The GYTA53 optical cable is constructed by inserting 250 µm optical fibers into loose tubes made of high-modulus material, with the loose tubes filled with a waterproof compound. At the center of the cable core is a metallic central strength member. For certain fiber counts, a layer of polyethylene (PE) is also extruded over the metallic central strength member. The loose tubes (and fillers) are stranded around the central strength member to form a compact and circular cable core, and the gaps within the cable core are filled with water-blocking fillers. After longitudinal wrapping with plastic-coated aluminum tape (APL), a polyethylene inner sheath is extruded. After longitudinal wrapping with double-sided plastic-coated steel tape (PSP), a polyethylene outer sheath is extruded to form the cable.

• Excellent mechanical performance and temperature characteristics

• The loose tube material itself has good hydrolysis resistance and high strength

• The tubes are filled with a special grease to provide critical protection for the optical fibers

• Good compression resistance and flexibility

• The following measures are adopted to ensure the waterproof performance of the optical cable:

- Single metallic central strength member

- Loose tubes filled with a special waterproof compound

- Complete cable core filling

- Plastic-coated aluminum tape (APL) moisture barrier

- Double-sided plastic-coated steel tape (PSP) to improve the cable’s resistance to moisture penetration

- Good water-blocking materials to prevent longitudinal water seepage in the optical cable