A gelatinous substance with an index of refraction (IOR) that closely matches that of the core of an optical fiber. Mechanical splices and connectors are filled with index-matching gel to reduce Fresnel reflections from a fiber end face. See also connector, core, Fresnel reflection, IOR, mechanical splice, and optical fiber.
index-matching gel - Computer Definition

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Used by arrangement with John Wiley & Sons, Inc.
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"index-matching gel." YourDictionary, n.d. Web. 03 February 2019. <https://www.yourdictionary.com/index-matching-gel>.
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index-matching gel. (n.d.). Retrieved February 03rd, 2019, from https://www.yourdictionary.com/index-matching-gel