This calculator will help you to compute the polarization-maintaining (PM) optical fiber. Will require to enter either of the following: $\triangle n$ and wavelength OR $\triangle \beta$ and wavelength

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$\triangle\beta$=$\frac{2 \pi}{\lambda}\triangle n$
$\triangle n$=$\frac{\lambda}{2 \pi}\triangle \beta$
$L_b$=$\frac{\lambda}{\triangle n}$

Index Difference $\triangle n$; The Propagation Constant difference between the polarization modes $\triangle \beta$; Wavelength $\lambda$; Beat Length L$_b$


Input

Index Difference, $\triangle n$:

Wavelength, $\lambda$:
nm

The Propagation Constant difference between the polarization modes, $\triangle \beta$:
$m^{-1}$


Output
Beat Length, L$_B$:
mm