Optical and electrical spectra of different MZM bias points
I am simulating a basic MZM at different bias points: Null, peak and quadrature. I follow the example that is shown in the Optisystem_Component_Library (pp. 736) without fiber.
I could see that the optical spectrum is ok, i.e. carrier suppression, strong carrier and multiple sidebands for null, peak and quadrature point.
However, the electrical spectra is not following the expected behavior. I mean that the generated electrical components are not right. For example, there should be some weak electrical carrier at 20 GHz, but I only can see the generated 40 GHz electrical component. It happens the same for peak and for quadrature point I can see the 20 GHz electrical carrier and 60 GHz electrical component, but I cannot see the 40 GHz electrical component (and it should be there).
Nevertheless, when I used fiber (for example 10 km), everything works fine!…: I can see the 20 GHz electrical carrier for null point, and 20, 40 and 60 GHz components for peak and quadrature point.
I think that something happens with fiber which makes the electrical spectra right. Some phase? I do not know…
Does anyone can help me? Because I need to show the MZM without fiber… but everybody will tell me that it is wrong.
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