Propagation in a multi mode interference device

Here is an example of beam propagation simulated in a multimode interference device. A single mode beam is expanded in many modes when entering the large wave guide which is deeply multimodal. Because of the differences of propagation speed, the modes interfere. The image of the input field is rebuilt ( all modes in phase) after L um, but two images are rebuilt at L/2 ... This allows the design of a power splitter.

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