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Specification Sheet
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Verrillon Optical Fiber

Margaret Sullivan

+1 (508) 890-7113


VHT5000 Series Gold Coating
VHT5000 Series Gold Coating

VHT5000 Multimode Series


  • Best glass resistance to hydrogen at high temperatures and pressures available in the entire industry
  • High bandwidth 50/125 graded-index multimode design for extremely short spatial resolution in sensing applications
  • Metal coating protects the fiber at temperatures up to 500°C
  • Patent-pending process prevents fibers from “cold bonding” to metal tubes or other metallic-coated fibers
  • Suitable for use in high pressure, high temperature and corrosive environments
  • Available in long lengths (multi-kilometers)
  • Industry-standard 125 μm clad diameter
  • Extensive test and measurement data for optical fiber performance under "harsh conditions" provided with fiber
  • Available in a 500°C cabled solution (see below in Documents)
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Product Description

Verrillon Harsh Environment Fibers from AFL are available in a wealth of designs. The VHT5000 product is a multimode graded-index optical fiber with optimized glass chemistry for high resistance to hydrogen darkening, coupled with a metal coating that allows the fiber to perform 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 sensing and in downstream oil processing.

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