Outdoor fiber optical cable has good mechanical properties such as crush resistance, tensile strength and corrosion resistance, as well as environmental characteristics such as heat resistance, frost resistance and durability. It mainly used as the backbone for long-distance trunk lines, as well as that of wire transmission in local area networks, private networks, etc., and has begun to develop towards the access networks, from FTTC, FTTB to FTTH. For various applications and environmental conditions, outdoor cables can be laid overhead, direct burial, in pipeline, underwater, indoor, etc.