Hello, when we use a dipole source to represent an emissive structure in FDTD, we place the source where the photons are being emitted from. I would just place the source in the middle of the MQW structure, the same as the non-MQW case. If you're unsure, you could also try running the simulation several times with the source placed in a different emissive layer each time to see if the result changes.
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