GJFJBV(H) Non-metallic strengthening member, tight-buffered optical fiber, flat, PVC (or low-smoke, halogen-free and flame-retardant) sheathed indoor optical cable. This structural optical cable is a tightly wrapped layer of PVC tightly wrapped two optical fibers. A layer of aramid yarn is placed around the two tightly sleeved optical fibers, and a layer of polyvinyl chloride (or low-smoke, halogen-free, and flame-retardant) sheath is extruded to form a figure-eight flat optical cable.