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The Numerical Aperture (NA) is a measure of how much light can be collected by an optical system such as an optical fibre or a microscope lens. The NA is related to the acceptance angle a, which indicates the size of a cone of light that can be accepted by the fibre.
Graded-index multimode fibers have a large NA. This is a major advantage of the product that it enables them to be used with relatively low-cost optical components.
Multimode fibers allow more modes of light to be transmitted, resulting in greater pulse spreading, or dispersion, and less bandwidth.
