FGC-GS Fiber Geometry System

The FGC-GS fiber geometry measurement system uses the video grey scale technique (RTM method) to provide fast, automated core/cladding geometry measurements.

Darkfield Illumination

The Arden Photonics darkfield illumination system allows the software to show a clear live image of the end face of the fiber by illuminating the end face of the fiber and imaging the reflected light. This allows users to inspect the end face of the fiber whilst taking geometry measurements. The darkfield method of fiber geometry measurement is supported by both NPL in the UK and NIST in the USA.

Efficient Software

The FGC comes with an efficient software package containing controls to switch between reflection and transmission mode. This 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, however users can also create their own. This allows the measurement of many special fiber types including dual clad fiber, bend insensitive fiber, multicore fibers and many more.

Latest software release – version 3.0 – Click here for more details
After sales services

Contact Arden Photonics for information on our comprehensive packages (extended warranties, calibration programs, software upgrades, etc.) and per-incident services (repair, calibration, etc.)

Technical Specification
Document Downloads
Ordering Information
FGC software screenshot v3.5
FGC transmission software screenshot v3.5
  • Measures up to 1000µm nominal cladding diameter
  • Can measure special fiber e.g. Dual clad fiber, octagonal, etc.
  • Darkfield illumination gives clear view of the fiber endface
  • Standards compliant - have confidence in its accuracy
  • Compact, robust and reliable - means its ready for production
  • Consistent, repeatable fiber geometry measurements in seconds
  • Traceable calibration
  • Fiber handling including Arden and Fujikura holders
  • Internal LED array for consistent and fully filled core launch conditions

    Repeatability core diameter (MM)

    < 0.1µm

    Repeatability cladding diameter (MM)

    < 0.25µm

    Repeatability core non-circularity (MM)

    < 0.05%

    Repeatability cladding non-circularity (MM)

    < 0.1%

    Repeatability core-to-cladding concentricity (MM)

    < 0.15µm

    Measurement time

    < 1 minute (including fiber preparation)


    11kg (with carry case 33kg)


    500w x 500d x 200h (cm)

    Computer Requirements

    All FGC systems are supplied with a desktop computer running up-to-date Windows operating system.

Part number Description
FGC-GS FGC-GS Fiber Glass Geometry System for measurement of optical fibers with diameters up to 1000µm. Including optical unit, fiber handling bench, cables, software package; desktop computer; pair of Arden holders suitable for 400µm diameter coated fiber.
FG-H-250 Pair of Arden FGC fiber holders with 250µm V-groove, suitable for 250µm diameter coated fiber
FG-H-400 Pair of Arden FGC fiber holders with 400µm V-groove, suitable for 400µm diameter coated fiber
FG-H-600 Pair of Arden FGC fiber holders with 600µm V-groove, suitable for 600µm diameter coated fiber
FG-H-800 Pair of Arden FGC fiber holders with 800µm V-groove, suitable for 800µm diameter coated fiber
FG-H-1000 Pair of Arden FGC fiber holders with 1000µm V-groove, suitable for 1000µm diameter coated fiber
FG-H-CUST Pair of Arden FGC fiber holders with customer defined V-groove diameter