In modern network infrastructure, there is widespread use of double sheathed cable in outdoor installations and FTTH installations due to its higher durability than other fiber optics. It has a greater strength, environmental resilience, and lifespan; thus being considered a better choice when building fiber optic network infrastructure.
1. Why is Double Sheathed Cable More Durable?
(1) Dual-Sheathing Protective Features
The basic characteristic of double sheathed cable lies in the presence of an additional protective layer, which consists of two layers: an outer layer that withstands external impacts and an inner one protecting the fiber itself from the additional strain.
(2) Enhanced Mechanical Strength
With additional reinforcement elements, double sheathed cable offers higher tensile and compression resistance than standard cables. This makes it especially suitable for duct, direct burial, and complex installation environments.
2. Material and Environmental Advantages of Double Sheathed Cable
1. High-Quality Materials
As a rule, high-density polyethylene (HDPE) or low smoke zero halogen (LSZH) is used as an outer sheath material in double sheathed cable, offering excellent wear resistance properties. Meanwhile, the inner sheath increases the fiber’s flexibility.
Thus, for example, OMC 1-core 4.5mm FTTH double sheathed cable with 1.8 mm sub-cable with the added aramid yarn as reinforcement element. The LSZH outer sheath ensures better safety, making it suitable for indoor and outdoor use.
2. Better Environment Resistance
Thanks to its multi-layer construction, the double sheathed cable maintains stable performance under varying temperature and moisture conditions. The external jacket provides effective protection against environmental stress, while the inner subcaste helps buffer internal factors, reducing the impact of humidity and thermal expansion.
3. Long-term Efficiency of Using Double Sheathed Cable
1. Longer Operation
Thanks to high-quality construction, double sheathed cables have increased service life and can be used longer than common fiber cables without frequent replacement.
2. Reduced Maintenance Costs
Higher durability leads to fewer failures, which helps lower maintenance costs and ensures stable network performance over time.
3. Key Parameter Comparison
| Parameter | double sheathed cable | Standard fiber cable |
| Tensile Strength | 600–1200 N | 200–500 N |
| Compression Resistance | 1500–2000 N/100mm | 800–1200 N/100mm |
| Minimum Bend Radius | 10D–15D | 15D–20D |
| Operating Temperature | -30℃ ~ +70℃ | -20℃ ~ +60℃ |
| Service Life | 20–25 years | 10–15 years |
| Customization | High | Limited |
4. Common Uses of Double Sheathed Cable
Double sheathed cable is extensively employed in situations where ruggedness and consistency are essential:
- FTTH outside plant: ideal for aerial, conduit, and direct burial applications
- Urban housing complexes: guarantee dependable end-user connections in metropolitan networks
- Rural networks: support long-distance transmission with low maintenance requirements
- Industrial areas: withstands mechanical abuse, vibrations, and extreme environmental conditions
- Outdoor applications: functions effectively under UV radiation, moisture, and varying temperatures
5. Double Sheathed Cable Customization Advantages in FTTH Application
OMC proposes solutions based on double sheathed cable, which allows for creating reliable networks for data transmission and minimizing signal losses of signals.
One of the key advantages of double sheathed cable proposed by OMC is the possibility of obtaining a product tailored according to the individual client’s preferences:
- A choice of either single-mode or multi-mode fibers
- Number of Cores: From 1 to 12 cores can be customized
- Type of Sheath: Two materials are offered – LSZH and PVC
- Construction and Diameter: Can be chosen depending on installation conditions
- Length of Cables: Different options can be provided upon request
Conclusion
Overall, the durability of double sheathed cable comes from its dual-layer structure, advanced materials, and strong environmental adaptability. With additional customization support from OMC, double sheathed cable can better meet the specific needs of FTTH and outdoor applications. It is a reliable and future-proof solution for modern fiber optic networks.
