I am working on DP-QPSK coherent system.I want to draw graph between OSNR and BER for the system. I read from the forum discussions that osnr can be calculated using wdm analyzer and ber from ber test set and then draw the graph but how can i change the values of osnr to get the graph as the wdm analyzer is displaying the single value of osnr at certain power. kindly tell me how can i change the values of osnr of wdm analyzer.
I also find the relation between osnr and ber from forum discussions– Log10 (BER) = 10.7-1.45 (OSNR).is this formula is applicable for all dual polarized modulation formats i.e dp-qpsk or dp-16qam.if not kindly tell me the relaion for different modulation formats.
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