| Sr.no. | Step index fibre | Graded index fibre. |
| 1 | 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. |
| 2 | 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. |
| 3 | The light rays propagate in zig-zag manner inside the core. | The light rays,propagate in the form of skew rays or helical rays. |
| 4 | The rays cross the fiber axis for every reflection. | The rays will not cross the,fiber axis. |
| 5 | They can be manufactured easily. | They manufacturing process is complex. |
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