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Compare step- index and graded-index fiber.
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written 8.5 years ago by
teamques10
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• modified 8.5 years ago |
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| 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 fibers. | The refractive index of core is non-uniform, the refractive index of core decreases parabolically from the axis of the fiber to its surface. |
| 2 | The light rays propagate in zig-zag manner inside the core. The rays travel in the fiber as meridional rays and they cross the fiber axis for every reflection. | The light rays,propagate in the form of skew rays or helical rays. They will not cross the,fiber axis. |
| 3 | Step index fiber is of two types viz; mono mode fiber and multi mode fiber. | Graded index fiber is of only one type,that is multi mode fiber. |
| 4 | The refractive index of the core of step index fiber is constant throughout the core. | The refractive index of the core of the graded index fiber is maximum at center,core and then it decreases towards core-Cladding interface. |
| 5 | The refractive index profile may be defined as:  |
The refractive index profile may be defined as:  |
| 6 | Number of modes for step index fiber $M_s=\frac{V^2}2$. V number can be less that 2.405 or more that 2.405 for step index | Number of modes for graded index fiber is $M_g=\frac{v^2}4$. |
| 7 | Modal dispersion affects signal quality in step index fiber. | Graded index fiber,provides zero dispersion as the velocity of modes is changed by changing R.I,such that time taken by all modes is same. |
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