Optical Fiber Mode Stripper Structure for Beam Quality and Service Life

The patent replaces the thermal marking process with a mechanical drilling process. Instead of using a carbon dioxide marking machine that generates thermal effects, the invention uses a drilling device with a drill bit to physically create holes in the cladding layer. This mechanical approach eliminates the thermal warping and beam quality degradation while still achieving waveguide structure damage for mode stripping.

The patent changes the fundamental parameter of the marking process from thermal energy input to mechanical removal. By transitioning from thermal marking to mechanical drilling, the process parameters change from temperature and energy density to drilling speed, hole depth, and hole distribution, thereby eliminating the harmful thermal effects while maintaining the mode stripping function.

The patent replaces the thermal marking process that generates harmful powder and heat with a mechanical drilling process. The drilling device directly removes material to create holes without generating melting powder, thereby eliminating the chain reaction of powder accumulation, absorption rate changes, heat generation, and optical fiber damage, thus extending service life.

The patent converts the harmful thermal effect and powder generation into a beneficial mechanical removal process. By using mechanical drilling instead of thermal marking, the process that originally caused harm (thermal effects and powder accumulation) is transformed into a clean mechanical process that achieves the same mode stripping goal without the harmful side effects.

The patent applies local quality by creating discrete holes at specific locations in the cladding layer rather than applying a continuous thermal mark. The holes are distributed at optimized intervals and positions, allowing the mode stripping function to be achieved locally at each hole while preserving the overall structural strength of the optical fiber. This localized approach enables both high stripping efficiency and maintained strength.

The patent segments the continuous marking region into discrete, separated holes. Instead of a continuous thermal mark that limits the usable region size, the invention creates multiple individual holes distributed along the optical fiber. This segmentation allows the mode stripping function to be distributed across multiple locations, achieving high efficiency while maintaining structural integrity in the spaces between holes.