Application of large diameter fiber fusion splicer in laser source maintenance

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Application of large diameter fiber fusion splicer in laser source maintenance

2025-04-17

In the field of industrial laser sources, large diameter fiber is widely used in core components such as pump sources, combiners, and QBH interfaces because of its high power transmission capability. Fiber connection failures (such as breakage and excessive loss) of these components directly affect laser performance and even cause equipment downtime. Traditional splicers are difficult to meet the splicing needs of large core fiber, while large diameter fiber splicers have become key equipment for laser maintenance due to their unique technical advantages. Shinho S-37 large diameter fiber fusion splicer is popular with laser soucer repair industry.

Next, we will analyze the application technology of large core splicers in laser core component maintenance.

Application in laser core component maintenance

(1) Pump source pigtail repair: efficient splicing of multimode optical fiber
1. Typical failure scenarios
The semiconductor pump source pigtail often causes the fiber to overheat and melt due to poor heat dissipation (such as the case of the pigtail burning of the Keplin 1500W laser), and the 200/220μm multimode pigtail needs to be replaced.
2. Repair effect

The welding loss is stable below 0.02dB, and the output power fluctuation of the pump source after repair is less than 1%, which meets the long-term operation requirements of industrial-grade lasers.

(2) Repair of fiber inside the combiner: Multi-fiber parallel fusion technology
1. Complex working conditions
The 7×1 pump combiner contains 7 200/220μm pump fibers and 1 20/400μm signal fiber. When fusion splicing, the concentricity of fibers with different diameters needs to be handled (deviation <2μm), and the fusion point is prone to overheating (temperature rise >30℃) due to cladding light leakage.
2. Key technical solutions
Cladding corrosion process: The 200μm pump fiber is etched with hydrofluoric acid (concentration 30%, time 5 minutes) to reduce the cladding diameter to the cladding size of the 400μm signal fiber (400μm), eliminating the fusion gap caused by the diameter difference.

Step-by-step splicing strategy: first splice the signal fiber with a single pump fiber (loss < 0.05dB), then splice the remaining pump fibers in sequence. After each splicing step, use thermal conductive glue (aluminum nitride-based) to fill the gap to reduce heat accumulation.

(3) QBH interface fiber repair: high-power transmission reliability guarantee
1. Failure mode analysis
The QBH interface caused the 200/220μm fiber to wear and break due to frequent plugging and unplugging, or the core burned under high power due to the lack of end caps (such as the QBH failure of the Chengying laser welding machine).
2. Fusion optimization solution
End cap fusion technology: 100μm quartz end caps are fused at the end of the optical fiber to increase the energy receiving area (reduce the energy density to <10kW/cm²) to avoid core damage under high power.
Cladding light stripping: High refractive index glue (refractive index 1.5) is applied 20mm after the fusion point to strip the leaked cladding light (stripping efficiency >95%) and reduce thermal damage to the connector.

The large diameter fiber fusion splicer effectively solves the multimode fiber fusion problem in the maintenance of laser core components through technological innovation. In the repair of key components such as pump sources, combiners, and QBH interfaces, its fusion loss control, thermal management capabilities, and reliability assurance technologies have significantly improved the maintenance efficiency and equipment operation stability.

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