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Multimode Fiber Certification: Light Source Launch Conditions and Encircled Flux Standard

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Multimode Fiber Certification: Light Source Launch Conditions and Encircled Flux Standard

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  • Author: Varis C. Hicks
A multimode light source with controlled launch conditions ensures accuracy, reproducibility and consistent loss readings. The type of light source used for multimode fiber-link certification and the way it is coupled to the fiber greatly affects the launch conditions. Generally, surface-emitting LED sources overfill the fiber, while edge-emitting light sources (EELS), including LED and laser sources, have a smaller spot size, numerical aperture and emission, which means they significantly underfill the fiber. Vertical-cavity surface-emitting lasers (VCSELs) are similar to laser light sources and also underfill the fiber

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