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

The core diameter of typical single-mode fiber is indeed in the range of 8-10 micrometers. This small core size is essential for single-mode fiber operation as it allows only one mode of light to propagate through the fiber, reducing modal dispersion and enabling longer transmission distances with higher bandwidth capabilities. The smaller core effectively supports a single light path that travels straight down the fiber, which is key for achieving the high-performance characteristics associated with single-mode fibers in telecommunications and data communication applications.

In contrast, other core sizes listed are generally associated with multi-mode fibers, which have larger diameters to allow multiple light paths or modes. The larger cores (like those found in multi-mode fiber) can lead to increased modal dispersion, which is undesirable for long-distance communication as it can cause signal degradation. Thus, the correctly identified core diameter of 8-10 micrometers reflects the specific design and purpose of single-mode fibers.