Professional Fiber Optic Splicing & OTDR Certification for Southern California
Fiber optic splicing is the most reliable way to join fiber — permanent, low-loss, and built to last the life of the cable. WCC Technologies Group performs in-house fusion splicing and OTDR certification testing for new installations, fiber repairs, extensions, and network upgrades across Southern California. Every fiber optic splicing job includes bidirectional OTDR testing and full trace documentation.
Fiber Optic Splicing for New Installs, Repairs & Extensions
Fiber optic splicing is the process of permanently joining two fiber ends — and when done correctly, the splice becomes the strongest, lowest-loss point in the entire run. When done incorrectly, a bad splice degrades an entire span and can be nearly impossible to locate without proper testing equipment.
WCC Technologies Group performs fusion splicing as part of new fiber optic installations, emergency fiber repairs, network extensions, and infrastructure upgrades across Southern California. We own our fiber optic splicing equipment and perform all splicing in-house — no subcontracting the most critical part of the job to a third party on a different schedule.
Every fiber optic splicing job we complete is verified with an OTDR trace. Every connector end-face is inspected with a fiber microscope before testing. You receive the full test documentation — not just a pass/fail sheet.
Need a full fiber installation, not just splicing? WCC handles complete fiber optic projects from RCDD design through OTDR certification. See our Fiber Optic Installation Services page for the full scope.
- Fusion splicing — singlemode OS2 and multimode OM3/OM4/OM5
- Emergency fiber repair and restoration
- Fiber extension and mid-span splicing
- Splice tray and enclosure installation
- Underground splice vault work
- End-face inspection on all connectors — fiber microscope
- OTDR testing — bidirectional, every span
- Optical loss testing (OPM/OLTS) per TIA-526
- Full OTDR trace report and splice loss documentation
- As-built splice schedule delivery at project close
How Fiber Optic Splicing Works — Step by Step
Fiber optic splicing is a precision process — every step matters. A single contaminated cleave or misaligned fiber core produces a splice loss that shows up in OTDR testing and degrades network performance. Here's how a proper fusion splice is made.
Strip & Clean
The fiber's protective coating is stripped back to expose bare glass. The exposed fiber is cleaned with IPA to remove any residue or contamination before the next step.
Precision Cleave
A calibrated fiber cleaver makes a flat, perpendicular cut across the fiber end. Cleave angle is critical — an imperfect cleave produces a higher-loss fiber optic splice regardless of splicer alignment.
Core Alignment
The fusion splicer uses a camera system to align the two fiber cores with sub-micron precision. The splicer estimates the expected fiber optic splicing loss before the arc fires.
Electric Arc Fusion
An electric arc melts the two fiber ends together, fusing them into a single continuous glass strand. Properly executed, the splice point has no air gap and insertion loss under 0.1 dB.
Protection & Tray
A heat-shrink splice protector is applied over the fusion point, then the protected splice is seated in a splice tray inside the enclosure — organized, labeled, and protected from movement.
OTDR Verification
The completed span is tested bidirectionally with an OTDR. The fiber optic splice appears on the trace with its exact location and measured insertion loss — confirming it meets TIA specifications.
Fusion vs. mechanical splicing: Mechanical splices use an index-matching gel to align fiber ends in a mechanical holder — faster to deploy but with higher typical insertion loss (0.3–0.5 dB vs. under 0.1 dB for fusion) and no permanent bond. WCC uses fusion splicing for all permanent fiber optic splicing work. Mechanical splicing is only appropriate for temporary emergency repairs where a fusion splicer is unavailable on-site.
OTDR Testing & Fiber Optic Splicing Certification
An OTDR — Optical Time Domain Reflectometer — is the definitive instrument for fiber optic certification. It sends a series of light pulses down the fiber and measures the backscattered and reflected light returning over time. The result is a trace: a visual map of the entire fiber span showing every fiber optic splice, connector, bend, and anomaly — with the distance and insertion loss at each event measured to within a meter over kilometers of fiber.
OTDR testing catches what a simple continuity test cannot: a high-loss fiber optic splice buried 800 meters into a campus run, a tight bend radius causing elevated attenuation, a connector end-face contamination that passes a quick power meter check but degrades over time.
WCC tests every fiber span bidirectionally — launching from both ends — because some anomalies only appear clearly in one direction. You receive the full bidirectional OTDR traces for every span as part of project documentation. Not a summary. Not a pass/fail sheet. The actual traces, labeled by span, with measured fiber optic splice losses at every event.
Accepting a fiber installation without OTDR documentation is accepting infrastructure of unknown quality. If a contractor can't produce OTDR traces, the spans weren't tested. Ask for the traces before sign-off on any fiber optic splicing project.
