(a) Measured performance of the integrated 220/230 GHz FSF. The red S21 and blue S41 lines show the transmission from the input port to the LSB and USB output ports, respectively. The dots show the measurement data, and dashed lines show the simulated performance. (b) Fitting analysis results obtained in the same manner as in figure 7b for the integrated 220/230 GHz FSF. (Color online)