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There are three types of fiber optic cable commonly used: single mode, multimode and plastic optical fiber (POF). Transparent glass or plastic fibers which allow light to be guided from one end to the other with minimal loss. Typical multimode fibers have a core diameter/cladding diameter ratio of 50 microns/125 microns (10-6 meters) and 62.5/125 (although 100/140 and other sizes are sometimes used depending on the application). Single mode fibers have a core/cladding ratio of 9/125 at wavelengths of 1300nm and 1550nm. Having a general understanding of fiber optics and the different fiber and connector types that are available will allow you to have a more productive conversation Optical fibers are classified into two types based on the refractive index profile of core and cladding. They are a. Step index fiber b. Graded index fiber. The research literature on optical fibers is vast, and by virtue of necessity the Initially, two classes of fiber emerged to exploit this property of waveguideThis type of fiber is used for in-house phone lines and data links. Graded-index fiber offers one method for minimizing dispersion. The index of refraction of the core Both fiber types can have the same numerical aperture (NA) because. NA is independent of the fiber core diameter! Step-index silica optical fiber cross-section Three basic types of fiber optic cable are used in communication systems: 1. Step-index multimode 2, Step-index single mode 3, Graded-index This is illustrated in Figure 8-2. Step-index multimode fiber has an index of refraction profile that “steps” from low to high to low as measured from cladding to core to cladding. new type of fibre, known as the dry or low water peak fibre has been developed with the property that fibre losses are small over the entire wavelength region new type of fibre, known as the dry or low water peak fibre has been developed with the property that fibre losses are small over the entire wavelength region In both types of waveguide light propagates in the form of modes. Each mode travels along the axis of the waveguide with a distinct propagation constant and