What OTDR Testing Measures
Also Performed
When Fiber Optic Splicing Is Required
Fiber optic splicing isn't only for new construction. These are the most common scenarios where WCC performs fusion splicing and OTDR testing for Southern California organizations.
New Fiber Installation
All backbone and campus fiber installations require fiber optic splicing to join cable reels, terminate at patch panels, and connect into splice enclosures. This is the core of every fiber installation project WCC delivers.
Emergency Fiber Repair
A severed or damaged fiber cable requires emergency fiber optic splicing to restore connectivity. WCC responds to fiber emergencies across Southern California with in-house equipment and crews — no waiting on subcontractor availability.
Network Extension
Expanding a campus network to a new building or adding an IDF in a facility expansion requires mid-span or end-point fiber optic splicing to integrate into the existing fiber plant.
Performance Troubleshooting
Unexplained network performance issues or elevated error rates on a fiber span can indicate a degraded fiber optic splice, damaged connector, or cable bend issue. OTDR testing pinpoints the exact fault location and loss level — no guesswork.
Certification of Existing Infrastructure
Inherited fiber infrastructure with no test documentation? WCC performs certification testing on existing fiber plants — documenting current performance and identifying any spans that require fiber optic splicing remediation.
Infrastructure Upgrade Projects
Upgrading from 1G to 10G switching or reconfiguring an existing fiber backbone often requires re-splicing or new enclosure builds — with OTDR verification on all modified spans before the upgraded network goes live.
Fusion Splicing vs. Mechanical Splicing vs. Connectorization
There are three ways to join or terminate a fiber — and each has its place. Understanding the tradeoffs helps you evaluate which fiber optic splicing approach is right for your project.
| Method | Typical Loss | Durability | Best Application |
|---|---|---|---|
| Fusion Splicing | <0.1 dB | Permanent — life of cable | All backbone and campus runs; any permanent fiber optic splicing installation |
| Mechanical Splicing | 0.3–0.5 dB | Temporary — susceptible to movement | Emergency temporary repair only; not appropriate for permanent infrastructure |
| Field Connectorization | 0.3–0.75 dB | Permanent — connector-grade | Patch panel terminations, shorter runs, variable-length terminations |
| Pre-Terminated Assembly | <0.5 dB (factory tested) | Permanent — factory certified | High-density data center and IDF deployments; MTP/MPO trunk systems |
Our Fiber Optic Splicing & Testing Process
Whether it's a scheduled installation splice or an emergency repair, our fiber optic splicing process is the same — precision execution, full verification, documented results.
Scope Assessment
We review the fiber type, cable construction, span distances, and enclosure requirements — or for emergency repairs, assess the damage and determine the fiber optic splicing restoration approach before mobilizing equipment.
Enclosure Prep
Splice enclosure or closure is prepared, cable entries sealed, and fiber slack managed. Proper slack storage inside the enclosure is essential for future re-splicing if a span ever needs repair.
Fusion Splicing
Each fiber is stripped, cleaned, cleaved, and fusion-spliced with core alignment verified by the splicer's camera system. Splice protectors are applied and fiber optic splices organized into labeled tray positions.
End-Face Inspection
All connector end-faces are inspected with a fiber microscope. Contaminated end-faces are cleaned and re-inspected before any OTDR or optical loss testing begins.
OTDR Certification
Every span is tested bidirectionally. The OTDR trace shows each fiber optic splice with its measured loss, confirms span length, and verifies total insertion loss meets TIA specification for the fiber type and distance.
Documentation Delivery
Full OTDR traces for every span, fiber optic splice loss records, end-face inspection images, and an as-built splice schedule — delivered digitally at project close or upon emergency repair completion.
Why Organizations Choose WCC for Fiber Optic Splicing
A fusion splice is only as good as the technician, the equipment, and the verification process behind it. Here's what differentiates WCC's fiber optic splicing work across Southern California.
In-House Equipment, Every Job
We own our fusion splicing and OTDR equipment. It goes on every fiber optic splicing job — no subcontracting, no waiting for a third party. When you need emergency splicing, we can mobilize our own crew and equipment.
End-Face Inspection Standard
Every connector end-face is inspected with a fiber microscope before testing on every fiber optic splicing job — not after a failure is found. Contaminated end-faces are the single most common cause of fiber performance problems.
Bidirectional OTDR on Every Span
We test every span from both ends. Some anomalies are only clearly visible in one test direction. Bidirectional OTDR is the standard for every fiber optic splicing project — anything less leaves your infrastructure partially characterized.
Full Trace Documentation
You receive the OTDR traces, not a summary. That documentation is your evidence of fiber optic splicing quality, your baseline for future troubleshooting, and your protection if performance issues arise months or years later.
BICSI RCDD on Staff
For fiber optic splicing work that's part of a larger fiber installation or network infrastructure project, our on-staff BICSI RCDD ensures the splicing approach is designed correctly — not improvised in the field.
