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Variations in the launch conditions of multimode light sources are well known. Prior tothe introduction of encircled flux, the mandrel wrap or mode filter was required for light sources that did not meet the launch requirements of ANSI/TIA-455-78-B. It was required because the attenuation in a short link of multimode optical fiber may be higher than calculated when making insertion loss measurements due to the power lost in the high-order modes. The high-order modes are caused by an LED light source that overfills the optical fiber.Even when light sources met the launch requirements of ANSI/TIA-455-78-B, it was still difficult to get repeatable insertion loss measurements from one piece of test equipment to another. The variations obtained with different pieces of test equipment combined with the reduced channel attenuation led to the development of encircled flux requirement.
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