Stripping Techniques for Small Optical Cables

Effective stripping of small optical cables requires precision tools, careful layer-by-layer removal, and proper handling to avoid fiber damage.

Key Principles

Stripping optical fibers involves removing protective coatings and jackets without nicking or scratching the glass core, which can lead to cracks or connection failures under stress or thermal cycling. Small optical cables, such as single-fiber cables with diameters of 2–3 mm, require progressive stripping: first the outer jacket, then aramid yarn, and finally the buffer coating. Each layer often needs a different tool or setting to ensure the underlying fiber remains intact.

Tools and Methods

Mechanical Strippers

Precision hand tools with multiple slots for different coating diameters (e.g., 250 µm buffer, 900 µm tight buffer, 2–3 mm jacket) are commonly used. Adjustable strippers allow fine-tuning of the blade gap to prevent fiber breakage. Small Allen wrenches can adjust the slot by microns for optimal stripping.

Examples include the Greenlee Pro Grip 5-in-1 and Clauss CFS series.

Thermal Strippers

Use controlled heat to soften polymer coatings for easy removal without mechanical stress. Suitable for fibers with non-standard diameters or high-temperature coatings. Devices like the Vytran FFS-2000 or FiberStrip 7030 are commonly used.

Chemical Stripping

Involves solvents or acids (e.g., sulfuric acid or paint strippers) to dissolve coatings. Requires careful handling and compliance with safety regulations, as some chemicals are hazardous. Coating softens in about a minute and can be wiped away with lens tissue.

Best PracticesLayer-by-layer stripping: Always remove the outer jacket first, then aramid yarn, and finally the buffer coating. Limit strip length: Typically 30–50 mm at a time to avoid fiber stress. Maintain tools: Keep blades sharp and clean to ensure smooth cuts.

Excess fiber: Leave extra fiber at cable ends to allow for mistakes during stripping and connectorization. Cleaning: After stripping, remove any residue using appropriate solvents or lens tissue to ensure a clean fiber end. Specialty ConsiderationsSmall-diameter fibers (e.g., 200 µm coatings) require strippers with smaller holes or precise automated systems.

Loose tube or armored cables may need specialized slitting tools for longitudinal or circumferential cuts. Window stripping: For applications like fiber Bragg gratings, a short section of coating may be removed mid-fiber rather than at the end. By following these techniques and using the appropriate tools, technicians can safely strip small optical cables, ensuring high-quality splicing and connectorization while minimizing the risk of fiber damage.