Construction of Fiber
An optical fiber consists of a core, cladding and buffer (a protective outer coating). The cladding guides the light along the core by using the method of total internal reflection. In the glass fiber core and cladding are made of high quality silica glass.
Principle of Optical Communication
Optical fiber communication works on the principle of Total Internal Reflection.
Total Internal Reflection
– For all angles of incidence greater than the critical angle, the incident ray will get reflected back into the denser medium itself. This phenomenon is called total internal reflection.
Wavelengths in Optical Fiber
Normally we use light wavelengths around 850, 1310 and 1550 nm for fiber optics with glass fibers. These wavelengths are falling in the infrared region and having less attenuation.