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ModeSYS Encircled Flux (EF) Simulation

Tools Used:

OptSim, ModeSYS.

The encircled flux is a measure of the amount of optical power that falls within a given radial distance from the fiber axis. Consider the layout as shown below which illustrates a topology with a multimode fiber and the encircled flux analysis tool:

Topology | Synopsys

The encircled flux and radial intensity plots corresponding to above layout are shown below:

Encircled flux and radial intensity plots | Synopsys
Average Radial Intensity vs. R | Synopsys

The encircled flux plot above correctly shows that the integrated power at the fiber axis (r = 0) is zero and that it rises quickly, peaking at about 8 microns. Because the encircled flux is normalized by its maximum value, it ranges from 0 to 1.