![]() # Single-Mod e Optical Fibe r Advant ages You can see in this image the two layers of the Optical Fiber, known as Core and cladding. This image shows the structure and working principle of the optical Fibre. Propagation of light inside optical fiber To understand the concept clearly look at the image shown below (Click on the image to enlarge it). This phenomena is known as total internal reflection, because in this phenomena, the light ray is reflected totally back into the same medium like reflection phenomena.Ĭonstruction and Working of the Optical Fiber Now we will see how this phenomenon of total internal reflection takes place inside the optical fiber. #OPTICAL FIBER SOURCES (DESIRABLE PROPERTIES) #ADVANTAGES OF OPTICAL FIBER COMMUNICATION This is called as total internal reflection. In this third case, when the light ray moves from denser to rarer medium, with an angle of incidence more than the critical angle, it returns back into the same denser medium. This is the same case that happens inside the optical fibre, when the light rays propagate through it. Now see the third case, it is the case where total internal reflection takes place. Critical angle is the angle of incidence, when angle of refraction is 90 degrees (when the light ray moves from denser tor rare medium). ![]() ![]() The second case shows the case of critical angle. Now look at the image, here you can see that, in the first case, when the incidence angle is less than the critical angle (the incidence angle, when the angle of refraction is 90° degrees), the light ray moves away from the normal in the rarer medium and goes into the rarer medium. Therefore the angle of refraction is more than the angle of incidence when the light rays move from denser medium to rarer medium. This deviation (refraction) can be seen in all the three cases shown in the image. As we know, when the light rays move from denser medium to rarer medium, then it deviates away from the normal, as you can see in the image.
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