Keep up with news and articles from the Impact ES network of manufacturing facilities.
Impact Electronic Solutions is pleased to announce the appointment of our new VP and General Manager for Impact...
Lake Oswego, OR — 7/30/2024 — Impact Electronic Solutions (Impact ES) is excited to announce that it has acquired...
Most multimode fibers are low OH but these fibers have high insertion loss below 400nm. Below 400nm High OH fibers are recommended.
Insertion loss in connectors typically comes from misalignment of the fibers or bent fibers in the connectors from active core alignment. The misalignment comes from eccentricity of the core in the fiber, eccentricity of the hole in the ferrule and most of all the eccentricity of the fiber in the hole. Bending of the fiber typically comes from the fiber being constrained at the back of the connector while the ferrule moves back during mating.
End-capping a fiber will narrow the NA by around 0.003 if the manufacturer is very careful; otherwise, the process of end-capping can narrow the NA substantially. The NA fiber manufacturers list on their datasheets are typically a theoretical value or the NA of the glass preform before drawing. From what we can gather, only one of the four suppliers we use for single-mode and PM fibers has ever measured the NA of a completed fiber. And that supplier reported the NA of the fiber as the diameter of the beam divided by the distance from the source, which resulted in an NA specification two times larger than how NA is typically defined. This possibly came from there not being an industry standard for measuring the NA out of a fiber. If you know of anyone who has verified the theoretical equations for calculating NA out of a visible wavelength single-mode fiber, we’d appreciate it if you let us know.
