Blog | mechanical splice
The act of joining two individual lengths of optical fiber to create a secure connection is called splicing. There are currently two
What is the mechanical method for optical cable splicing
Mechanical splicing joins two optical fibers using a precision alignment device and index-matching material, providing a quick, practical, and cost-effective solution for field or temporary connections.
Overview of Mechanical Splicing
Mechanical splicing is a method of joining two optical fibers without fusing them permanently. Instead, the fibers are aligned and held in place using a mechanical fixture, often with a transparent gel or optical adhesive that matches the refractive index of the fiber glass to minimize signal loss and back reflection . This method is particularly useful for temporary repairs, field installations, or multimode fiber splicing where speed and simplicity are prioritized over the lowest possible loss .
Components and Tools
A typical mechanical splice assembly includes:
- Alignment fixture: Precisely holds the fiber ends in place.
- Index-matching gel or adhesive: Reduces Fresnel reflections and insertion loss.
- Protection sleeve: Encases the splice to provide mechanical stability.
- Cleaver: Ensures clean, perpendicular fiber ends.
- Optional visual fault locator (VFL): Helps optimize alignment and verify light transmission . Unlike fusion splicing, mechanical splicing does not require expensive fusion splicers, making it more accessible for field technicians and temporary setups .
Procedure
- Prepare the fibers: Strip the protective coating and clean the fiber ends.
- Cleave the fibers: Use a precision cleaver to create flat, perpendicular ends.
- Insert fibers into the splice unit: Align the fibers in the mechanical fixture.
- Apply index-matching gel: Fill the gap between fibers to reduce reflection and loss.
- Secure the splice: Lock the fibers in place and cover with a protective sleeve.
- Test the splice: Use an OTDR or light source to verify insertion loss and alignment .
Performance and Applications
- Insertion loss: Typically around 0.3 dB, higher than fusion splicing (~0.1 dB) but acceptable for many short-haul or temporary applications .
- Reflectance: Slightly higher than fusion splices due to the physical interface.
- Mechanical strength: Lower than fusion splices; fibers are crimped rather than fused, so pull-out strength is limited .
- Applications: Quick field repairs, temporary connections, multimode fiber installations, testing bare fibers, or connecting pre-polished connectors .
Advantages
- Cost-effective: Requires minimal equipment compared to fusion splicing.
- Fast and convenient: Ideal for emergency repairs or temporary setups.
- Reversible: Some mechanical splices can be disconnected if needed.
- Versatile: Works for both singlemode and multimode fibers .
Limitations
- Higher loss and reflectance compared to fusion splicing.
- Lower mechanical strength, making it less suitable for long-term or high-stress environments.
- More expensive splice components than simple fusion protection sleeves . Mechanical splicing remains a practical solution for field technicians and temporary installations, offering a balance between speed, cost, and acceptable optical performance. It is widely used in premises networks, emergency repairs, and situations where fusion splicing is impractical.
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