Modes of Fiber

You may heard about single Mode fiber and Multi Mode fibers.Modes of a fiber doesn't means that the number of frequencies supported by the fiber but it actually defines how the wave distributed in space or orientation of data wave inside the Fiber.More clearly, a single mode fiber will transmit different frequency data waves in a path parallel to the axis.Multi-mode fiber's will be used for to transmit different frequency waves in different paths/spacial paths.Don't be confused with the Wavelength used for the data transmission, a wave with definite wavelength is being used as a carrier for the different frequency data packets.For example 1300 nm Optical carrier will contains multiple frequency data and also same frequency data would be oriented differently in multi-mode fiber.