FGC-GS Fiber Geometry System

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 – fiber glass geometry for fibers up to 1000 µm diameter.

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.

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.).

Fiber Gallery
Latest Software
Technical Specification
Latest Software
Document Downloads
Ordering Information
PM fiber Octagonal fiber Dual clad fiber
Micro-structured fiber Multimode fiber Multicore fiber
Release v5.0 of FGC software is applicable to the FGC-GT, GS and GA optical units.
Feature Benefit
MT Ferrule measurement Enables measurement of core positioning in MT ferrules using the FGC-GA
Capillary Measurement Enables measurement of small glass capillaries
Core-Inner Cladding Concentricity Enables measurement of Core-Inner Cladding Concentricity of double clad fibers

Screen shots

FGC v5.0 in "Reflection" mode

FGC v5.0 showing dual clad fiber

FGC v5.0 showing octagonal fiber

FGC v5.0 showing PM fiber

FGC v5.0 showing multi-fiber array

FGC v5.0 showing fiber templates

Software Version Feature Guide

Software version number V 2.0 V 3.0 v4.0 v4.5 v4.9 V5.0
Release date - March 2016 August 2017 March 2018 March 2020 June 2020
User Manual Issue #  2  3 6 6 6 7
Line Profile
False colour display
User Definable Fiber Spec Templates
12-bit data analysis
Password protection for config mode
Automatic exposure control
Support Windows 8
Support 32-bit and 64-bit processors
Customizable Excel format report
One click export of FGC data
Keyboard shortcuts
Auto-centre display
Pm Measurement
Polygonal Measurement
multicore measurement
 Standard deviation displayed
Support Windows 10
HD edition
Fibre Array measurement
Scanning stage support
High resolution camera support
Bright field focus for connector
Imaging tools
Saturated Image Mode
CCC Angle
Dual-wavelength support
PM Illuminator support
MT Ferrule measurement
Capillary Measurement
Core-Inner Cladding Concentricity
Optical FGC-GS
Max Field of View 1200 µm
Fiber Illumination – Reflection* Darkfield illumination, 850nm LED
Fiber Illumination – Transmission* Multiple LED array, 850nm
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
Measurement Capability
Measurement Time < 10 seconds (excluding fiber prep)
Fiber Diameter up to 1000 µm
Special Fibers Dual clad, Octagonal, PM,
Multicore, PCF, etc.
Weight 11kg (with carry case 33kg )
Size 0.5 x 0.5 x 0.2
Operating Temp 10 – 30° C
Computer Requirements All FGC systems are supplied with a computer running
up-to-date Windows operating system.
Data Interface 1 X USB 3.0 (USB B to USB A: 1 m cable supplied)


*May be fitted with other customized 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
FGC-GS Fiber Glass Geometry System for measurement of optical fibers with diameters up to 1000 µm. Including optical unit, fiber handling bench, cables, software package; desktop computer; pair of Arden holders suitable for 400 µm diameter coated fiber.
FG-H-250 Pair of Arden FGC fiber holders with 250 µm V-groove, suitable for 250 µm diameter coated fiber
FG-H-400 Pair of Arden FGC fiber holders with 400 µm V-groove, suitable for 400 µm diameter coated fiber
FG-H-600 Pair of Arden FGC fiber holders with 600 µm V-groove, suitable for 600 µm diameter coated fiber
FG-H-800 Pair of Arden FGC fiber holders with 800 µm V-groove, suitable for 800 µm diameter coated fiber
FG-H-1000 Pair of Arden FGC fiber holders with 1000 µm V-groove, suitable for 1000 µm diameter coated fiber
FGC-GUEW3 FGC-Glass geometry system, extended warranty covering parts and labour for 3 years from purchase, return to base. Cover excludes camera.
FGC-GUEW5 FGC-Glass geometry system, extended warranty covering parts and labour for 5 years from purchase, return to base. Cover excludes camera.
FGC-PMI PM illuminator designed for use with the FGC