VFI-200 Interferometer

The VFI is the interferometer of choice for industry leading photonics companies around the world. The VFI-200 is an interferometric inspection system specifically designed for checking the surface quality and flatness of your cleaved or polished fibers. The VFI offers the perfect combination of a superb image quality with ease of use, and the reliability and robustness that our customers have come to expect from Arden products, resulting in fiber end face measurements that you can trust.

With the VFI, the user can view their fibers in a range of different views, both in 2D and 3D, allowing the user to get a full understanding of their cleaving or polishing process. It has therefore proven itself to be very well suited to Research, Production, or QA environments.

2D Mode

Over the years, the VFI has become well-established in the fiber industry due to its clean, sharp 2D images of the fiber. The 2D mode of operation allows for a real-time analysis of the fiber end face. Two different views are available in 2D mode:

  • Inspect view - provides a high quality image of the fiber for easy detection of damage or contamination to the fiber (cleave point impact, hackle, dust)
  • Fringe view - high contrast and well-defined interference fringes allow the user to perform either a manual or fully automated analysis of the end face, to measure features such as the cleave angle and the amount of damage to the edge of the fiber
3D Mode

Users of the VFI are also able to create a 3D reconstruction of the fiber end face in just a matter of seconds at the click of a button. In 3D mode, two additional views are available:

  • 3D Map - a three-dimensional view of the fiber, allowing the user to immediately visually analyse the surface profile of the fiber end face
  • Height Map - a false colour map of the end face, with customisable scale, very useful in showing the change in cleave angle across the face of the fiber
Take control of your cleaving...

The VFI is used by customers around the world for a variety of applications in a wide range of industries, such as assessing cleave quality prior to high-strength splicing, cleaver maintenance, and production checks during the manufacture of critical optical assemblies such as fiber lasers.


Due to its user-friendly interface and ease of focusing, fully automated analysis of fiber end faces can be achieved in a matter of seconds, with minimal operator training needed.

Flexible software

The VFI comes with an efficient software package, providing the ability to analyse either a real-time 2D image of the fiber or a 3D reconstruction at the click of a button. Switching between Inspect view and Fringe view is also fully software controlled.

Users are able to grab and save images for later use, and previously stored images can be loaded for review. The report generator enables users to include up to 20 cleave images in one report along with comments. Users can also generate a .csv file giving height data for every pixel in the image. Other features include auto-optimisation of intensity, intensity line profile, edge damage estimation, angle orientation measurement, and measurement of radius of curvature.


Quality Images

The VFI-200 provides optimum image quality for the analsysi of fibers up to 200 µm cladding diameter, making it perfect for the analysis of telecoms and PM fibers.


The user can then further manipulate the image by zooming in further and rotating about the fiber in any direction, granting the user the power to focus on any specific areas of interest.

VFI 3D view
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Fiber Holders and Accessories
Classic-style Arden fiber holders

Arden Photonics classic-style fiber holders are well-established and have been the preferred holder for VFI users over the years.  Our holders are precision engineered using stainless steel, ensuring the highest levels of accuracy and repeatability. They hold the fiber in a well-aligned V-groove using a soft but secure magnetic clamp, providing repeatable and reproducible results.
The holders come in a variety of sizes to accommodate a wide range of fiber diameters, up to 2mm.

Dual-style Arden fiber holders

Arden Photonics dual-style holders offer the same high levels of accuracy and repeatability as our classic holders, but add extra flexibility to the user experience. The dual-style holders can be used with the Arden Photonics FGC Fiber Geometry Systems as well as the VFI. They can also be used in most Fujikura cleavers and splicers, allowing the user to cleave, inspect, analyse and splice without ever having to touch the fiber!

Adapter plates

We have a range of adapter plates available allowing our dual-style holders to be transferred to the VFI from a Fujikura cleaver, or from the VFI to a Fujikura splicer, without even having to touch the fiber.
Alternatively, the adapter plates allow standard Fujikura fiber holders to be used directly with the VFI. If you wish to use another type of holder then please contact us as we may be able to design an adapter plate to suit your needs.

Angled fiber holders

We also have angled fiber holders available, designed for use with fibers that have a large cleave angle. The angled holders hold the fiber at a specified angle in order to null the cleave angle so that an optimum platform is provided for analysing the features of the fiber end face.

Ferrule holders

We have a range of ferrule holders available to provide the user with the ability to analyse connectorised fibers and fibers in ferrules.
Most types of connector can be accommodated as we have ferrule holders for 1.25mm (LC), 2.5 mm (FC, SC, ST) and 3.2 mm  (SMA) ferrules, as well as Size 16 ferrules.

