An Optical Cable Loss Meter (OLTS) measures the insertion loss, length, and optical power of fiber optic cables to ensure network performance and compliance with standards.

Overview

An Optical Cable Loss Meter is a specialized instrument used to test fiber optic cables by measuring insertion loss, optical return loss (ORL), and fiber length. These meters are essential for certifying fiber installations, troubleshooting network issues, and verifying that cables meet design specifications. They are widely used in data centers, enterprise networks, PONs, and broadband systems .

Key Features

• Loss Measurement: Determines the amount of signal attenuation in dB across the fiber, including losses from splices, connectors, and fiber itself .
• Length Measurement: Calculates the physical length of the fiber, helping locate faults or verify installation distances .
• Multi-Fiber Testing: Modern OLTS devices can test up to 24 fibers simultaneously, supporting MPO, MMC, and duplex connectors .
• Bidirectional Testing: Measures loss from both ends of the fiber to improve accuracy and comply with standards .
• Wavelength Support: Typically supports multiple wavelengths (e.g., 850 nm, 1300 nm for multimode; 1310 nm, 1550 nm for singlemode) to match network requirements .
• Automated Reporting: Many meters include software for pass/fail analysis, reporting, and documentation, streamlining certification processes .

Popular Models

• Fluke CertiFiber™ Max: Measures loss, length, and polarity for up to 24 fibers in one second, with field-replaceable UniPort adapters for MPO and MMC connectors. Includes a Wizard for guided referencing and integrates with the Versiv™/LinkWare™ ecosystem .
• EXFO FOT-600: Handheld OLTS supporting simplex, duplex, and multi-fiber connectors, offering automated bidirectional testing and fast Tier-1 certification .
• Kingfisher OLTS: Multifunction tester capable of measuring loss, length, ORL, and power across multiple wavelengths with high throughput and accuracy .
• AFL FlowScout®: Combines an optical power meter and light source with Wave ID technology for simultaneous multi-wavelength testing and full reporting capabilities .

Practical Considerations

• Loss Budget: Before testing, calculate the expected loss for the fiber plant, including fiber, splices, and connectors. Typical losses are 0.3 dB per connector, 0.15–0.3 dB per splice, and 0.1–0.5 dB/km depending on fiber type and wavelength .
• Reference Setting: Accurate measurements require proper referencing, often using a one-jumper reference to minimize uncertainty .
• Standards Compliance: Ensure the OLTS supports relevant standards such as EIA/TIA-568, OFSTP-14, or FOTP-171 for consistent certification results .

Conclusion

An Optical Cable Loss Meter is a critical tool for fiber optic network installation and maintenance. Modern OLTS devices provide fast, accurate, and automated testing for multiple fibers and connector types, helping technicians ensure network reliability and compliance with industry standards .