Professional fibre optic testing and certification
Fibre optic testing and certification provide documented proof that a fibre link performs to specification. Whether you are commissioning a new fibre optic installation, diagnosing a fault, or evidencing compliance for an audit or handover, certified test results are the difference between assuming a network works and proving it does.
As members of the Fibre Optic Industry Association, ACCL’s engineers test with calibrated equipment and issue full certification reports covering insertion loss, reflectance, and length for every link, giving you a complete, auditable record of network performance.
Our fibre optic testing services
We test to recognised standards and report every result. Our testing covers new installations, fault finding, and periodic verification of existing infrastructure.
OTDR testing
Optical Time-Domain Reflectometer testing that maps the entire fibre run, pinpointing splices, connectors, bends, and faults by distance. Carried out bi-directionally and at every relevant wavelength for an accurate, complete trace.
Insertion loss (OLTS) testing
Optical Loss Test Set measurement of end-to-end attenuation against the link loss budget, confirming each link meets its required performance threshold.
Fault diagnosis & location
Rapid identification and precise location of breaks, high-loss joints, and degradation, feeding directly into our fibre optic repair service.
Certification & reporting
Full documented certification per link, ready for warranty, compliance, and project handover. Results delivered in a clear, auditable format.
Pre- and post-installation testing
Verification before, during, and after installation so issues are caught early and the finished network is signed off with confidence.
Annual & periodic verification
Scheduled re-testing of critical links to detect degradation before it causes downtime, with equipment kept on a regular calibration cycle.
Why certified testing matters
Uncertified fibre is a liability. Without documented test results you cannot prove a link meets standard, support a warranty claim, or satisfy an auditor, and intermittent faults can go undetected until they cause an outage. Certified testing gives you measured evidence of performance, a baseline to compare against in future, and the documentation required for compliance. It is the final, essential step that turns a fibre installation into a verified asset.
Trusted on critical infrastructure
Our engineers have delivered fibre testing and certification across demanding commercial and financial environments, including major banking, exchange, and transport infrastructure where accuracy and documentation are non-negotiable. The same rigour applies to every project, from a single link to a full campus, and pairs naturally with our fibre splicing and termination work.
Get in touch today
Have a no-obligation chat with one of our data cabling experts, who can recommend a solution to suit your requirements and budget.
Featured case studies
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Delivering Fibre Optic Connectivity for the Thames Tideway Tunnel
The Thames Tideway Tunnel, also called London’s Super Sewer, is the largest infrastructure project ever undertaken to improve the health of the River Thames and modernise the capital’s Victorian-era sewer system. The 25 km tunnel, stretching from Acton in west…
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Luton Hoo Hotel
Luton Hoo Hotel, Golf and Spa, a Grade 5 star hotel on the border of Hertfordshire and Bedfordshire is itself undergoing treatment…the ACCL Treatment!
What our clients think
As the client I can only say thanks and its an amazing piece of work by all involved. Believe me that the work to coordinate this work around other issues was challenging but Wayne and ACCL were great.
TUI / Scott Ronan
We would like to take this opportunity to thank, You, Wayne and the team for such an excellent and professional implementation.
The organisation was fantastic and the way you worked within the building was great 😊 the business users did not even know what was going on in the building 😊 We would definitely not hesitate to use you guys again.
Wise Music Group
Need your fibre tested and certified?
Whether you are signing off a new installation or diagnosing a fault, our FIA-certified engineers provide accurate testing and full certification. Contact us to arrange an attendance.
Frequently Asked Questions – (FAQs)
What is OTDR testing?
OTDR (Optical Time-Domain Reflectometer) testing sends light along the fibre and measures the reflections to map the whole run, locating splices, connectors, bends, and faults by distance. We test bi-directionally and at every relevant wavelength for an accurate, complete trace.
What is the difference between OTDR and insertion-loss testing?
OTDR maps events along the fibre and locates faults; insertion-loss (OLTS) testing measures total end-to-end attenuation against the link loss budget. A full certification uses both.
Do you provide a certification report?
Yes. We issue documented certification per link covering insertion loss, reflectance, and length, in a clear, auditable format suitable for warranty, compliance, and handover.
Why do I need my fibre certified?
Certification proves each link meets standard, supports warranty and compliance, provides a performance baseline, and catches faults before they cause downtime.
Can you test an existing fibre network?
Yes — we carry out periodic and annual verification of existing links to detect degradation early, as well as testing new installations.
Is your test equipment calibrated?
Yes. Our test equipment is kept on a regular calibration cycle, so results are accurate and defensible.