Leading you to an educated decision. Singlemode fiber optic
cable has a small core and only one pathway of light. With only
a single wavelength of light passing through its core,
singlemode realigns the light toward the center of the core
instead of simply bouncing it off the edge of the core as with
multimode. Singlemode is typically used in long-haul network
connections spread out over extended areas--longer than a few
miles. For example, telcos use it for connections between
switching offices. Singlemode cable features a 9-micron glass
core.