Fiber Geometry System FGC-GH
A glass geometry measurement system for specialty fibers with cladding diameters from 80 um to 250 um, aimed at hollow core, multi-core and polarisation-maintaining fiber.
Technical overview
The FGC-GH images a prepared fiber end face under darkfield and transmitted illumination at 525 nm and derives core and cladding diameters, non-circularity and core-to-cladding concentricity. An ultra-high numerical aperture optical system and high-magnification objectives resolve the nested tube structures of NANF and DNANF hollow core fiber, and a software plug-in architecture supplies fiber-type-specific routines so results are automatic and user-independent. Measurement takes under 25 seconds in standard mode or under 150 seconds in enhanced performance mode, excluding fiber preparation. It also supports multi-core fiber core location and concentricity work, and high-precision characterisation of standard singlemode fiber.
Features
- Optimised for characterising specialty fibers from 80 um to 250 um (smaller cladding diameter available on request)
- Optimised for the Latest Optical Fibers: built-in ultra-high numerical aperture optical system for HCF and DNANF
- Fast Validation of Manufactured Fibers: high-precision measurement of each double-nested set of tubes within the DNANF structure
- R&D and Production Compatibility: software plugins tailored to each specific fiber type, plus an extensive set of manual tools
- Software plug-in architecture for dedicated measurement capabilities by fiber type
Specifications
| Parameter | Value |
|---|---|
| Field of view | ~330 um |
| Fiber illumination - reflection | Darkfield illumination, 525 nm LED |
| Fiber illumination - transmission | High NA LED source, 525 nm |
| Core diameter / hollow core diameter repeatability (1 sigma), singlemode | <0.03 um |
| Core diameter / hollow core diameter repeatability (1 sigma), multimode | <0.04 um |
| Core diameter / hollow core diameter repeatability (1 sigma), NANF plug-in | <0.04 um |
| Cladding diameter repeatability (1 sigma), singlemode | <0.02 um |
| Cladding diameter repeatability (1 sigma), multimode | <0.02 um |
| Cladding diameter repeatability (1 sigma), NANF plug-in | <0.02 um |
| Core non-circularity repeatability (1 sigma), singlemode | <0.5 % |
| Core non-circularity repeatability (1 sigma), multimode | <0.25 % |
| Core non-circularity repeatability (1 sigma), NANF plug-in | <0.5 % |
| Cladding non-circularity repeatability (1 sigma), singlemode | <0.02 % |
| Cladding non-circularity repeatability (1 sigma), multimode | <0.02 % |
| Cladding non-circularity repeatability (1 sigma), NANF plug-in | <0.02 % |
| Core-to-cladding concentricity repeatability (1 sigma), singlemode | <0.03 um |
| Core-to-cladding concentricity repeatability (1 sigma), multimode | <0.02 um |
| Core-to-cladding concentricity repeatability (1 sigma), NANF plug-in | <0.03 um |
| Repeatability basis (singlemode/multimode columns) | Measured using a single 125 um fiber without removing it from the unit at 22 degC; applicable to OM1, OM2 and singlemode fibers only |
| Repeatability basis (NANF plug-in column) | Measured using a single 240 um fiber without removing it from the unit; measuring performance of other fibers is not guaranteed |
| Measurement time (standard) | <25 seconds (excluding fiber preparation) |
| Measurement time (enhanced performance) | <150 seconds (excluding fiber preparation) |
| Fiber diameter (cladding) | Single fibers up to 250 um |
| Specialty fibers | Dual clad, Non-circular, Octagonal, PM, Multicore, NANF / DNANF etc. |
| Weight | 9 kg (with carry case 33 kg) |
| Size of FGC unit | 0.3 x 0.45 x 0.15 m |
| Total footprint (incl. fiber handling bench) | 0.3 x 0.7 x 0.15 m |
| Operating temperature | 10 - 30 degC |
| Computer requirements | All FGC systems are supplied with a computer running up-to-date Windows OS |
| Data interface | 1 x USB 3.0 (USB B to USB A: 1 m cable supplied) |
Applications
- Hollow Core Fiber (HCF) geometry characterisation, including NANF and DNANF
- Multi-Core Fiber (MCF) core location and core-to-cladding concentricity
- Polarising-Maintaining Fiber (PMF) and other specialty fiber designs
- High precision characterisation of standard singlemode fibers
- Specialty fiber production quality control and R&D
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