The FGC range is the complete solution for measuring the dimensions of standard and specialty fiber in both production and R&D environments.
FGC-GS measures fiber glass geometry for fibers up to 800 µm diameter.
Features and Benefits
- Measures the widest range of fiber sizes and types – single unit solution means less bench space, reduced training
- Standards compliant – calibrated to international standards, ensuring confidence in its accuracy
- Production ready – reliable, repeatable, operator-independent results in seconds

High Image Quality
The FGC uses a Darkfield Imaging system which gives a clear image of the
fiber end face, and with our high quality optics and camera users are able to
measure the widest range of fibers, from standard fibers to specialty fibers.

Production-Ready Software
The FGC software allows users to quickly and easily get both core and cladding geometry measurements including diameter, non-circularity and concentricity. The software contains measurement templates for all standard telecoms fibers. Users can also create their own templates and measure many special fiber types including dual clad fiber, bend insensitive fiber, multicore fiber, polarisation maintaining fiber and many more.
Polarisation Maintaining fiber | ![]() | Octagonal fiber | ![]() | Dual clad fiber | ![]() |
Micro-structured fiber | ![]() | Multimode fiber | ![]() | Multicore fiber | ![]() |
The latest release v5.7 of FGC software is applicable to the FGC-GT and FGC-GS optical units.
Feature | Benefit |
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MCF Measurement | Enables more flexible measurement of up to 19-core multicore fibers, including markers |
Change of field of view | Enables change of field of view in main UI |
Inner-outer Cladding Concentricity | Enables measurement of Inner-Outer cladding concentricity for dual-clad fibers |
Screen shots
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Optical | FGC-GS |
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Max Field of View | 900 µm |
Fiber Illumination – Reflection* | Darkfield illumination, 525 nm LED 850 nm and 525 nm dual wavelength illumination (FGC-GS-D) |
Fiber Illumination – Transmission* | Multiple LED array, 525 nm 850 nm and 525 nm dual wavelength illumination (FGC-GS-D) |
Measurement Capability | |
---|---|
Measurement Time | < 10 seconds (excluding fiber preparation) |
Fiber Diameter | up to 800 µm |
Special Fibers | Dual clad, Octagonal, Polarisation Maintaining, Multicore, Photonics crystal fiber, etc. |
Repeatability**
Core Diameter < 0.1 µm
Cladding Diameter < 0.15 µm
Core Non-Circularity < 0.5%
Cladding Non-Circularity < 0.1%
Core-To-Cladding Concentricity < 0.15 µm
*May be fitted with other customised wavelengths.
**Repeatability is measured on the FGC-GS using a single 20/400 µm fiber without removing it from the unit at 22°C.
Part number | Description |
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FGC-GS | Fiber Glass Geometry System for measurement of optical fibers with diameters up to 800 µm. Including optical unit, fiber handling bench, cables, software package; desktop computer; pair of Arden holders suitable for 400 µm diameter coated fiber. |
Holders | |
FG-H-xxxx | Pair of Arden FGC fiber holders with xxxx µm V-groove, suitable for xxxx µm diameter coated fiber. Available holder sizes for FGC-GS are 80, 125, 200, 250, 400, 500, 600 and 800 µm. Customised diameters are available on request. |
Other Options | |
FGC-PMI-850 | PM illuminator, 850 nm, for measuring dimensions of 125 and 80 µm diameter PANDA fibers. Optional plug-in unit for all models of FGC. |
FGC-PMI-525 | PM illuminator, 525 nm, for measuring dimensions of 125 and 80 µm diameter PANDA fibers. Optional plug-in unit for all models of FGC. |