1. Fiber and its use
1.1 Different types of fiber
1.1.1 Single-mode and multimode fibers
The fibers currently used in transmission, both single-mode and multimode, are rotationally symmetrical dielectric guides made up of concentric layers with different optical properties. In an ideal fiber, the refractive index n depends only on the distance r from the axis. The graph n (r ) is called the fiber's index profile. Figure 1 gives some examples of index profiles....
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Fiber and its use
Propagation modes of a single-mode fiber
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