Optical fibers with various protective coatings were submerged in liquid nitrogen to 77°K then tested for mechanical and optical reliability.  While all the fibers maintained strength after low-temperature exposure, the optical response varied depending on the protective coating.|Optical fibers with various protective coatings were submerged in liquid nitrogen to 77°K then tested for mechanical and optical reliability.  While all the fibers maintained strength after low-temperature exposure, the optical response varied depending on the protective coating.

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