Underground Fiber Cable — Direct Buried Armoured Optical Cable (GYTA53 / GYTS53)
Underground fiber cable (GYTA53 / GYTS53) is a heavy-duty direct buried armoured optical cable with double-jacket steel-tape armor, gel-filled loose tube and G.652D single-mode fiber. Water-blocking, rodent-proof, -40~+70°C.
Subcategory:
Burial Fiber Optic Cable
Our underground fiber cable is a heavy-duty direct buried armoured optical cable engineered for installation straight into the ground — no conduit or duct required. Built on a stranded loose tube, gel-filled structure with G.652D single-mode fiber, it delivers all-round protection against crush, impact, rodent gnawing, moisture and soil corrosion.
Available as GYTA53 (double aluminum-tape + steel-tape armor, double jacket) and GYTS53 (double corrugated steel-tape armor, double jacket), this underground fiber optic cable is the reliable backbone for telecom and inter-office communication networks in the harshest underground environments.
Product Description
The underground fiber cable (also known as a direct buried fiber optic cable or buried armoured optical cable) is a rugged outdoor transmission solution specially engineered for direct burial without extra duct protection. Its two optimized structures — GYTA53 double-armor double-jacket and GYTS53 double steel-tape armor — combine a stranded loose tube design with a full-section water-blocking system.
Adopting high-modulus PBT loose tubes filled with water-resistant gel and G.652D single-mode fiber, the cable provides comprehensive protection against soil pressure, rock extrusion, rodent damage, moisture and saline-alkali corrosion. With ultra-low attenuation (≤0.22 dB/km @1550 nm) and a wide operating range of -40 ℃ ~ +70 ℃, it delivers stable long-haul transmission for high-groundwater areas, wetlands, rocky and saline-alkali regions — serving as a dependable backbone for telecom carriers and municipal infrastructure.
Key Features
- Dual armor options: GYTA53 double-armor double-jacket / GYTS53 double steel-tape armor, customizable per geology.
- All-round mechanical protection: Outstanding crush & impact resistance against soil pressure and rock extrusion.
- Full-section water blocking: Gel-filled loose tubes + 100% cable core filling; ideal for high groundwater and humid soil.
- Anti-rodent & anti-moisture: Steel-tape armor defends against gnawing; PE sheath resists soil corrosion.
- Anti-corrosion & anti-aging: Durable PE/HDPE jacket resists soil chemicals, UV and long-term outdoor aging.
- Ultra-low attenuation: G.652D fiber ensures ≤0.22 dB/km @1550 nm for stable long-distance transmission.
- Wide temperature resistance: Operates stably at -40 ℃ ~ +70 ℃, adapting to extreme climates.
- Cost-effective deployment: Direct burial without conduits greatly reduces construction period and project cost.
Cable Construction
The underground armoured optical cable is built layer by layer to survive harsh buried conditions:
- Optical Fiber (G.652D / G.657A1): 250 μm coated single-mode fibers transmit the optical signal with minimal loss.
- Gel-filled Loose Tube (PBT): High-modulus plastic tubes protect fibers from mechanical stress and moisture.
- Central Strength Member: Phosphated steel wire (or FRP) resists tensile force during pulling and trenchless installation.
- Stranding & Water Blocking: Tubes stranded around the strength member; gaps filled with water-blocking compound to stop longitudinal seepage.
- First Armor — APL / PSP: Aluminum or corrugated steel tape provides moisture barrier and initial crush/rodent resistance.
- PE Inner Sheath: Polyethylene inner jacket adds basic corrosion resistance.
- Second Armor — CST / PSP: A second corrugated steel tape doubles protection against pressure and rodents.
- PE Outer Sheath: Black, UV-stabilized HDPE/MDPE final barrier against moisture, soil chemicals and impact.
Optical Fiber Characteristics (G.652D)
| Item | Unit | Specification |
|---|---|---|
| Mode Field Diameter @1310 nm / 1550 nm | μm | 9.2 ± 0.4 / 10.4 ± 0.5 |
| Cladding Diameter | μm | 124.8 ± 0.7 |
| Cladding Non-Circularity | % | ≤ 0.7 |
| Core-Cladding Concentricity Error | μm | ≤ 0.5 |
| Cable Cutoff Wavelength | nm | ≤ 1260 |
| Attenuation Max. @1310 nm / 1550 nm | dB/km | ≤ 0.36 / ≤ 0.22 |
Cable Technical Parameters
| Model | Fiber Count | Cable Diameter (mm) | Weight (kg/km) | Tensile (Long/Short, N) | Crush (Long/Short, N/100mm) | Bending Radius (Static/Dynamic) |
|---|---|---|---|---|---|---|
| GYTA53 / GYTS53 | 2 – 36 | 13.7 | 190 | 1000 / 3000 | 1000 / 3000 | 10D / 20D |
| GYTA53 / GYTS53 | 38 – 72 | 15.3 | 229 | 1000 / 3000 | 1000 / 3000 | 10D / 20D |
| GYTA53 / GYTS53 | 74 – 144 | 15.9 – 19.2 | 244 – 325 | 1000 / 3000 | 1000 / 3000 | 10D / 20D |
| GYTA53 / GYTS53 | 24 – 288 | 14.2 – 23.0 | 230 – 460 | 1000 / 3000 | 1000 / 3000 | 10D / 20D |
Typical Applications
- Long-haul telecom backbone networks & inter-office communication transmission
- High groundwater areas, wetlands, rocky regions and saline-alkali soil environments
- Urban & rural underground communication coverage without duct infrastructure
- Railway, highway and pipeline accompanying optical communication lines
- Industrial park, mining area and power communication underground wiring
- Harsh-environment projects requiring strong anti-pressure & anti-moisture performance
Standards & Certifications
Our underground fiber cable complies with YD/T 901-2009 and IEC 60794-1, and is manufactured under ISO9001 quality management with CE and RoHS certification. 100% optical test before shipment; designed service life over 30 years.
Packaging & Shipping
Each underground armoured optical cable is packed on a fumigated wooden drum, wrapped with polyethylene sheet and sealed with sturdy wooden battens to protect against moisture during transit.
- Standard drum lengths: 1 km / 2 km / 3 km / 4 km, or customized
- Large orders: by sea (LCL / FCL)
- Small orders: by air or international courier (DHL, UPS, TNT)
- Lead time: 5 – 15 days depending on specification and quantity
Frequently Asked Questions
Why Choose Huaxin
20+ Years Manufacturing
Established optical cable factory with full in-house production, testing and export experience across 50+ countries.
Strict Quality Control
Every underground fiber cable is 100% optically tested before shipment under ISO9001 / CE / RoHS systems.
Factory-Direct Pricing
Buy straight from the source — competitive pricing, fast delivery and free samples for qualified buyers.
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