COVID-19: As a designated essential telecom solutions provider, EXFO remains fully operational with our employees' health and safety as our top priority.

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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.


The steady decrease or loss of signal power in an optical fiber, primarily due to absorption and scattering. Attenuation is wavelength dependent, measured in decibels (dB) and can be converted to decibels per kilometer or dB/km.

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