Index Matching Material
A substance, usually a liquid, cement (adhesive), or gel with refractive index similar to glass used to match the materials at the ends of two fibers to reduce loss and back reflection. Index Matching Material has an index of refraction that nearly equals that of the fibers core. Used to reduce Fresnel Reflection loss at fiber ends. Also known as index matching gel or index matching material, it is used to enhance the transmission of light across the joint.
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