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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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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.

Numerical Aperture

The range of acceptance angles rotated around an axis, where light can be coupled into a waveguide such as the core of an optical fiber.

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