Hello,
Resonators typically require a long simulation time to ensure that the energy in the simulation has sufficiently decayed; this is a common cause for transmission greater than 1 (Transmission Results Greater Than One – Ansys Optics).
However, I think the most likely cause of this issue is the placement of the port with anomalous results. Could you perhaps clarify where the port is placed to measure the transmission “inside the ring resonator”? If the port is placed on the ring itself, this could cause the high transmission value. To measure the outcoupled light, the port should be placed on one of the waveguides exiting the simulation region.
If this is not the issue, there could be an issue with the PML settings. If you have not already done so, a movie monitor can be helpful to check if the PML is not absorbing as it should. As a next step, you can try to make sure that the monitors are at least λ/2 away from the PML boundaries.
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