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.)

Latest Software
Technical Specification
Document Downloads
Ordering Information
VFI unit, no laptop

Images taken using the VFI Cleave Check Interferometer

These images are of a large diameter Polarisation Maintaining fiber taken using a VFI-1200.The images clearly show the cleave initiation point, the stress members and the cracking caused during cleaving because of the stress locked into the fiber. vf20imagelarge01 vf20imagelarge02
These images are of a 105/125 µm fiber, taken using a VFI-200. The cleave initiation point is clearly visible at the bottom of the image, and the interferogram indicates a significant end angle is present on the fiber. The cleave angle estimation feature in the VFI software showed this to be an angle of over 3 °. The inspect mode shows the core/cladding boundary.
These images are of a 125 µm diameter singlemode fiber cleaved using a Photon Kinetics FK-12 angled cleaver set at 8 °. The cleave was inspected using a VFI-200 with an VF-H8 8 ° fiber holder. The interferogram shows the cleave is very close to 8 ° but the end face has the saddle shape which is characteristic of a fiber cleaved using the “tension and torsion” method of angled cleaving.  vf20imagesmall06  vf20imagesmall05
These images are of a 400 µm diameter fiber cleaved using an LDF cleaver. The cleave was inspected using a VFI-200 in the cleaver’s own 400 µm fiber holder.The two cleaves were made on two consecutive days at LASER World of Photonics in Munich, Germany in 2011, one of the industry’s busiest shows. The interferograms were also snapped live during the show which is testament to the stability of the VFI-1200.  vfiimagelarge08  vfiimagelarge07
These images are of a 170 µm diameter multi-core fiber. The core pitches are 48 µm (left image) and 49 µm (right image). The images are reproduced courtesy of NICT (National Institute of Information and Communications Technology ), Tokyo, Japan and the University of Bristol, UK. The images are taken from the following paper : “First Fully-Elastic Multi-granular Network with Space/ Frequency/Time Switching Using Multi-core Fibres and Programmable Optical Nodes,” N. Amaya, M. Irfan, G. Zervas, R. Nejabati, D. Simeonidou, J. Sakaguchi, W. Klaus, B.J. Puttnam, T. Miyazawa, Y. Awa ji, N. Wada, I. Henning, 38th European Conference on Optical Communication (ECOC 2012), PostDeadline, Amsterdam, Netherlands, Sept. 2012.  vfiimagesnict02  vfiimagesnict01
These images are of 2 different MTP ferrule end faces. These images were taken in house on the VFI-1200-RS designed specially for imaging ribbon structures. The first picture shows the whole end polished with a slight angle on it with straight fringes covering the length of the ferrule. The second picture shows each individual fiber with a domed polish giving the characteristic circular fringe formation. The translation stage on the front of the VFI-1200-RS can be used to easily scroll along the fibers to check each individual fiber in a ribbon structure.
These images are of a 1mm fiber. The fibers were cleaved using a vytran large diameter cleaver and imaged using the VFI-2000. The 2000µm field of view allows the full 1mm surface to be viewed with a large amount of headroom 1000um inspection
The fiber shown in these images is a 2mm fiber, polished flat using a 3SAE FPS II polishing station. With a 2mm diameter fiber of this flatness, fringes can be resolved over the entire surface of the fiber. Images courtesy of Jose Cochon at Laser Technology SL taken using the VFI-2000.  2mm_100-50g_4step_RR_90min-30_fringe_slu  2mm_100-50g_4step_RR_90min-30_slu


Release v6.0 of VFI software is applicable to users of the VFI-200, the VFI-1200 and the VFI-2000. We strongly recommend all applicable users to upgrade. Please contact vfiupgrade@ardenphotonics.com to get a quotation.
Feature Benefit
3D Reconstruction of height data More intuitive visual analysis of the end-face, easier to perform cleave analysis
Save end face height data in csv file Store images of cleaves to give better traceability
3D representation of fiber end More detailed analysis of the fiber end - easier to pick up defects
Scalable user interface Easier to use software on a wide range of monitors
New image manipulation tools Zoom in and out and pan within live or saved images
Password protection Protect important system settings
Focus coefficient Numeric indication of best focus position to aid easy focus

