March 2022
Intermediate to advanced
864 pages
28h 54m
English
Content preview from Optical Fiber Sensing Technologies
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1Optical Fiber and Optical Devices
1.1 Optical Fiber
Optical fibers are used most often as a flexible medium to transmit light. The external diameter of optical fibers is several hundreds of microns, and the most commonly used optical fiber in communication has a tiny diameter of only 125 μm. It makes optical fiber have inherent dimension advantage compared with other information transmission medium. As a cylindrical waveguide, the optical fibers usually have two layers with different refractive indices to achieve total internal reflection. The refractive index (RI) of fiber core ncore is higher than that of fiber cladding nclad; hence the light energy is kept in the thinner core and transmitted along the fiber. Figure 1.1 shows the cross ...
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