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GYFTA53 FRP Strength Member Double Jackets Double Armor Direct Buried UG Fiber Optic Cable
GYFTA53 is a direct buried fiber optic cable designed for harsh underground environments, featuring an FRP (Fiber Reinforced Plastic) strength member, double armor layers, and double jackets (inner and outer jackets). It is widely used in long-distance communication networks, municipal infrastructure, and industrial wiring due to its excellent mechanical protection, corrosion resistance, and environmental adaptability.
| Model | GYFTA53 |
| Fiber Counts | 2F- 288F |
| Central Strength Member | FRP (Glass Fiber Reinforced Plastic) |
| Buffer Tube | Loose Tube |
| Moisture Proof | Cable Filling Compound |
| First Armor | Aluminum Tape |
| Inner Sheath | PE |
| Second Armor | Corrugated Steel Tape (CST) |
| Outer Sheath | PE |
| Application | Direct Buried/ Duct Installation |
Description:
GYFTA53 belongs to the "GY" series of China national standard fiber optic cables, where each letter in the model has a specific meaning to define its core structure and function:
| Model code | Meaning |
| GY | Outdoor Fiber Optic Cable |
| F | Non-metallic FRP (Fiber Reinforced Plastic) Central Strength Member |
| T | Filler (water-blocking material filled between loose tubes and armor) |
| A | First Armor Layer: Aluminum Tape Armor + PE sheath |
| 53 | Second Armor Layer: Corrugated Steel Tape + PE sheath |
GYFTA53 Fiber Optic Cable is a stranded loose-tube, FRP-reinforced, double-armored (aluminum tape + steel tape), double-jacketed (PE) cable optimized for direct burial/ Duct intallation.
Stranding: Multiple loose tubes (e.g., 2–12 tubes) are stranded around the central FRP strength member in a helical pattern (ensures flexibility and uniform stress distribution).
The structure of GYFTA53 follows a "layered protection" design, from the inner optical fiber to the outer jacket, ensuring multi-dimensional durability. The structure (from inside to outside) is as follows:
| Layer No. | Component | Function |
| 1. Optical Fiber Core | Single-mode (e.g., G.652D, G.657A1) or multi-mode (e.g., OM3, OM4) optical fibers, typically 2–144 fibers (customizable for more cores). | Transmits optical signals; single-mode fibers are used for long-distance (≥10km) communication, while multi-mode fibers suit short-distance (≤2km) scenarios (e.g., campus networks). |
| 2. Loose Buffer Tube | PBT, tube diameter1.5-3.0mm | Protects fiber from external stress, Filled with thixotropic water-blocking gel (prevents water penetration, critical for underground use). |
| 3. Waterproof layer | Cable filling compound or water-blocking tape | water-blocking materials are placed in the gaps between loose tubes to block longitudinal water infiltration. |
| 4. Central FRP Strength Member | Fiber-reinforced plastic (glass fiber + resin matrix) | Bears the main tensile force during cable laying (e.g., pulling, burial) to protect the fragile optical fibers. |
| 5. First Armor | Aluminum Tape Longitudinal Wrapping | Blocks moisture, gases, and soil contaminants (prevents jacket degradation). Resists rodent bites (aluminum's hardness deters mice, moles, etc.). Enhances structural stability (prevents cable core deformation). |
| 6. Inner Sheath | Medium-density polyethylene (MDPE) | Bonds the aluminum armor to the outer steel tape armor (ensures layer adhesion). Provides primary protection against abrasion (e.g., from rocks in soil during burial). Acts as a buffer between the rigid aluminum armor and flexible outer jacket. |
| 7. Second Armor | Corrugated Steel Tape | Anti-compression: Withstands heavy loads (e.g., vehicle traffic, soil pressure in deep burial). Anti-tension: Enhances tensile strength for long-distance pulling (e.g., horizontal directional drilling). Anti-rodent: Steel's rigidity resists severe rodent damage (critical for rural/wooded areas). |
| 8. Outer Sheath | High-density polyethylene (HDPE) or special anti-UV PE (for shallow burial where sunlight may penetrate soil) | Ultimate barrier against abrasion, chemicals and environmental aging. Resistance to low/high temperatures (-40°C to +70°C, suitable for most climates). Smooth surface for easy burial (reduces friction with soil/rocks). |
GYFTA53
GYFTA53 Structure Diagram
Features of GYFTA53 Fiber Optic Cable:
Tensile Strength: Can withstand tensile forces of 15–30kN (depending on cable diameter), suitable for long-distance pulling during horizontal directional drilling (HDD) or trenchless construction.
Compression Resistance: Steel tape armor resists static pressure of ≥10kN/100mm (prevents fiber breakage under vehicle loads or compacted soil).
Impact Resistance: Double jackets and armor layers absorb impact from rocks or construction equipment (common in municipal road projects).
Corrosion Resistance: FRP strength member + aluminum tape+ steel tape + PE jackets resist rust, acid/alkaline soil, and groundwater (service life ≥25 years in most underground environments).
Water Blocking: Multi-layer water-blocking design (gel, yarns, aluminum tape) prevents water penetration—critical for avoiding signal loss caused by water-induced fiber attenuation.
Temperature Stability: Loose tube structure and low-shrinkage materials ensure stable performance from -40°C (cold regions) to +70°C (hot regions).
Non-Conductive: FRP and plastic materials eliminate electrical conductivity, avoiding EMI from power cables and reducing lightning damage risks (safe for use near high-voltage lines).
