Single Mode Step Index Optical Fiber

In single mode step index fiber there is no distortion.

Single mode step index optical fiber.

These modes define the way the wave travels through space i e. Step index means sharp step in the index of refraction between core and cladding interface. There are several causes of attenuation in an optical fiber. Multimode graded index fiber.

Waves can have the same mode but have different frequencies. Rayleigh scattering microscopic scale variations in the index of refraction of the core material can cause considerable scatter in the beam leading to substantial losses of optical power. Therefore this type of step index fiber is known as single mode step index fiber. Single mode step index optical fiber structure and plot it is also a step index fibre but due to its small diameter of the core 2 10 micrometre it can support only single mode of light.

In fiber optic communication a single mode optical fiber is an optical fiber designed to carry only a single mode of light the transverse mode. A step index fiber is characterized by the core and cladding refractive indices n1 and n2 and the core and cladding radii a and b. Examples of standard core and cladding diameters 2a 2b are 8 125 50 125 62 5 125 85 125 or 100 140 units of µm. Single mode step index fiber.

Modes are the possible solutions of the helmholtz equation for waves which is obtained by combining maxwell s equations and the boundary conditions. The diameter of the core is between 50 200µm in the case of multimode fiber and 10µm in the case of single mode fiber. The step index profile is used in most single mode fibers and some multimode fibers. How the wave is distributed in space.

This is the case in. Typical values range from 10 db km for step index fibers at 850 nm to a few tenths of a db km for single mode fibers at 1550 nm. The fiber has lower bandwidth. In single mode light takes single path through the fiber core.