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Author: James Publish Time: 21-07-2025 Origin: Site
These cables have been engineered for direct underground installation and are guaranteed to withstand any conditions without the need for extra conduit. These cables assure supreme mechanical strength, high resistance to moisture, and great ecological durability. They are the best solution for areas where duct insertion is impossible, including rural network areas, long-distance trunk lines, and open-field conditions where no covered area exists.
Direct-buried fiber optic cables typically consist of multiple layers of protection to withstand underground conditions, including:
Loose Tube Design: Optical fibers here are being laid down inside of loose tubes filled with gel that is designed for water resistance.
Central Strength Member (steel or FRP): Provides tensile strength and structural integrity for the fiber optic cable.
Double Armoring: In all models, steel tape armor and a polyvinyl chloride (PVC) sheath are common elements, and such armor is often in double layers for enhanced rodent and crushing resistance.
Moisture Barrier: A moisture-migration barrier tape or jelly blocks moisture from pulling along.
Outer Sheath: Heavy-weight, highly durable UV-stabilized PE or optional nylon outer sheath. The Flame-Retardant Shelter (FRS) can be manufactured in various colors, allowing customers to select their own designs.
Direct buried fiber optic cables are often deployed in:
Long-distance trunk line segments in countryside areas and developmentally void parking lots.
Suburban backbone equipping schemes with no service avenue for the underground.
In field installations, the feeder cables for FTTH are usually in greenfield situations.
Mechanical protection is an essential requirement for underground installations, making them more suitable.
Download Outdoor Optical Fiber Cable PDF
Model | Structure | Strength Member | Armoring | Fiber Count | Sheath Type |
Loose tube + steel tape + PE sheath | Central Steel | Steel tape armor | 2–288 | Dual PE | |
Loose tube + AL tape + steel tape + PE | Central Steel | AL + steel tape | 2–288 | Dual PE | |
GYFTA53 | Loose tube + FRP + steel tape + PE | FRP (non-metal) | Steel tape armor | 2–144 | PE |
✅ All models are designed for direct burial and provide high crush resistance and protection against rodents, soil pressure, and water ingress.
Customize Your Outdoor Optical Fiber Cable
■ How to Choose the Right Direct Buried Optical Cable
Selecting the correct direct-buried optical fiber cable is crucial for ensuring long-term reliability in underground environments. Below is a structured selection guide based on installation conditions, mechanical protection, fiber requirements, and environmental considerations.
Underground Environment | Recommended Cable Type | Key Features |
Standard soil conditions | Dual PE sheath + steel tape armor for crush protection | |
Areas with high moisture or flooding | AL-tape + steel tape dual armor for enhanced water resistance | |
EMI-sensitive or power-adjacent trenches | All-dielectric (non-metallic) FRP strength member |
2. Choose Based on Structural Protection Needs
Protection Requirement | Suggested Cable Type | Notes |
Strong crush & rodent resistance | Steel tape armor handles soil pressure and rodents | |
Non-metallic design (no grounding) | Safer for power trench and lightning-prone areas | |
Additional moisture blocking | AL-tape layer acts as a moisture barrier |
Network Application | Recommended Fiber Type | Explanation |
Long-haul trunk transmission | G.652.D | Low attenuation, standard single mode fiber |
Shorter access / FTTH backbone | G.657.A1 | Bend-insensitive, compatible with G.652.D |
Dense duct routes or sharp turns | G.657.A2 | Ultra bend-resistant for compact routing |
■ Fiber Specification Snapshot
Direct buried cables can be manufactured with G.652.D, G.657.A1, or G.657.A2 fibers:
Fiber Type | Attenuation @1310nm | Macro Bending Resistance | Best Use Case |
G.652.D | ≤ 0.35 dB/km | Standard | Long-distance backbone |
G.657.A1 | ≤ 0.34 dB/km | Enhanced | Complex routing |
G.657.A2 | ≤ 0.34 dB/km | Ultra Bend-Insensitive | Tight underground ducts |
Fiber color coding follows TIA/EIA-598 or YD/T standards, using the standard 12-color sequence (Blue, Orange, Green, Brown, Grey, White, Red, Black, Yellow, Violet, Pink, Aqua). Tubes are coded similarly. Additional fiber counts repeat the color sequence with color ring marks.
Note:
1. If there are less than 12 fibers in a loose tube, the color sequence is followed continuously, starting from No.1,
2. In the standard color sequence, No.6 white color can be replaced by natural color, called the W color sequence.
3. Color arrangement can be customized.
Standard Drum Length: 2000–4000m per wooden drum.
Drum Markings: Manufacturer, fiber type, production year/month, gross/net weight, and project number (optional).
Packaging: Each reel is protected with plastic buffer film and secured with wooden battens.
Zion Communication offers:
✔ Large selection of outdoor fiber cable categories.
✔ A/B (OEM/ODM) branding into the problem you need.
✔ Compatibility with ITU-T, IEC, and TIA/EIA standards.
✔ Cost-effective and rapid delivery.
Contact us now to get datasheets, samples, and a project-based quote.
James is a technical manager and associate at Zion Communication.
Specializes in Optical Fiber communications, FTTH Solutions,
Fiber optic cables, ADSS cable, and ODN networks.
james@zion-communication.com
+86 13777460328
