MZI and AWG simulation in Interconnect

I have a question about the simulation result of AWG with MZI interleaved. But the simulation results do not make sense for me. Why the response is different with different FSR?

AWG_TEST1.icp (420.7 KB)

Could you please solve it?
Thanks a lot!

Hi @qi.han.1,

The FSR for the AWG looks to be consistent, it is the sidebands that makes the plot really confusing. It looks like outside the central bandwidth, the signal sidebands (for all channels) have really strong power so that they sometimes over-take the main channel band. You can add filters to the output of the AWG to compress the signal sidebands to solve this problem.