What is the Step Index Optical Fiber ? 

Step Index Optical Fiber

Basically a step index fiber in which the refractive index of the core is uniform throughout the length of the fiber. and step index The fiber refractive index undergoes an abrupt change (such as a step function) at the cladding boundary. And it has single mode as well as multimode step index fiber. And this diameter of the core is about 50 to 200µm in case of multimode fiber and 10µm in case of single mode fiber. The step index fiber ri of the cladding is slightly lower than that of the core. These fiber rays of light are given a path confined to the plane of the fiber core axis as they pass through the step index fiber. The rays are called meridional rays. Step index Fiber loss and pulse distortion are high Information carrying capacity is low.