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Optical fibers similar to those in our fiber optic artificial Christmas trees are made of extremely pure optical glass or plastic. We like to think that window glass is transparent, but the thicker the glass gets, the less transparent it becomes because of impurities in the glass.
However, the glass in an optical fiber has far fewer impurities than window-pane glass. It is so clear that if you were on top of an ocean five miles deep of solid core optical fiber glass, you could see the bottom clearly.