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HI Damian,

I have not link of this article.but I can write down text in here.

“The Continuous wave is 4APSK modulated by a DPMZM, in particular, the two sub-modulators of the DPMZM are biased at null point and driven by 10Gbit/s Data1 and Data2, respectively, to generate two BPSK signals with unequal amplitudes.The two BPSK signals are then constructively added by adjusting Bias-C such that a 4APSK signal can be obtained”

Can it help you make built modulator? I’m still trying to it in 1026edit.osd file. but not succeeded.