Dear Heitor and Ravil, please go through the attached osd file. i am trying to generate millimeter wave using optical frequency multiplication. My input RF frequency is 15GHz using which i am generating 2nd ,3rd,and 4th order harmonics at the detector. if I set the Filter center frequency as 15 GHz,30GHz i am getting smooth sine wave, if i set center frequency as 60GHz and above i am getting distorted/or irregular sinusoidal signal? Why? How to set global parameters? please give me some idea. Thanks in advance to u both. optisystem v12