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EMA EMA refers to a dark, Extra-Mural Absorption glass that is placed into the fiber matrix to absorb stray photons not contained by the individual fibers. This results in a significant reduction in fiber cross-talk. EMA can be inserted into a fiberoptic array in several different configurations, including statistical, interstitial, and circumferential. In a statistical configuration, small rods of light-absorbing glass are inserted into the matrix as replacements for individual light-conducting fibers. Interstitial EMA is inserted into the interstitial spaces between fibers, and circumferential EMA is added as a complete jacket around each individual fiber. The different configurations provide varying degrees of absorption, proportional to the total volume and optical density of the EMA glass.
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