Copper-coated gradient index multimode optical fibers

High strength metal-coated silica fibers

Copper-coated gradient index multimode optical fibers have increased mechanical strength and greater fatigue resistance compared to non-hermetic and polymer-clad fibers (PCS). Their transmittance covers a spectral range of 1000 to 1600 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.



  •  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.


Fiber Specifications:

Copper-coated gradient index multimode silica fibers -50/125Cu-Gr -50/200Cu-Gr -100/140Cu-Gr
Fiber type Multimode Multimode Multimode
Index profile Gradient Gradient Gradient
Core diameter,  µm 50 ± 2.5 50 ± 2.5 100 ± 2 
Clad diameter, µm
125 ± 3
200 ± 3
140 ± 2
Coating diameter,  µm 160 ± 10 250 ± 10 ~ 210 ± 10
Cladding offset, % < 3
Coating offset, % < 5
Attenuation at 850/1300 nm1, dB/km ~ 13 ~ 5 ~ 15
Wavelength range, nm 1000 - 1600 
Coating material Copper 99,99%
Core material Silica Ge-doped
Clad material Pure silica
Additional inner layer Carbon
Numerical Aperture (NA) 0.2 ± 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 temperature 2,3, C -196
Max operating temperature (short time < 60s)2, C 600
Max operating temperature (long time 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 gradient index multimode optical fibers



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