written 17 months ago by | • modified 17 months ago |
Calculate the number of modes at $820 \mathrm{~nm}$ in a graded index fibre having a parabolic index profile $\left(\alpha_1=2\right)$, a $25 \mu \mathrm{m}$ core radius, $n_1=1.48$ and $\mathrm{n}_2=146$. How does this compare to a step-index fiber?