Below we are showing the results of the simulation of an angled MMI coupler. Whereas regular MMI couplers can only produce 0/100 or 50/50 power splitting, the angled MMI is known to be able to produce adjustable splitting ratio by introducing a phase shift at the 3-dB imaging plane of the MMI [1].

In the animation sweep we have changed the angle in the MMI section from 0 to 2 degrees. According to theory we would expect, for this example, to reach the bar state at an angle of ~1.8 degrees, which agrees quite well with our animation. An example file of this angled MMI will be available in the example directory "Devices MMI" after installation of our software.

1. "Arbitrary ratio power splitters using angled silica on silicon multimode interference couplers", Q Lai, M Bachmann, W Hunziker, P Besse, H Melchior - Electronics Letters, 1996.

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