Thanks for your reply. I will elaborate a little bit on what I am trying to do here using Interconnect.
In order to overcome the problem of limited modulation bandwidth that accompanies any high Q ring resonator, a new modulation method was proposed in which the coupler is modulated instead.
The earlier version of this design wasn’t differential. It used a single variable coupler. This is the case I want to investigate. According to the paper, there is a high pass filter effect in the coupling modulated ring when a long stream of ones occurs as shown below.
I would like to depict this in the simulation. So, I built the circuit below. I used the scripted optical modulator to model the variable phase shift in one of the arms of the variable coupler.
However, this is what I get. No high pass filter for long ones.
To double check the static frequency domain simulations are okay, I used an ONA to find the spectra of the ONE and ZERO states. There is something quite confusing here too; the ONE give low optical power while the ZERO gives high power. This contradicts with what happens in the time domain.