Verrillon Harsh Environment Fibers from AFL are available in a number of designs. Starting with fiber design, we offer both singlemode and multimode optical fibers having coatings and coating combinations, including Polyimide, Silicone-PFA and Carbon. Typically, these fibers are used in down-hole data logging, distributed sensing and imaging applications. Verrillon coated fibers provide exceptionally high levels of hermeticity compared to commercial fibers. We provide extensive data that demonstrates the performance of our fiber. In addition, we provide one-stop shopping for customers requiring multi-count cabled hermetic fibers, if required, in metal jacketing tubes.