In standard light guides the fibers in the ferrules are glued together and to the ferrule before the end faces are ground and polished. Light guide end faces treated this way can withstand temperatures up to 200°C. Where operation in excess of 200°C is required or in case of harsh mechanical conditions, a hot fused technique is required, a unique end termination process in which no glue is used and the fiber ends are fused together in a stainless steel ferrule.
The benefits of hot-fused ends are:
- High temperature resistance up to 350°C.
- Application with high power light sources
- Transmission increase of up to 15% compared to glued fiber ends due to a higher packing density.
Light guides with hot-fused ends are particularly suitable for the following applications:
- Approximation switches
- Spark control