Self-supporting optical cable type

Self-supporting optical cables include ADSS, OPGW, and GYTS, designed to carry fiber optics without additional support structures.1. ADSS (All-Dielectric Self-Supporting) Cables

ADSS cables are completely dielectric, meaning they contain no metallic components, which allows safe installation near high-voltage power lines without risk of electrical interference or short circuits . They are designed to support their own weight over spans up to 700 meters and withstand environmental stresses such as wind, ice, and UV radiation . ADSS cables typically use single-mode fibers in loose tube or ribbon configurations, with fiber counts ranging from 2 to 864, and can transmit data over distances up to 100 km without repeaters . Core structures include central tube and layered twist designs, optimized for different span lengths and fiber counts .

2. OPGW (Optical Ground Wire)

OPGW cables combine the functions of a ground wire and fiber optic backbone. They are installed on high-voltage transmission towers, replacing conventional ground wires, and provide lightning protection while carrying optical fibers for communication . OPGW contains metallic elements such as stainless steel or aluminum for mechanical strength and grounding, making it suitable for long spans and high-voltage environments . Fiber protection is achieved through loose tube construction with jelly filling to prevent strain and moisture damage .

3. GYTS (Outdoor Stranded Loose Tube - Steel)

GYTS cables are armored outdoor cables with a corrugated steel tape (CST) layer for mechanical protection . They are widely used in telecommunications networks where durability and environmental resistance are critical. The loose tube design ensures minimal strain on the fibers, and the steel armor protects against physical damage, rodents, and harsh weather conditions .

Key Considerations

When selecting a self-supporting optical cable, factors include:

• Span length and tensile strength: ADSS is ideal for medium spans, OPGW for long spans with grounding needs.
• Environmental resistance: Wind, ice, UV exposure, and high-voltage proximity.
• Fiber count and configuration: Loose tube vs. ribbon, single-mode vs. multimode.
• Installation cost and complexity: ADSS reduces the need for additional support structures, while OPGW provides dual functionality as a ground wire . These self-supporting cables are essential for power grid communications, broadband infrastructure, and aerial fiber networks, offering reliable performance in challenging outdoor environments .