Screen shots

VFI v6.0 3D reconstruction

VFI v6.0 3D representation of fiber end

VFI v6.0 in "Fringe" mode

Software Version Feature Guide

Software version number V 2.2 V 3.0 V 4.0 V 4.2 V 5.0 V 5.1 V 6.0
Release date 01/12/2011 29/01/2014 01/07/2015 06/01/2016 02/03/2018 07/06/2019 28/05/2021
User Manual Issue # 11 16 19 21 21 24
Intensity histogram
False colour display
Magnification calibration utility
End angle calculation
Camera exposure control/optimise
Report generator
Camera gain control
Camera gamma control
Auto detect fringe width
Cursor to change ROI
Easy switching between "Fringe" and "Inspect" mode
JPG image output format
Auto detect linear fringes using FT
Support Windows 8
Support 32-bit and 64-bit processors
Fine adjust of ROI using mouse
New keyboard shortcuts
Measure radius-of-curvature of polished fibers
Fully automated Fringe/Inspect mode switching
Improved auto-exposure
Full-screen image mode
Export reports to Microsoft Excel
Improved image measurement tools
User interface improvements
Windows 10 Support
On-screen scale bar
Up to 20 images per report
VFI-2000 Compatibiltiy
USB-3.0 camera support
Pass/Fail indicator
Calibration report
Angle orientation measurement
2 decimal point precision
3D end face reconstruction
Save height data in .csv file
View fiber end in 3D
Scable user interface
New image manipulation tools
Password protection for system settings
Focus coefficient
Field of View 200 µm maximum withx1.5, x2, x3 and x6 digital zoom
Image sensor 1/1.8 inch CMOS array, 12-bit, 6.4 MP
Camera sensor size 3088 x 2076 px, 2.4 µm square pixels
LED wavelength 525 nm
Measurement Capabilities
Maximum measurable cleave angle (without using angled fiber holder)* 2D mode: 8°
3D mode: 4°
Measurement time 2D mode: real-time
3D mode: < 7 s
Image Quality Fully resolves USAF Target to Level 7 minimum
Height Resolution 0.01 µm
Dimensions 240(W) x 240(D) x 90(H) mm
Weight 3 kg
Connection to computer USB 3.0 (USB Type B to USB A; 1 m cable supplied)
Power supply Via USB
Operating systems support Windows 7/8/10 64bit
Computer requirements 4 GB RAM; USB 3.0 port; 64bit
Operating temperature 10 – 30°C

* Maximum angle is stated for a fiber with 125 µm cladding diameter. Larger cleave angle can be measured using an angled fiber holder.

Part number Description
VFI-200 Interferometric inspection system for fibers with diameters up to 200 µm. Includes VFI-200 optical unit; fiber holder for 125 µm fibers; PC software; USB cable. Computer not included.
Fiber Holders
VF-H0-xxx Arden fiber holder for xxx µm fiber, perpendicular cleave
VF-H0-xxx-D Dual-style Arden VFI fiber holder for xxxµm fiber, perpendicular cleave (requires adapter plate)
VF-H8-xxx Arden fiber holder for xxx µm fiber, 8 degree cleave
VF-Annulus 9-sided annulus used with fiber holder in order to present the fiber to the VFI at a range of integer angles (from 4 to 12 degrees)
Please note: for VFI-200 standard holder sizes include 125, 200 and 250 with custom diameters available with extra charge.
Connector Holders
VF-F125 VFI holder for connector with 1.25 mm ferrule
VF-F250 VFI holder for connector with 2.50 mm ferrule
VF-F16 VFI holder for connector with # 16 style ferrule
VF-F320 VFI holder for connector with 3.2 mm ferrule (SMA)
Adapter Plates
VF-AP-3 Adapter plate for use with dual-style Arden holders and Fujikura holders. For use with fiber protrusion of 3mm from end of holder
VF-AP-12.5 Adapter plate for use with dual-style Arden holders and Fujikura holders. For use with fiber protrusion of 12.5mm from end of holder for direct use with FGC system or Fujikura cleavers and splicers (not suitable for fibers under 200µm in diameter)
VF-AP-C Front-clamped adapter plate for use with dual-style Arden holders and Fujikura holders. For use with fiber protrusion of 12.5mm from end of holder for direct use with FGC system or Fujikura cleavers and splicers. Designed for use with 125µm fiber only.
Other options
VFI-CC-01 Rigid carrying case for VFI
VFI-UEW2 VFI extended warranty covering parts and labour for 2 years from purchase, return to base. Cover excludes camera.
VFI-UEW3 VFI extended warranty covering parts and labour for 3 years from purchase, return to base. Cover excludes camera.
VFI-UEW4 VFI extended warranty covering parts and labour for 4 years from purchase, return to base. Cover excludes camera.
VFI-UEW5 VFI extended warranty covering parts and labour for 5 years from purchase, return to base. Cover excludes camera.