Longitudinal stripping of optical cables involves carefully removing the outer jacket or buffer along the cable's length using precision mechanical, thermal, or laser-based tools to avoid fiber damage.

Mechanical Stripping Techniques

Mechanical strippers are the most common tools for longitudinal stripping. They are designed to cut the outer jacket or buffer along the cable's axis without nicking the optical fibers inside. Key steps include:

• Tool Setup: Adjust the blade depth to match the cable diameter, ensuring the fiber is not damaged. For armored cables, tools like the ACS Armored Cable Slitter can slit both the polyethylene sheath and armor in one pass, following the cable's strength members to avoid spiraling or fiber damage .
• Cable Placement: Position the cable in the tool opening and secure it with adjustable rollers or thumb knobs to maintain a snug fit .
• Longitudinal Cut: Pull the tool along the cable length, allowing it to follow any external strength members. For multi-layer cables, strip each layer progressively—outer jacket, aramid yarn, and buffer—ensuring underlying layers remain intact .
• Blade Maintenance: Keep cutting edges sharp to achieve clean, straight cuts. Dull blades can create jagged edges or micro-nicks that compromise fiber integrity . Specialized buffer tube strippers, such as the 45-162 to 45-165 series, allow adjustable blade depth for different buffer diameters and support both transverse and longitudinal cuts, making them suitable for indoor loose tube and micro coaxial cables .

Thermal and Chemical Methods

Thermal strippers use controlled heat to soften polymer coatings, allowing them to be slid off the fiber. This method is particularly useful for tight-buffered fibers where mechanical stripping may risk nicking the glass. Chemical stripping involves solvents that dissolve the coating but is less common due to handling hazards and longer processing times .

Laser-Based Stripping

Laser stripping is a non-contact method that uses a focused laser beam to create an axially oriented groove along the protective cover. The groove allows the outer jacket to be split and removed without touching the fiber, minimizing the risk of micro-cracks or attenuation issues. This method is especially effective for tight-buffered or harnessed cables where precision is critical .

Best Practices

• Progressive Layer Stripping: Always remove layers individually, starting from the outer jacket to the buffer, to prevent damage to inner fibers .
• Avoid Fiber Contact: Ensure blades or heat sources do not touch the glass fiber directly, as even minor scratches can lead to cracks and signal loss .
• Consistent Technique: Use automated or semi-automated tools when possible for repeatable, uniform stripping, reducing operator error .
• Inspection: After stripping, inspect fibers for nicks, scratches, or uneven cuts before splicing or connectorization. By selecting the appropriate tool and following these techniques, longitudinal stripping can be performed efficiently while maintaining the integrity and performance of optical fibers.