LIRsäteilyä

LIRsäteilyä is a Finnish term that translates to "fringe radiation" in English. It refers to electromagnetic radiation that is emitted from the edges or boundaries of optical fibers. When light travels through an optical fiber, a small portion of it can escape from the fiber core at points where the fiber is not perfectly terminated or where there are imperfections. This escaping light is known as fringe radiation.

This phenomenon is particularly noticeable at fiber optic connectors, splices, or any other point where the fiber's integrity is compromised. The amount of fringe radiation generated depends on factors such as the angle of incidence of the light, the quality of the fiber termination, and the presence of any physical damage or debris. While generally a small percentage of the total transmitted light, it can be significant in certain applications.

In some cases, fringe radiation can lead to signal loss within the fiber itself. It can also cause interference issues if it couples into other nearby optical components or systems. Therefore, careful handling and termination of optical fibers are essential to minimize the generation of fringe radiation and ensure optimal performance of optical communication systems. Techniques like precise cleaving and polishing of fiber ends are employed to reduce this effect.