Why Choose Shinho S37 Large Diameter Fiber Fusion Splicer?

The core reason for choosing the high-precision S37 fiber fusion splicer over a smaller, cladding-aligned splicer when repairing lasers is that lasers use large-core-diameter specialty fibers with extremely high precision requirements, and the S37, with its core alignment, is the only option that can guarantee the quality of the splice.

The technological differences between these two types of splicers determine their vastly different performance in high-end applications like laser repair. The specific nature of laser repair makes the advantages of the S37 "essential."

1. Lasers use large-core-diameter fibers with cladding diameters ranging from 125μm to 680μm. Smaller, cladding-aligned splicers typically cannot handle such thick fibers, while the S37 is specifically designed for handling 125-680μm large-core-diameter fibers.

2. Extremely low loss is essential: Lasers are high-precision devices, and any additional splice loss will significantly affect the laser's output power and performance stability. The S37's core alignment technology can reduce the average splice loss to as low as 0.01dB - 0.03dB. However, due to inherent flaws in its design, cladding alignment results in significant fiber loss after splicing, which is unacceptable in laser maintenance.

3. Ensuring long-term stability is crucial: The high energy generated by the laser during operation poses a significant challenge to the long-term stability of the splice. The S37, with its real-time arc size calibration and adjustable position, ensures long-term reliability of the splice. Cladding alignment machines, on the other hand, have lower precision, leading to potential splice defects and possible failure later in use.

4. Handling complex fiber types is essential: Lasers contain various fiber types. The S37 supports the interfusion of fibers with different core diameters, offering high flexibility. Cladding alignment machines, with their narrower application range, struggle to handle this complexity.

Low splicing precision is like installing a crooked connector in a high-pressure water pipe for a high-power fiber laser—it won't explode immediately, but energy will leak out through the gap, turning into heat and triggering a chain reaction of thermal runaway. The process can be divided into four fatal stages:

Stage 1: Localized "Carbonization" at the Splice (Most Direct Consequence) Misalignment of the fiber core causes mode field mismatch when the optical signal passes through the splice, resulting in a significant leakage of laser energy from the core into the cladding (the outer shell of the optical fiber). The cladding coating strongly absorbs this leaked light energy, instantly generating temperatures of hundreds of degrees Celsius.

Consequence: The coating at the splice will be charred and carbonized, turning into black impurities. This further exacerbates light absorption, creating positive feedback, ultimately leading to the fusion splice glass shattering or melting. This is the least costly form of "burnout," but it still disrupts the optical path.

Stage 2: Output Head (QBH/End Cap) Burnout (High Probability Event) If the splice is inside the laser, the high temperature or impact from the fusion splice will cause a sharp increase in backscattered light within the fiber. This high-power backscattered light will directly impact the laser's output end (QBH fiber connector or end cap).

Consequences: The optical lenses or end cap coatings inside the QBH (Quick Base Laser) overheat and shatter instantly under reflected light. An imported QBH output head typically costs between 10,000 and 30,000 RMB, making replacement extremely costly.

Third Stage: Pump Source (LD Chip) Burnout (Most Fatal Consequence) Even more dangerous is the possibility of extremely strong backscattered light returning along the fiber optic path, directly striking the pump source (semiconductor laser chip) at the laser's front end.

Consequences: The chip inside the pump source is extremely sensitive to reflected light. This high-energy backscatter directly "burns" the chip's emitting end face, causing a permanent and drastic decrease in pump power, or even complete system failure. Laser repair often requires replacing the entire pump module; a single imported multimode pump module can cost tens of thousands to hundreds of thousands of RMB.

Fourth Stage: Entire System "Protective Shock" (Soft Burnout) Modern industrial lasers all have built-in optical power feedback sensors. Even if the laser is not physically burned out, the light leaking from the fusion joint will be identified as "abnormal scattered light" by the monitoring system. When the abnormal value exceeds the threshold, the control system will forcibly cut off the power supply and lock the laser within milliseconds.