A step index multimode fiber with a numerical aperture of 0.2 supports approximately 1000 modes at an 850-nm wavelength. a) What is the diameter of its core? b) How many modes does the fiber support at 1320 nm? c) How many modes does the fiber support at 1550 nm?
Added by Johnny R.
Step 1
We are given $N = 1000$, $\lambda = 850 \ nm$, and $NA = 0.2$. We can rearrange the formula for $V$ to solve for $a$: $a = \frac{V \cdot \lambda}{2\pi \cdot NA}$ Show more…
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