This application relates to the field of optical cable technology, and more particularly to a central tube type optical cable. The central tube type optical cable includes a reinforcing core, an optical transmission unit, a
heat transfer layer, an enhancement layer, and an outer sheath. The optical transmission unit is disposed on the outer periphery of the reinforcing core; the
heat transfer layer is disposed on the outer periphery of the optical transmission unit and includes an oil reservoir and thermally conductive
silicone oil filled in the oil reservoir; the enhancement layer is disposed on the outer periphery of the
heat transfer layer; and the outer sheath is fitted on the outer periphery of the heat transfer layer. When the thermally conductive
silicone oil flows from the inner oil cavity to the outer oil cavity, the high
thermal conductivity of the thermally conductive
silicone oil carries away the heat of the
optical fiber; when the thermally conductive
silicone oil flows from the outer oil cavity to the inner oil cavity, the low-temperature thermally conductive
silicone oil on the outside flows back into the inner oil cavity, cooling the high-temperature
optical fiber. This forms a heat dissipation and
cooling cycle, effectively transferring the heat generated by the
optical fiber or reinforcing core in a short time to the outside, avoiding permanent damage to the optical
fiber due to excessive temperature.