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The outer sheath of optical cables can suffer from manufacturing defects, mechanical damage, and environmental degradation, all of which compromise cable performance and longevity.
Manufacturing Defects
During production, the outer sheath may develop pores, pinholes, bubbles, bulges, or slubs due to issues in the extrusion process. Common causes include uneven temperature, pressure, or speed, poor material mixing, contamination, or misalignment of the extrusion crosshead. These defects can reduce insulation performance, mechanical strength, thermal stability, and aging resistance, leading to higher rework rates, increased costs, and lower product reliability .
Mechanical and Environmental Damage
Once deployed, the sheath can be damaged by bending, crushing, or improper pulling, which may create micro-cracks or deform the jacket. Rodent attacks, tight ties, or heavy equipment can also compromise the sheath. Environmental factors such as moisture ingress, UV exposure, and temperature fluctuations accelerate aging and may allow water or contaminants to reach the fiber core, causing signal attenuation, insertion loss, or complete link failure .
Material-Related Issues
The choice of sheath material affects durability. HDPE is preferred for outdoor exposure due to its long service life, while LDPE offers flexibility but is less resistant to harsh conditions. LSZH is fire-safe but not ideal for long-term outdoor use. Using the wrong material can lead to accelerated aging, regulatory issues, or repeated replacements .
Consequences
Problems with the outer sheath can result in reduced signal quality, increased maintenance costs, and network downtime. Even minor surface defects or micro-cracks can allow moisture or contaminants to reach the fiber, causing attenuation, modal dispersion, or complete signal failure, which is critical in high-speed networks like FTTH or 5G .
Prevention and Mitigation
- Ensure proper material selection based on deployment conditions.
- Maintain precise extrusion parameters and thorough material mixing during manufacturing.
- Protect cables in the field with armored jackets, correct bend radius, and sealed connectors.
- Conduct routine inspections using visual fault locators or OTDR testing to detect early sheath damage . By addressing both manufacturing and field-related issues, the integrity of the optical cable sheath can be preserved, ensuring reliable long-term performance.
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