High Performance Fiber Optic Light Cables HTT BlueLine

High-Performance Fiber Optic Cables

Technical data

The HTT-Blue-Line® high-performance fiber optic cable by RfQ features the following benefits in comparison with conventional fiber optic cables:
  • approx. 20% higher transmission
  • temperature resistance at the point of light entry
  • highly flexible despite cable armor

The reasons for this are as follows:

A conventional fiber optic cable with an optically active diameter of 3.5 mm has approx. 4,000 optical fibers; the diameter of the individual fiber is 50µm.

Area, light entry 1.75mm x 1.75mm x 3.14 = 9.62mm
Area, fibers 0.025mm x 0.025mm x 3.14 x 4000 = 7.85mm

The light entry of conventional fiber optic cables is thus filled only up to approx. 80% (7.85: 9.62 = 0,82) with fibers; the spaces in between are usually filled out with organic adhesives.
With HTT-Blue-Line® cables, the optical fibers are melted and pressed in at the light entry by a special procedure; the fibers are hexagonally deformed; the spaces in between disappear, and the glass share adds up to 100%. The transmission increases proportionally. Since there are no organic adhesives anymore, these new fiber optic cables no longer “burn” at the light entry, which used to be a typical cause of failure with conventional cold-light cables; so the high-performance fiber optic cables are extremely temperature resistant at the point of light entry. Owing to the melting and pressing, the optically active diameter of a 3.5 fiber optic cable is reduced to around 3.2mm (actually root of [3.5 x 3.5] x 80% = 3.13).

verklebte Fasern / glued fibers verschmolzene Fasern / fused fibers

The HTT-Blue-Line® cables are particularly effective in XENON cold-light sources. These light sources focus the light at a very small focal point that has the size of the light entry area of the HTT-Blue-Line® cable. Under these conditions, the adhesive-free light entry area of the HTT-Blue-Line® cable absorbs the maximum possible light intensity (20% more). This effect does not usually occur with cold-light sources with halogen reflector lamps.

The explanation for this is the following:
Halogen reflector lamps focus the light on a relatively large focal point (e.g. 6 mm); a conventional light fiber optic cable with an active diameter of 3.5 mm contains the aforementioned 4,000 optical fibers. So all fibers are optimally lit in a 6-mm focal point; in other words, the 6-mm focal point is only approx. 30% utilized (3.13 x 3.13): (6 x 6) x 100 = 27%.

So the transmission-heightening impact of the HTT-Blue-Line® cable becomes effective only if a small (suitable) focal point exists, because the extant fibers that have replaced the adhesive contribute to the light transmission (20%). Given a large focal point of the cold-light source and a small light entry area in the fiber optic cable, only a small portion of the light is coupled into the fibers; the effective light intensity at the end of the fiber optic cable is low. Under such conditions, however, it's irrelevant at which spot of the focal point (e.g. 6-mm focal point) the fibers are arranged; whether pressed or glued—every fiber is lit.

The light intensity measurable at the light exit will be the same in both cases. With a 3.2 light entry and a 3.2 focal point, things look different. If the light entry of the fiber optic cable is melted, the entire area is lit and the light is optimally transmitted owing to the maximum packing density of the fibers. If the light entry of the fiber optic cable is glued, the entire area is lit, but the light now also hits the glued joints, which of course are optically inactive; as a consequence, the measurable light intensity at the fiber optic cable end is reduced, namely corresponding to the 20% of fibers that were replaced by adhesive.

In any case, it's safe to assume, however, that the fiber melting at the light entry of a fiber optic cable essentially heightens its durability life, since a glass area can stand up better and longer to the alternating influences on the fiber optic cable such as
  • high temperatures in the light source
  • disinfecting
  • autoclaving
  • cooling or heating during the above-mentioned processes
than a glued fiber area can do.


The fibres of the HTT-Blue-Line® high-performance fiber optic cables are not fixed by glue, but by a special system using high pressure and heat.

As a result, these cables have two important additional characteristics:

1.) Approximately 20% higher light transmission compared to Standard Cables
2.) Resistant to high temperatures such as Xenon Light Sources.
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