Copper-coated step index multimode optical fibers
(High OH)
Copper-coated step index multimode optical fibers have all the benefits of silica-silica fibers. Additional significant improvements include increased mechanical strength and greater fatigue resistance compared to non-hermetic and polymer-clad fibers (PCS). Their transmittance covers a spectral range of 250 to 1200 nm, and also remains stable in corrosive chemicals that normally react to silica glass. The temperature range is from -196C to +600C . Hermetically metal-coated optical fibers are the optimum candidate when used in high vacuum and harsh environmental conditions


  • Greatly enhanced resistance to high power laser radiation.
  • Higher core-to-clad ratio and enlarged NA optimized for coupling to high-energy lasers.
  • Better fiber cooling due to the heat-conducting metal coating.
  • Excellent mechanical strength and flexibility compared to polymer coated fibers.
  • The metal coating can be soldered and will not outgas.


Copper-coated step index multimode silica fibersОКM-105/125CuОКM-110/125CuОКM-200/220CuОКM-300/330CuОКM-400/440CuОКM-600/660CuОКM-800/880Cu
Index profileStepStepStepStepStepStepStep
Core diameter, µm105 ± 2113 ± 2200 ± 2300 ± 4400 ± 5600 ± 8800 ± 10
Clad diameter, µm125 ± 2125 ± 2220 ± 2330 ± 4440 ± 5660 ± 8880 ± 10
Coating diameter, µm160 ± 10160 ± 10280 ± 10420 ± 10545 ± 10775 ± 10980 ± 10
Cladding offset, %< 2
Coating offset, %< 5
Attenuation at 800/1300 nm 1, dB/km (See grapf High OH)the loss spectrum in the long wavelength region ( > 1um) is higher than that of the materialthe loss spectrum is close to the material loss spectrum
Wavelength range, nm (See grapf High OH)250 - 1100250 - 1200
Coating materialCopper 99,99%
Core materialPure syntetic silica (High OH)
Clad materialDoped silica (F-doped)
Additional inner layerCarbon
Numerical Aperture (NA)0.22 ± 0.02
Short-term bending radius60 times the fiber diameters
Long-term bending radius120 times the fiber diameters
Proof test, kpsi100
Min operating temperature 2,3, C-196
Max operating temperature (short tume < 60s)2, C600
Max operating temperature (long tume > 60s) 2, C< 400
Permissible rate of temperature change in the temperature range, C/min5
1- under normal climatic conditions
2- in inert environment
3- at the minimum operating temperature, the integrity of the optical fiber is guaranteed
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