1 Specialty Optical Fiber © 2020, AFL, all rights reserved. PP-6-00026, Revision 2, 8.20.2020 Specifications are subject to change without notice. AFLglobal.com | 800.235.3423 Features • Metal coating protects the fiber at temperatures up to 500°C • Optimized for 1550 nm operation • Pure Silica Core chemistry for improved performance in hydrogen-rich environments • Greater than 50x bend loss improvement at 1550 nm over standard SMF • MFD compatible with standard SMF for ease of splicing and minimal splice loss • Patent-pending process prevents fibers from “cold bonding” to metal tubes or other metallic-coated fibers • Available in long lengths (multi-kilometers) • Industry-standard 125 μm clad diameter VHT500 Ultra-High Temperature Single-mode Series Verrillon VHT500 is a pure silica core single-mode design with a protective metal coating that allows it to operate at temperatures up to 500°C. Typically, these fibers are used in down-hole data logging for enhanced supercritical geothermal applications, high- temperature oil/gas downhole monitoring using acoustic, strain and temperature sensing, and downstream oil process monitoring. Specifications PART NO. VHS-60-CM-125-1 Description Ultra-High temperature metal-coated Single-Mode fiber with low-loss suitable for use up to 500°C. Available in multi-kilometer continuous lengths and proof-tested at 50 kpsi. PARAMETER Material Core Pure Silica Cladding F-doped Silica Coating Carbon / Metal Geometry Core Diameter (μm) - Clad Diameter (μm) 125 ± 2 Clad Non-Circularity (%) ≤ 3 Core/Clad Offset (μm) ≤1.5 Coat Diameter (μm) 131 +5 / -2 Optical NA (nominal) 0.12 Attenuation @ 1550nm (dB/km) ≤ 5 Cutoff Wavelength (nm) ≤ 1530 Mode Field Diameter (μm) 10.0 ± 0.7 Mechanical Prooftest (kpsi) ≥ 50 Operating Temperature (°C) -65 to +500 Continuous Length Available Multi-kilometers