Rodent & Pest Resistance: Aluminum tape + steel wire armor deters most underground pests (mice, termites, moles)—a common issue for unarmored cables.
Direct Burial: No need for expensive protective ducts (reduces construction costs and time).
Flexibility: Helical stranding of loose tubes and steel wires makes the cable easy to bend (minimum bending radius: 10× cable diameter for static installation, 20× for dynamic installation).
Low Maintenance: Robust structure minimizes repair needs—ideal for remote areas (e.g., rural communication networks).
Applications:
Used for backbone and metro fiber networks (e.g., connecting cities, data centers) where direct burial is more cost-effective than aerial cables or ducts.
Suitable for cross-country projects (e.g., rural-urban connectivity) due to its resistance to harsh soil and weather.
Road & Highway Communication: Buried under road shoulders to support traffic monitoring systems, smart city sensors, and emergency communication.
Water & Gas Pipelines: Laid alongside underground pipelines to transmit monitoring data (e.g., pressure, flow rate) for pipeline maintenance.
Subway & Tunnel Projects: Buried in tunnel walls/floors to support subway communication and control systems (resists vibration and humidity).
Mines: Buried in underground mines to connect mining equipment and monitoring systems (resists dust, moisture, and mechanical impact).
Industrial Parks: Used for internal communication between factories (resists chemical corrosion from industrial wastewater/soil).
Ideal for rural broadband networks (e.g., "Broadband to the Countryside" projects) where aerial cables are vulnerable to wind/ice damage, and ducts are too expensive.
Used in forestry and agricultural areas to support precision agriculture (e.g., sensor data transmission for irrigation systems).
Deployed as a backup communication line for critical infrastructure (e.g., power grids, hospitals) due to its high reliability and low failure rate.
1. Structure Parameter
| Model | GYFTA53 | ||||||||
| Fiber Type | G652D G655 G657 50/125 62.5/125 | ||||||||
| Fiber Counts | 2-30 | 32-36 | 38-60 | 62-72 | 74-96 | 98-120 | 122-144 | 146-216 | 218-288 |
| Max. fibers per tube | 6 | 6 | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
| Units (Tubes or Fillers) | 6 | 6 | 6 | 6 | 8 | 10 | 12 | 18 | 24 |
| Cable Diameter（mm） | 13.9 | 13.9 | 14.7 | 14.7 | 16.0 | 17.4 | 18.9 | 19.3 | 21.3 |
| Cable Weight（Kg/km） | 178 | 178 | 199 | 199 | 234 | 274 | 320 | 327 | 398 |
| Tensile（N） | Long/Short Term：1000/3000 | ||||||||
| Crush（N/100mm） | Long/Short Term：1000/3000 | ||||||||
| Min. Bending Radius (mm) | Static/Dynamic：12.5D/25D | ||||||||
| Temperature (℃) | Storage /Operation：-40℃~70℃ | ||||||||
2. Fiber Color Identification
No. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
Color | Blue | Orange | Green | Brown | Slate | White | Red | Black | Yellow | Violet | Pink | Aqua |
3. Fiber Parameter G652.D (after cable)
Item | Characteristics | Unit | Value | |
Geometrical | Cladding Diameter | μm | 125.0±1.0 | |
Cladding Non-circularity | % | ≤1.0 | ||
Core-Cladding Concentricity Error | μm | ≤0.6 | ||
Core Non-circularity | % | ≤12 | ||
Coating Diameter | μm | 245±10.0 | ||
Coating-Cladding Concentricity Error | μm | ≤12 | ||
Curl Radius | m | ≥4 | ||
Attenuation | Zero Dispersion Slope S0 | ps/nm²km | ≤0.092 | |
1625nm Attenuation | dB/km | ≤0.30 | ||
1383+/-3nm Attenuation | dB/km | ≤0.36 | ||
1310nm Attenuation | dB/km | ≤0.36 | ||
1550nm Attenuation | dB/km | ≤0.22 | ||
Point Discontinuity (1310nm & 1550nm) | dB | ≤0.05 | ||
Attenuation at 1285nm ~ 1330nm compared with 1310nm | dB | ≤0.03 | ||
Attenuation at 1485nm ~1580nm compared with 1550nm | dB | ≤0.03 | ||
Zero Dispersion Wavelength λ0 | nm | 1300≤λ0≤1324 | ||
Dispersion | 1285~1339nm Dispersion | ps/nm/km | ≤3.5 | |
1271~1360nm Dispersion | ps/nm/km | ≤5.3 | ||
1550nm Dispersion | ps/nm/km | 13.3~18.6 | ||
Nominal MFD Value（1310nm） | μm | 8.6-9.5 | ||
MFD Tolerance | μm | ±0.4 | ||
Bending | Cable Cut-off Wavelength λcc | nm | ≤1260 | |
1550nm Macro-bend Induced Attenuation（ 100turns with diameter of 60mm ） | dB | ≤0.5 | ||
PMD | Q | 0.01% | ||
Maximum Individual Fiber | ps/√km | 0.2 | ||
M | 20 cables | |||
Delivery Length:
normally 2km, 3km, 4km, 5km (as your request)
Drum options:
Fumigated Wooden Drum
Steel-reinforced Wooden Drum
Plywood Drum.
Cable and Drum Marking according to customer's requirements
Shipping Pictures:
