Fiber Testing & Certification
OTDR testing, optical loss measurement, and end-to-end fiber certification that turns a completed build into acceptance-ready documentation — the proof your network performs the day it's turned up, and the baseline for troubleshooting years down the line.
A Fiber Build Isn't Done Until It's Proven
Fiber that looks correct on the splice tray can still fail a link budget. A cracked ferrule, a marginal fusion splice, or a macrobend hidden inside a coil of slack storage produces loss that's invisible to the eye but shows up as a link that won't pass acceptance, a service that drops under load, or a fault that takes hours to locate months later without a baseline trace to compare against.
CoreSync tests every segment with bi-directional OTDR and end-to-end optical loss measurement, comparing the results against the project's design budget rather than a generic pass/fail threshold. Anything marginal gets flagged and, where we've done the splicing ourselves, corrected before the closure is ever sealed. Where we're testing another crew's work, you get an independent, unbiased read on exactly where the plant stands.
Whether you need acceptance testing to close out a new build, fault location on a route that's misbehaving, or a due-diligence report on fiber you're acquiring, the deliverable is the same: trace files and a certification report that hold up to review, not a verbal "it tested fine."
What You Can Expect
- Bi-directional OTDR traces at project-specified wavelengths
- End-to-end insertion loss and optical return loss readings
- Continuity and polarity verification on every strand
- Results compared against your design loss budget
- Trace files and certification reports ready for acceptance
- Independent testing on fiber CoreSync did not install
Full-Spectrum Optical Testing
Bi-Directional OTDR Testing
Optical Time Domain Reflectometer traces run in both directions on every segment, resolving splice loss, connector loss, and event locations that a single-direction trace can mask or misreport.
Optical Power Loss Measurement
Light-source and power-meter (LSPM) insertion loss testing at 1310/1550 nm, confirming end-to-end attenuation is inside the design budget before a segment goes live.
End-to-End Insertion Loss
Full-link Tier 1 and Tier 2 testing per TIA-568 and carrier-specific acceptance criteria, covering every splice, connector, and passive component in the path.
Reflectance & Return Loss
Optical return loss and reflectance readings that flag marginal connectors and physical-contact issues before they surface as intermittent signal degradation in service.
Continuity & Polarity Verification
Fiber-map and polarity checks across every strand and connector type — LC, SC, MPO/MTP — catching transposed or dark fibers before turn-up, not after.
As-Built Documentation
Trace files, loss tables, and certification reports delivered in the format your acceptance process requires, mapped to your splice matrix and route drawings.
From Design Budget to Certified Segment
Review Design & Budget
We pull the route drawings, splice matrix, and design loss budget so every reading we take has a pass/fail threshold before the test set powers on.
OTDR Trace Both Directions
Bi-directional OTDR traces at the wavelengths specified for the build, identifying every splice, connector, and macrobend event along the route and its individual loss contribution.
Insertion Loss & Return Loss
LSPM end-to-end insertion loss and optical return loss measurements confirm the link performs as a whole, not just at each individual event.
Certify & Deliver
Results are compared against the design budget, out-of-spec segments are flagged for rework before sign-off, and you receive trace files and certification reports ready for acceptance review.
Testing for Every Stage of the Fiber Lifecycle
Testing isn't a one-time checkbox at project close-out — it's a baseline you can come back to. A documented trace file from turn-up becomes the reference point for diagnosing a fault two years later, or for proving a third party caused new damage to an existing route.
Building new fiber and need it spliced and certified in one pass? Pair testing with our fusion and mechanical splicing services for a single accountable crew from placement to certified sign-off.
Frequently Asked Questions
What is OTDR testing and why does it matter?
OTDR (Optical Time Domain Reflectometer) testing sends a light pulse down a fiber and measures the reflected signal to locate and quantify splice loss, connector loss, and physical events like bends or breaks along the route. Run bi-directionally, it's the standard method for verifying a fiber segment meets its design loss budget before it's certified for service.
Do you test single-direction or bi-directional OTDR?
Bi-directional, on every segment. A single-direction trace can under- or over-report splice loss depending on the fiber's backscatter characteristics in each direction; averaging both directions gives the accurate loss figure that carrier and TIA-568 acceptance standards require.
What documentation do I receive after testing?
Trace files, loss tables, and a certification report mapped to your splice matrix and route drawings, in the format your acceptance process requires — PDF summary reports, raw .sor trace files, or both, depending on what your network operator or general contractor specifies.
Can you test fiber that another crew installed or spliced?
Yes. We regularly perform independent acceptance testing and pre-purchase due diligence on fiber plant built or spliced by other contractors, including troubleshooting existing routes with unexplained loss or intermittent faults.
How does testing tie into your splicing work?
On CoreSync-spliced builds, every segment is OTDR-verified before the closure is sealed, so testing and splicing happen as one accountable process rather than a separate step performed later by someone unfamiliar with the build.
24/7 Emergency Fiber Restoration
Storm damage, cable cuts, live network failures — we respond fast.