Single core, Φ nine hundred μ M or Φ six hundred μ M tight pack, spiral steel armor, Kevlar fiber yarn, LSZH/PVC/OFNR outer skin. Armored single core and dual core optical cables are composed of tightly wrapped stainless steel spiral tubes, Kevlar, and outer sheaths. Fiber optic cables have excellent mechanical properties, are easy to route and process, and are excellent transmission media in the field of communication. The products are widely used in national defense communication, radio and television system, building intelligent control, power control system, traffic communication system, Metropolitan area network and local area network.