(8) Aluminum tube/armor/PE protective layer comprehensive sheath structure.