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September 8, 2015 at 10:19 am
#24436
Hi Chee,
I found that your MZMs were not biased properly at the null point. Biasing both of them at 2 and -2 for each arm results in a more linear transfer function for small electrical signals. In addition increase the samples per bit to at least 16 samples per bit.
There is still some error (and I disabled the FSO component for now) because the extinction ratio of the MZMs shifts the constellation diagram a bit. I do not know what MZMs you are limited to using but a larger extinction ratio is better. Also properly choosing the gain is important to balance the symbol separation and the distortion of the transfer function.
Try out the example attached.