8.a. