You can also determine whether or not the Fresnel reflection of the (uncoated) fiber end is taken into account, and whether or not modes with very small power are displayed.

Gaussian beamsoftware

For example, in some diagram you could vary the magnitude of any kind of alignment error, of some parameter of the index profile, or the wavelength, and plot anything you like.

The calculation does not consider cladding modes. These, however, will usually exhibit much higher losses, so that after some propagation distance only the power in guided modes remains.

Gaussian beam

Here you can calculate how a Gaussian laser beam is coupled into a fiber. More precisely, it is calculated what optical powers get into the guided modes of the fiber – using the wavelength and corresponding modes as calculated in the “Guided modes” tab. The fiber end may be misaligned.

Lasercalculator

The results are obtained by calculating a complex overlap integral containing the transverse input beam profile and the mode profile.

Here we explain in detail how the RP Fiber Calculator software is used. Each of the menu items explains one of the tabs.

The calculated results are displayed below when you press the button “Calculate launch efficiency”. For each guided mode of the fiber, the fraction of the incident power which gets into that mode is displayed numerically and graphically. (For modes with non-zero <$l$> value, the two possible orientations are listed separately: the one with the <$\sin l \varphi$> dependence is indicated with a negative <$l$> value.)