THERMALLY STABLE NIR FIBER OPTIC CABLE

Signal stability and low noise in remote spectroscopy depend upon fiber optics with high transmission. The transmission must be affected very little by environmental influences such as temperature, vibration, and ambient light levels. From a patented fiber design to our emphasis on high-quality materials, our GUIDED WAVE™ spectroscopic grade fiber optic cable is designed for the highest performance in transmission efficiency and durability. For near-infrared fiber, a polyimide coating and a patented silicone-based buffer protect the fiber from thermal stress.

The standard thermally stable NIR fiber optic cable receives a tough outer jacket made of Tefzel™ and inner Kevlar™ strands for strength. This rugged design prevents damage during installation.

Inexpensive 200-micron telecommunication/consumer grade fiber optic cables are not appropriate for spectroscopic applications, as they cannot bring enough light to the detector. Guided wave supplies 400-, 500-, and 600-micron fiber optic cables. The NIR-O and Clearview db are optically matched to 500 microns, as it provides the best compromise between flexibility for installation and light throughput.

MANUFACTURING HIGH PERFORMANCE FIBER

All of our NIR fiber optic cable is constructed as a core-and cladding composite. The core, the filament that guides the light, consists of a thin strand of high transmissivity fused silica. The cladding is an outer layer of doped, lower refractive index fused silica. This two-layer design keeps the light tightly confined to the central core of the fiber thus delivering a maximum amount of light at the far end. The diameter is tightly controlled during the fiber drawing process. This produces a fiber that centers extremely well in connectors and has a very low loss rate per kilometer.

Unprotected silica fiber is quite fragile. To improve the fiber’s strength and flexibility, it is coated with a polyimide material during the drawing process. Then, another protective layer is added, a carbon-loaded buffer of silicone RTV (U.S. Patent #5,381,505). The buffer reduces stray light, both external ambient light that “leaks” through the jacket and internal stray light or “cladding” modes. Finally, we add an outer protective jacket. Our “process fiber” – fiber optic cable for harsh environment applications or applications requiring long cable runs – receives a multi-layer jacket made of Tefzel™ and Kevlar™.

NIR FIBER JACKETING OPTIONS

• Process fiber cable: Tefzel™ Kevlar™
• Laboratory fiber cable: PVC-coated, steel monocoil jacket
• Armored fiber cable: Steel BX Armor with PVC Jacket (150 meter maximum length) 

AVAILABLE NIR FIBER DIAMETERS

• 200 μm (15 meter maximum length)
• 400 μm
• 500 μm
• 600 μm

FIBER TERMINATION OPTIONS

• SMA 905
• FC
• Custom (call)
• Bifurcated (call)
• Unterminated

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