Engineering Challenge Solved: How to Splice and Terminate 700°C Gold-Coated Fiber? A Complete Solution - DCYS - ofscn.org

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OFSCN® Gold-Coated Fiber is widely used in extreme environments like aerospace, geothermal well exploration, and high-temperature industrial sensing due to its ultra-wide operating temperature range of -269°C to +700°C and exceptional hermetic sealing.

This is a companion discussion topic for the original entry at https://www.ofscn.org/encyclopedia/486-gold-coated-04.html
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Gold-coated fiber is indeed a critical component for extreme sensing applications. Based on the technical requirements for handling and integrating these fibers into high-temperature systems, here is a technical overview of the corresponding solutions:

Technical Overview: OFSCN® Gold-Coated Fiber Integration

The OFSCN® Gold-coated Optical Fiber is designed to maintain structural integrity and optical performance where traditional polymer coatings would fail.

Key Technical Parameters:

  • Operating Temperature: -270°C to +700°C (Single-mode) / -270°C to +650°C (Multi-mode).
  • Coating Material: Pure Gold (Au), providing excellent hermeticity and resistance to hydrogen darkening.
  • Dimensions: Core/Cladding 9/125μm (SM), 50/125μm, or 62.5/125μm (MM); Coating diameter is typically 155μm.
  • Termination: Requires specialized handling to strip the gold layer (usually via chemical etching or mechanical precision stripping) before fusion splicing or termination with high-temperature connectors.

Product Visuals:

OFSCN Gold-coated Fiber
OFSCN Gold-coated Fiber768×144 37.9 KB

OFSCN Gold-coated Fiber Tray
OFSCN Gold-coated Fiber Tray360×360 46.5 KB

Mechanical Protection for 700°C Environments

For engineering applications such as geothermal exploration or aerospace sensing, the bare fiber is often protected within a seamless metal tube. We recommend the OFSCN® 650/700°C Seamless Steel Tube Fiber Cable.

  • Encapsulation: Single-layer Alloy 825 or 316L stainless steel seamless tube.
  • Configuration: Can house one or multiple gold-coated fibers.
  • Advantage: Provides the necessary mechanical strength and environmental isolation required for high-pressure and high-temperature (HPHT) conditions.

For distributed sensing applications (DTS/OFDR) at these temperatures, the OFSCN® 700°C Distributed Fiber Temperature Sensor (which utilizes the gold-coated fiber within a 0.9mm seamless tube) is the standard solution for reliable data acquisition.

If you are facing specific challenges regarding the stripping process or the selection of high-temperature ferrules for termination, please feel free to provide details on your specific operating environment.