I am trying to design a dual drive MZM using some measured data. I am trying to get simulation result using the following attached file. I have a couple of questions regarding the simulation.
As per the measurement data, if I select the device length near 550 um, the dual drive MZM should provide approximately 10 to 12 dB of ER, which is not shown by the simulation result. Can you please let me know where the error in the simulation is?
Similarly for the two-tone test to calculate the nonlinearity of the MZM, how can I achieve the result output IFoutput vs RF drive voltage for fundamental, second-harmonic and IMD? What should be the criteria to choose the frequency of the two RF signals?
Note: For the two-tone test refer to the papers:
B. Kolner, D. W. Dolfi, Intermodulation distortion and compression in an integrated electrooptic modulator, Applied Optics, vol. 26, no.1 pp.3676-3680, September 1987.
Y. Zhou et al., Linearity Measurement and Pulse Amplitude Modulation in a Silicon Single-Drive Push-Pull Mach-Zehnder Modulator, Journal of Lightwave Technology, vol. 34, no. 14, pp. 3323-3329, July 2016.