Describing an optical waveguide that is designed to propagate light of only a single wavelength & perhaps a single phase; essentially, an optical fiber that allows the transmission of only one light beam, or data carrying lightwave channel, & is optimized for a particular lightwave frequency, compared with multimode. Single Mode Fiber: An optical fiber that will allow only one mode to propagate; this fiber is a step index fiber.

A type of optical fiber in which the light travels in a single path. Utilizes lasers as a light source.

Optical fiber with a small core diameter in which only singlemode is capable of propagation. 8.3 micron is the common standard core size.

Type of fiber optic cable that allows only one lightwave path.