Copper-coated step index multimode silica fibers (Low 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 400 to 2200 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.
|Copper-coated step index multimode silica fibers||ÎÊ-50/125Cu||ÎÊ-110/125Cu||ÎÊ-200/220Cu||
|Core diameter, µm||50 ± 3||113 ± 2||200 ± 2||300 ± 4||400 ± 5||600 ± 8||800 ± 10|
|Clad diameter, µm||
125 ± 3
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 Low OH)||14||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 Low OH)||1000 - 1600||400 - 1100||400 - 1700||400 - 2200|
|Coating material||Copper 99,99%|
|Core material||Pure syntetic silica (low OH)|
|Clad material||Doped silica (F-doped)|
|Additional inner layer||Carbon|
|Numerical Aperture (NA)||0.16 ± 0.02||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 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
FREQUENTLY ASKED QUESTIONS:
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