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Hi Dhiman,
As far as I know, it is only the Shannon theory that relates bit rate and bandwidth by C=B*log(1+S/N) to estimate the channel capacity. Even though I have searched for it, I haven’t found any relationship between these two, except for some experimental relations like the ones in Optisystem samples in script mode.
I always watch the symbols in constellation visualizer before making the relation in the script to see if the symbols are drawn to the origin. If they are, then some frequencies the symbols are becoming zero (due to being filtered) and it shows that my allocated bandwidth is not enough and it is eliminating some symbols, so I have to increase it.
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