Single Mode Fiber
A single mode fiber is a fiber that has a small core, and only allows for one mode of light to propagate at a time. It is commonly used for high speed, long-distance applications. Single mode fibers are less susceptible to attenuation than multimode fibers.
Single mode fiber is generally more expensive to use than multimode fiber because the accompanying equipment is more expensive than that used with multimode fiber. Single mode fiber is also called monomode fiber, and generally has a core diameter of 9µm (micrometers).
Both single mode and multimode fibers have an overall diameter of 125µm. With both types of fiber the glass in the cladding layer has a slightly different refractive index than the core, preventing the light from escaping via the cladding.
Single Mode Fiber is also referred to as Single Mode Fiber.