Abstract: Optical fibers and optical fiber cables for use in high temperature applications are provided. An optical fiber for use in high-temperature applications includes a core, a cladding surrounding the core, a metal coating surrounding the cladding, and a barrier layer surrounding and in direct contact with the metal coating. The barrier layer may include a boron nitride lubricant, the barrier layer being a dried film on the metal coating, in exemplary embodiments having a thickness of between 2 microns and 20 microns. Alternatively, the barrier layer may include a synthetic metallic grease, the synthetic metallic grease in exemplary embodiments having a thickness of between 20 microns and 200 microns.

Abstract: An optical fiber and a method of fabrication thereof. The optical fiber includes a core; a cladding surrounding the core; a primary metal coating surrounding the cladding and including a noble metal having a melting point of at least 500 degrees Celsius; and a secondary metal coating surrounding the primary coating and having a melting point higher than the melting point of the primary metal coating, a thickness of the primary metal coating being greater than a thickness of the secondary metal coating.

Abstract: An optical fiber and a method of fabrication thereof.

Abstract: Optical fibers and optical fiber cables are provided. An optical fiber includes an optical fiber, the optical fiber comprising a core and a cladding, and a metal coating surrounding the cladding, the metal coating extending along the entire axial length of the optical fiber. The optical fiber further includes a powder coated on an outer surface of the metal coating, wherein the powder is one of a mineral, a ceramic, or a carbon.