Aluminum-coated single-mode optical fibers

Aluminum-coated single-mode optical fibers have all the benefits of optical fibers include increased mechanical strength and greater fatigue resistance compared to non-hermetic and polymer-clad fibers (PCS). Their transmittance covers a spectral range of 1500 to 1600 nm, and also remains stable in corrosive chemicals that normally react to silica glass. 

Please see frequently asked questions below.


  •  Excellent mechanical strength and flexibility compared to polymer coated fibers.
  •  The temperature range is from -196C to +400C.
  •  The metal coating can be soldered.



Aluminum-coated single-mode optical fiber ОК-6/125AL ОК-9/125AL
Fiber type Single mode Single mode
Core diameter,  µm 6.8 ± 0.5 9.1 ± 0.5
Mode field diameter (Gauss), µm 7.5 ± 0.6 10.0 ± 0.6
Clad diameter, µm 125 ± 1
125 ± 1
Coating diameter, µm 170 ± 5 170 ± 5
Cladding offset, % < 2 < 2
Coating offset, % < 5 < 5
Attenuation at 1550 nm1, dB/km < 7.0 < 7.0
Wavelength range, nm 1500 - 1600 1500 - 1600
Cutoff wavelength, nm < 1450 < 1450
Coating material Aluminium Aluminium
Core material Silica Ge-doped Silica Ge-doped
Clad material Silica Silica
Numerical Aperture (NA) 0.16 ± 0.02 0.13 ± 0.02
∆ n 0.009 ± 0.001 0.005 ± 0.001
Short-term bending radius, mm  10  10
Long-term bending radius, mm ≥ 25 ≥ 25
Proof test, kpsi 100 100
Min operating temperature2,3, C -196 -196
Max operating temperature2, C 400 400

1- under normal climatic conditions

2- in inert environment

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

Aluminum-coated single-mode optical fibers



What is the loss value in Aluminum 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. That said, we have relatively low-loss single-mode fibers that are comparable to standard single-mode fibers. 

How Aluminum 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 Aluminum coated fibers?

Once the Aluminum 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?

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

Do you offer heat-resistant cables?

Yes, we manufacture high temperature (up to 400 degrees) stainless steel braided cables. the maximum number of fibers in a cable is 24.