If you just need to have the transmission, I will recommend using the monitor, instead of the ports at the output. Port is a combination of mode source, mode expansion monitor, and DFT monitor. It is useful when you want to find out what portion of the total transmission of is coupling to 2D guided modes at a given cross-section or if you are calculating S-paramters of PIC components. I don't think it will be useful here. You can simply use a transmission (Frequency domain field and power) monitor. Lumerical doesn't have an angled monitors. This article provides more information on the workaround: Creating curved and angled monitors. But let me get some second opinion on this and get back to you.
Regards,
Amrita
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