i am designing a DP-QPSK WDM system with 4 channels. but i am unable to find the eye openings or get BER. in the sampl examples the given design usues only one DP-QPSK transmitter and output is measured using BER tester i dont know how to use it, whats its meaning and how to interpret results on it. kindly help me. we have purchased optisystem 13.0 recently and i am new to it . so find it difficult .
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