Methods for stripping multimode steel wire optical cables

Stripping multimode optical cables requires careful, layer-by-layer removal of the jacket, aramid yarn, buffer, and coating using mechanical, thermal, or chemical methods to avoid fiber damage.

Layer-by-Layer Stripping Approach

Multimode optical cables typically have multiple protective layers: an outer jacket, aramid yarn for tensile strength, a buffer, and the fiber coating. Each layer must be stripped progressively, not all at once, to prevent damage to the underlying fiber or buffer layers. Start by removing the outer jacket using a wire or sheath cutter sized for the cable diameter, then carefully cut and remove the aramid yarn, followed by the buffer coating, and finally the fiber coating itself, exposing the bare glass for connectorization or splicing .

Mechanical Stripping

Mechanical strippers are the most common tools for multimode fibers. They use precision blades to remove coatings without nicking the glass. Handheld strippers are available for standard fiber diameters (typically 125 µm cladding with 250 µm coating) and can also handle tight buffers (600–900 µm) and larger cable jackets. Tools often include fiber guides and color-coded blades to match specific fiber diameters, ensuring consistent stripping lengths . For steel-reinforced cables, ensure the stripper is rated for tougher outer jackets.

Thermal Stripping

Thermal strippers use controlled heat to soften or burn off polymer coatings. This method is useful for fibers with thick or hardened coatings, as it reduces the risk of mechanical stress on the glass. Thermal stripping is precise and can be used for both end stripping and “window strip” operations, where a short section of coating is removed from the middle of the fiber .

Chemical Stripping

Chemical methods involve solvents that dissolve polymer coatings. This is less common in field applications due to handling hazards but can be effective for specialty coatings like polyimide. After chemical stripping, fibers must be thoroughly cleaned with lint-free wipes and high-purity alcohol to remove residues .

Best Practices

• Progressive stripping: Remove layers one at a time to avoid damaging the fiber or buffer .
• Proper tool maintenance: Keep blades sharp and clean to ensure clean cuts and prevent microfractures .
• Controlled strip length: Typically 30–40 mm for connectorization; avoid stripping more than 50 mm at a time .
• Fiber cleaning: After stripping, clean the bare fiber with lint-free wipes and high-purity alcohol to remove residues .
• Secure handling: Use a fiber gripper or textured rubber holder to prevent bending or microfractures during stripping . By following these methods and using the appropriate tools, multimode steel wire optical cables can be stripped safely and efficiently, ensuring reliable splicing and connectorization.