Emergency Response Available
Fiber cuts don't happen on a schedule. WCC provides emergency fiber optic splicing response for Southern California facilities — with in-house equipment and crews that don't depend on subcontractor availability.
Fiber Optic Splicing Technology Partners
WCC splices and certifies fiber from leading manufacturers. Our fiber optic splicing and testing equipment is calibrated and maintained for the precision that fusion splicing and OTDR certification require. Corning optical fiber and CommScope are our primary cable partners.
Fiber Optic Splicing — Southern California Service Area
WCC Technologies Group provides fiber optic splicing and OTDR certification across Southern California. Our crews deploy from our headquarters in Chino, CA — no travel fees within our primary six-county service area. Emergency fiber repair response available across all six counties.
Los Angeles County
- Los Angeles
- Long Beach
- Pasadena
- Burbank & Glendale
- El Segundo
- Torrance
- San Fernando Valley
- & more
Orange County
- Irvine
- Anaheim
- Santa Ana
- Newport Beach
- Huntington Beach
- Fullerton
- Costa Mesa
- & more
San Bernardino County
- Chino
- Ontario
- Rancho Cucamonga
- San Bernardino
- Fontana
- Redlands
- Upland
- & more
Riverside County
- Riverside
- Corona
- Moreno Valley
- Murrieta
- Temecula
- Palm Springs
- Perris
- & more
San Diego County
- San Diego
- Chula Vista
- Escondido
- Carlsbad
- El Cajon
- Oceanside
- Vista
- & more
Ventura County
- Ventura
- Oxnard
- Thousand Oaks
- Simi Valley
- Camarillo
- Moorpark
- Santa Paula
- & more
Fiber Optic Splicing — Frequently Asked Questions
What is the difference between fusion splicing and mechanical splicing?
Fusion fiber optic splicing uses an electric arc to permanently weld two fiber ends together, producing a joint with insertion loss typically under 0.1 dB that lasts the life of the cable. Mechanical splicing holds two fiber ends in alignment with an index-matching gel — faster to deploy but with higher typical insertion loss (0.3–0.5 dB), no permanent bond, and susceptibility to movement and vibration over time. WCC uses fusion splicing for all permanent fiber optic splicing installations. Mechanical splicing is only appropriate as a temporary emergency repair when a fusion splicer isn't available on-site.
How long does fiber optic splicing take?
An experienced fusion splicing technician can complete a single fiber optic splice in 2–5 minutes once the cable is prepared and the enclosure is set up. For a 12-fiber backbone cable, the actual splicing work typically takes 30–60 minutes. Total project time depends on cable prep, enclosure work, and the number of spans — a multi-building campus fiber optic splicing project with multiple enclosures may take one to several days. WCC provides project-specific timelines based on your scope.
Can you splice any type of fiber?
Yes. WCC performs fiber optic splicing on singlemode OS2 and all generations of multimode fiber — OM1, OM2, OM3, OM4, and OM5. Singlemode and multimode fiber cannot be spliced together, but within each category, different cable constructions — indoor, outdoor armored, gel-filled, ribbon — can all be fusion spliced with the appropriate preparation technique for the cable type.
What does an OTDR trace actually show?
An OTDR trace is a graph with distance along the horizontal axis and signal level on the vertical axis. A fiber optic splice appears as a small downward step — the measured height of that step is the splice insertion loss. A connector appears as a reflective spike followed by a step down. A fiber break appears as the trace ending abruptly. Every event shows its measured location and insertion loss to within about a meter.
Can WCC test and certify fiber installed by another contractor?
Yes. WCC performs OTDR certification testing on existing fiber infrastructure — whether it was installed by a previous contractor or simply never properly tested. We provide a full test report documenting current performance on every span, identify spans with excessive loss, and can perform fiber optic splicing remediation on spans that don't meet TIA standards.
Do you provide fiber optic splicing in Los Angeles?
Yes. WCC Technologies Group provides fiber optic splicing across Los Angeles County — serving enterprise campuses, healthcare facilities, school districts, government facilities, and data centers in Los Angeles, Long Beach, Pasadena, Burbank, El Segundo, Torrance, and the San Fernando Valley. Emergency fiber repair response is available throughout LA County.
Do you provide fiber optic splicing in San Diego?
Yes. WCC provides fiber optic splicing across San Diego County — serving businesses, campuses, and facilities in San Diego, Chula Vista, Escondido, Carlsbad, El Cajon, Oceanside, and Vista. Emergency fiber repair and OTDR certification services are available throughout San Diego County and the broader Southern California region.
Need Fiber Optic Splicing or OTDR Testing?
Whether it's a new installation, an emergency repair, or certification testing on existing Southern California infrastructure — tell us what you're working with and we'll tell you exactly what it takes to do it right.