Insert the optical fiber into a spiral space loose tube made of high modulus plastic, fill the tube with waterproof compound, apply a layer of waterproof material and armor material outside the tube, place two parallel steel wires on both sides, and extrude polyethylene sheath to form a cable.

The main characteristics of central tube optical cable are:

1. The unique spiral groove loose tube design is conducive to precise control of the remaining length of the optical fiber, ensuring that the optical cable has good mechanical properties and temperature characteristics.

2. The loose tube material itself has good hydrolysis resistance and high strength. The tube is filled with special grease to provide critical protection for the optical fiber.

3. Two parallel steel wires ensure the tensile strength of the optical cable.

4. Small diameter, light weight, easy to lay.