How to Avoid Microbend Loss During Outdoor Armored Fiber Optic Cable (GYFTY) Installation？
We all know that microbend loss is a significant concern when installing outdoor armored fiber optic cables, particularly the GYFTY model, which is commonly used for telecommunications, broadband networks, and industrial applications. Microbends can cause excessive signal attenuation, leading to decreased performance and reliability of the network. So how to avoid microbend loss issues during the installation of GYFTY cables and ensure optimal performance throughout the lifespan of the network? Hunan Jiahome provide suggestions as below:
1. Understanding Microbend Loss in Fiber Optic Cables
Microbend loss occurs when the fiber optic cable is subjected to tight bends, pressure, or other physical stresses during installation or operation. These stresses cause small, localized deformations in the cable, resulting in light being lost or scattered as it travels through the fiber core. In outdoor environments, the risk of microbend loss is higher due to the cable’s exposure to various elements, such as temperature fluctuations, physical pressure, and environmental stresses.
The GYFTY armored fiber optic cable is designed with a steel or aluminum wire armor to protect the cable from mechanical damage. However, this armored layer can also exacerbate microbend loss if the installation is not handled carefully.
2. Proper Cable Handling During Installation
One of the primary causes of microbend loss is improper handling of the fiber optic cable during installation. The GYFTY model, being a robust armored cable, can be more rigid than non-armored cables, which makes it susceptible to bends and twists. To avoid microbend loss, follow these best practices:
Avoid Sharp Bends: Ensure that the cable is not bent beyond its minimum bend radius, which is specified by the manufacturer. The minimum bend radius is the smallest radius around which the cable can be safely bent without causing microbends. For GYFTY cables, this is typically 20 times the cable’s outer diameter, but it is essential to check the manufacturer’s specifications for accurate measurements.
Smooth Installation Path: When we laying the cable, use smooth and gradual curves to avoid sharp angles. If the installation path requires a curve, make sure the bend is broad and gradual, reducing the risk of excessive pressure on the cable core.
Use Proper Tools: We should always use the correct tools for cable installation, such as cable reels, hoists, or pullers, to prevent pulling the cable too tightly. Over-pulling can stretch the cable and lead to microbends. Additionally, avoid dragging the cable across rough surfaces that could damage the armor or induce unwanted bends.
3. Careful Cable Tension Management
Excessive tension applied to the fiber optic cable during installation can result in microbend loss. The tension may cause the cable to stretch or twist, which can create minute bends along the fiber, degrading the quality of the transmitted signal. To manage cable tension effectively:
Monitor Tension: Always monitor the cable’s tension during installation. Follow the manufacturer’s recommended tension limits to ensure the cable is not overstretched. A cable tension meter can help gauge the amount of force being applied.
Use Tension Relief: Install tension relief devices, such as pulleys or rollers, at appropriate intervals to distribute the load evenly along the length of the cable. These devices help prevent the cable from being under excessive strain during installation.
4. Consider Temperature and Environmental Factors
The installation environment plays a crucial role in preventing microbend loss. In outdoor settings, temperature changes and environmental conditions such as humidity, wind, or even rain can affect the performance of fiber optic cables. Extreme temperatures can cause the cable to expand or contract, potentially leading to microbends. Here’s how to mitigate these issues:
Install During Moderate Weather: If possible, perform installations during mild weather conditions to reduce the impact of temperature extremes. Avoid installing cables during extreme heat or cold, as this can cause the cable to become more brittle and more susceptible to bends.
Allow for Cable Expansion and Contraction: Ensure that there is enough slack in the cable to accommodate natural expansion and contraction due to temperature fluctuations. Installing the cable too tightly can prevent it from adjusting to these changes, leading to unnecessary pressure on the fiber.
5. Support Structures and Cable Laying Techniques
The use of appropriate support structures during installation is essential in preventing microbend loss. Support systems, such as cable trays, conduits, or hangers, help maintain proper cable alignment and avoid excessive bends. Proper cable laying techniques also contribute to long-term performance.
Install Cable on Supports: Use cable trays, poles, or other forms of support to ensure that the cable is properly aligned and supported. This prevents it from sagging or becoming too taut, which could cause microbends.
Avoid Stress at Joints: We can pay special attention to cable joints and connections. Ensure that any splicing or jointing points are made without applying undue pressure to the fiber. Microbends at these points can significantly impact signal quality.
Spacing of Supports: For longer runs of cable, place support structures at regular intervals to prevent the cable from hanging loosely or sagging. This helps maintain a uniform tension across the entire length of the cable.
6. Post-Installation Testing and Maintenance
Once the GYFTY cable is installed, it’s essential to conduct post-installation testing to check for microbend loss and ensure that the network performs optimally. Regular maintenance can also help identify and correct issues before they cause significant degradation.
Optical Time Domain Reflectometer (OTDR) Testing: Use an OTDR to test the cable for any signs of microbend loss or other types of signal degradation. This device can help pinpoint problem areas where attenuation may be occurring due to microbends.
Periodic Inspections: Regularly inspect the installation to ensure that the cable is not subjected to excessive stress or movement. Look for signs of wear, damage, or potential bending that could impact the fiber’s performance.
Microbend loss is a critical issue in the installation of outdoor armored fiber optic cables like the GYFTY model. By following proper installation practices—such as managing cable tension, avoiding sharp bends, ensuring smooth cable handling, and considering environmental factors—installers can significantly reduce the risk of microbend loss. Furthermore, regular testing and maintenance will ensure the cable continues to perform optimally over its service life. By taking the right precautions, businesses and network operators can
Post time: Feb-13-2025