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Glossary

Technology evolves at a rapid-fire pace. That’s why we’ve built an easy-to-use glossary to help you better understand the terms, technologies and trends that impact your business.

Optical Fiber Multimeter (OFM)

An optical fiber multimeter (OFM) is an essential tool for technicians testing optical fiber. It measures key optical parameters (power, insertion loss, optical return loss and length) to verify fiber optic link health.

The interpretation of those key parameters allows technicians to diagnose basic issues. For example, no power indicates discontinuity; low power or high IL means excessive attenuation; and high ORL shows excessive reflectance.

The source and location of issues can be determined with further analysis and frontline technicians would need additional tools (e.g., VFL, fault locators or OTDRs) to find out if high IL is caused by a bad splice or a macrobend, or if the high ORL is due to a dirty connector or bad mating.  

Top-shelf OFMs include fault-finding capabilities, i.e., when issues are suspected during the verification of the link health, the unit locates and diagnoses common faults automatically in addition to identifying the causes. Such OFMs empower technicians of any experience level to perform on-the-go troubleshooting in addition to the end-to-end sanity check of the installation.