XX/YY restricted launch

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In the launching of a lightbeam from a light source into an optical fiber, a launch with (a) a launch spot size equal to XX percent of the optical fiber numerical aperture (NA) and (b) a source aperture equal to YY percent of the optical fiber NA. See alsoaperture, coupler, coupling, launch condition, launch spot, lightbeam, light source, numerical aperture, optical fiber, source, source-to-optical-fiber coupled power, spot size.