Optical Fibers / Optical Fibers

All Sarspec fiber-optic cables are built with a numerical aperture (N.A.) of 0.22 and uses standard SMA 905 connectors for easy coupling, without the need of any optical alignment with spectrometers, light sources and sampling accessories. 

It’s important to select some key specifications in order to get the right optical fiber, namely: wavelength range, core diameter, length, jacketing and type (patch cord or bifurcated).

In the tabs below is given a simple explanation about the components and specifications of our optical fibers as well for how to configure an optical fiber.

Even though the information focus on standard products, it’s important to mention that as a manufacturer Sarspec can build specific solutions that matches customer's requirements.

The basic structure of an optical fiber can be described as:

1. Core 
Made of pure fused silica, it’s the medium for light transmission. Depending on the OH (Hydroxyl ions) content present on the fiber, there are two specific wavelength range regions: high-OH content fibers are used in the UV/Vis region and low-OH content fibers are used in the Vis/NIR region. For UV applications it’s important to use solarization resistant fibers and for that all Sarspec optical fibers for the UV are solarization resistant offering more durability and wider wavelength range. 
The core diameter is crucial for the best performance on each configuration, larger diameter means more light into and out of the sample. For applications such as Fluorescence, Raman and Reflectance (for low reflectivity samples) we advice large core optical fibers. Sarspec has available the following core diameters: 200, 400, 600 and 1000 µm.

2. Cladding
Fluorine doped silica layer, surrounding the core and with lower refractive index than the core, confines the light in the core of the fiber by total internal reflection at the boundary between the two.

3. Buffer
The buffer is used mainly for adding mechanical resistance to the optical fiber protecting it from physical damage. As standard Sarspec’s use silicone as buffer for the best resistance at low and high temperatures and to solvents

4. Jacket
The jacket is the external layer of the optical fiber and it’s function is to protect the fiber and ensure strain relief. For optical fiber jacketing Sarspec can supply two options: kevlar reinforced PVC monocoil for standard non harsh environments or Stainless Steel for a superior degree of fiber protection.

5. SMA 905 Connector 
Sarspec uses SMA 905 connectors in all instrumentation and fiber-optic cables for coupling the different components without the need of any optical alignment.


Patch cords:

We offer a wide range of multi-mode fiber-optic patch cords, in a variety of core diameters and lengths. This type of cables are used to interconnect all our equipments, having at both ends the universal optical connector, SMA 905. It is also possible to choose the transmission spectral region, UV/Vis or Vis/NIR, and the type of protection Jacket, PVC or steel.



Bifurcated fibers are mainly used to illuminate two samples with one light source assuring that equal illumination is delivered to both or collect light for two spectrometers with different wavelength ranges / resolutions / sensitivities / acquisition speeds.
Bifurcated bundles use two optical fibers with pre defined core diameter and wavelength range (equal or different) with two sections in one end and one section in the other end where they are put side by side using the same SMA 905 connector. 

General Specifications
  UV/Vis Vis/NIR
Material Pure fused silica
OH content High-OH Low-OH
Cladding Fluorine doped silica
Wavelength range 180-200 nm 300-2400 nm
Core diameters 200, 400, 600 and 1000 µm
Length 50, 200 cm or user difined
Jacket Kevlar reinforced PVC or stainless steel
Available types Patch cord or Bifurcated
Connector SMA 905
Temperature range -20º to 60º C for PVC and -65º to 250º C for stainless steel
Fiber external diameter 3.8 mm for PVC and 5.0 mm for stainless steel

Please configure the desired Optical Fiber:




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