Copper-coated step index multimode optical fibers (High OH)

High strength metal-coated silica fibers

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

Please see frequently asked questions below.



  •  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.













Attenuation spectrum


Fiber Specifications:

Copper-coated step index multimode silica fibers















Mode type MM MM MM MM MM MM MM
Index profile step step step step step step step
Core diameter,  µm 105 ± 2  113 ± 2  200 ± 2  300 ± 4  400 ± 5  600 ± 8  800 ± 10 
Clad diameter, µm 125 ± 2
125 ± 2
220 ± 2
330 ± 4
440 ± 5 660 ± 8 880 ± 10
Coating diameter,  µm 160 ± 10 160 ± 10 280 ± 10 420 ± 10 545 ± 10 775 ± 10 980 ± 10
Cladding offset, % < 2
Coating offset, % < 5
Attenuation at 800/1300 nm1, dB/km (See grapf  High OH) the loss spectrum in the long wavelength region ( > 1um) is higher than that of the material  the loss spectrum is close to the material loss spectrum
Wavelength range, nm (See grapf High OH) 250 - 1100  250 - 1200 
Coating material Copper 99,99%
Core material Pure syntetic silica (High OH)
Clad material Doped silica (F-doped)
Additional inner layer Carbon
Numerical Aperture (NA) 0.22 ± 0.02
Short-term bending radius 60 times the fiber diameters
Long-term bending radius 120 times the fiber diameters
Proof test, kpsi 100
Min operating temperature2,3, C -196
Max operating temperature (short tume < 60s)2, C 600
Max operating temperature (long tume 60s)2, C < 400
Permissible rate of temperature change in the temperature range, C/min 5

1- under normal climatic conditions

2- in inert environment

3- at the minimum operating temperature, the integrity of the optical fiber is guaranteed

Copper-coated step index multimode silica fibers (High OH)




What is the loss value in metal coated fibers?

Metallic coated fibers have higher losses than standard telecommunication fibers because when radiation passes through the fiber, small currents arise on the metal surface. In multimode fibers, where the metallic cladding is located at a large distance from the core, losses are less than in fibers with a smaller cladding diameter.

How metal coating is removed?

The metal coating from the fibers is removed by a chemical method. For example, immersing the fiber in a solution of ferric chloride followed by wiping with a lint-free cloth soaked in alcohol

Is it possible to metallize or recoat certain part of the fiber?

Yes, we can recoat the cleaned area. The length of the area with the recoated coating does not exceed 100 mm

What about splicing and termination metal coated fibers?

Once the metal coating has been removed, the fibers can be cleaved, spliced and terminated like standard telecommunications fiber. We manufacture patchcords with standard connectors

Are the fibers solderable?

Metal coated fibers can be brazed using a variety of solders using standard technologies