Posted in | Optical Fiber

Copper Alloy Coated Silica Fibers

The Copper Alloy Coated Silica Fibers are the optimal solution when used in high temperature, vacuum and harsh environmental conditions. Hermetically sealed fibers have all the benefits of silica-silica fibers. Additional significant improvements include increased mechanical strength and greater fatigue resistance compared to non-hermetic polymer-clad fibers.

The transmission covers a spectral range of 220 to 2400 nm depending upon a UV or NIR silica fiber core choice Cu-alloy coated fibers remain stable in corrosive chemicals that normally react to silica glass. The temperature range is from -270°C to 600°C with a humidity range of up to 100%.


Specification of Cu-alloy coated Fibers
Core/ Cladding material Step Index Pure Fused Silica Core / Fluorine Doped Silica Cladding
Graded Index Germanium Doped Fused Silica Core / Pure Fused Silica
Standard fiber core diameters, μm 9; 50; 62.5; 200; 400; 600;
Cu-alloy coating thickness, μm 15 – 50
Standard Numerical Aperture (NA) 0.22 ± 0.02
Available Numerical Aperture (NA) 0.12 ± 0.02
0.26 ± 0.02
Min operating temperature, °C -270
Max operating temperature, °C +600
Humidity Range Up to 100%
Minimal bending radius (long term) 200 x fiber outer diameter
Minimal bending radius (short term) 100 x fiber outer diameter
Tensile strength (short gauge), GPa 3.5 – 6
Two point bending strength, GPa >10
Static fatigue parameter >100



  • High-temperature environments
  • Medical applications
  • Nuclear radiation resistant devices
  • Harsh chemical surroundings
  • Soldered fiber bundles
  • Down-hole sensing for oil and gas sector
  • High Power Laser delivery

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