What is the typical core diameter of single-mode optical fiber?

The typical core diameter of single-mode optical fiber is 9 microns. This specific size is crucial because single-mode fibers are designed to allow the light to travel through a single path or mode, which minimizes signal loss and dispersion over longer distances. The 9-micron core diameter is optimal for maintaining the light wave's integrity, enabling high-bandwidth data transmission and making this type of fiber particularly effective for telecommunications and data networking applications. Other core sizes, while relevant for different types of fiber optics, do not meet the performance standards set by single-mode fibers for long-distance transmission.