The Fibrlok II mechanical splices are filled with what to maximize light transfer and reduce Fresnel reflections?

The correct response highlights that Fibrlok II mechanical splices use index matching gel to optimize light transfer and minimize Fresnel reflections at the optical interfaces. Index matching gel works by ensuring that the refractive index of the gel closely matches that of the optical fibers being joined. This alignment reduces the reflection of light at the splice point, which can occur when light travels between materials of different refractive indices. By facilitating a smoother transition of light through the splice, the index matching gel enhances the performance of the fiber optic connection, enabling more efficient signal transmission with less loss.

Other options include materials like silicone grease, optical epoxy, and acrylic resin, which serve different purposes in fiber optic applications but do not effectively achieve the specific function of reducing Fresnel reflections and maximizing light transfer in the same way index matching gel does. For instance, silicone grease can provide some level of moisture protection or a temporary environment, but it does not create the optical continuity necessary for minimizing reflection. Meanwhile, optical epoxy is typically used for permanent bonding of fibers rather than facilitating the temporary alignments needed in a mechanical splice. Acrylic resin, while it might have some applications in fiber optics, is not tailored for the specific needs of splicing.