11.5 Differences between step index fibres and graded index fibres
| Step Index Fibre | Graded Index Fibre |
|---|---|
|
1. The refractive index of the core is uniform and step or abrupt change in refractive index takes place at the interface of core and cladding in step index fibres. |
1. The refractive index of core is non-uniform, the refractive index of core decreases parabolically from the axis of the fibre to its surface. |
|
2. The light rays propagate in zig-zag manner inside the core. The rays travel in the fibre as meridional rays and they cross the fibre axis for every reflection. |
2. The light rays propagate in the form of skew rays or helical rays. They will not cross the fibre axis. |
|
3. Signal distortion is more in case of high-angle rays ... |
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