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Throughout AFL’s years of manufacturing fiber optic cables with Corning® fiber, many improvements have been made to the fiber resulting in a change in the fiber identification version. Table A below is quick at-a-glance of the evolution of Corning single-mode (SM) fiber since the SMF-28® inception in 2001. All versions of Corning SM fiber are backward compatible to each other. The latest version of Corning SM fiber is SMF-28 Ultra. This fiber has the added benefit of being bend insensitive with a typically lower fiber attenuation along with all the other properties of the previous SMF-28e+® LL fiber.