Fiber Bundle

To achieve high throughput with flexible glass or plastical optical fibers, multiple fibers are often arranged in a bundle. This is also desirable when light sources are not point-like and thus cannot be focused to small diameters. However light losses are inevitable for two reasons:
1.For a given fiber, the maximum usable area is defined by the core and cladding diameters. These diameters determine the fiber packing factor (FPF).
2.When fibers are arranged in a bundle, not all of the bundle cross-sectional area is filled with fibers, even when tightly packed arrangements are used. The particular packing arrangement defines the bundle packing fraction (BPF).

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