Thank you very much for your excellent reply!
The publication is <C-Band Optical 90 Hybrids in Silicon Nanowaveguide Technology>,IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 23, NO. 23, DECEMBER 1, 2011.
Missing the taper of input and output is to simplify the simulation. I’ve ran the modified file twice for only input port 1 in and input port 3 in, and exported the angle data of four outputs.
Rectangle in1 enable and rectangle in3 disable. Run the file. Export the data angle of S21,S31,S41 and S51 for four outputs(set them as Ai1o1,Ai1o2,Ai1o3 and Ai1o4).
Rectangle in3 enable and rectangle in1 disable. Run the file. Export the data angle of S21,S31,S41 and S51 for four outputs (set them as Ai3o1,Ai3o2,Ai3o3 and Ai3o4).
Phase shift of four ports: p1=Ai3o1-Ai1o1, p2=Ai3o2-Ai1o2, p3=Ai3o3-Ai1o3, p4=Ai3o4-Ai1o4
Phase shift with reference at output 1: phase21=p2-p1, phase31=p3-p1, phase41=p4-p1.
The following plot is about phase21, phase31, and phase41, while phase21 , phase31, and phase41 should be 3/2pi, pi and 1/2pi. How should I modify the file?
The attachment is the calculated phase21,phase31 and phase41.phaseshift.dat (22.3 KB)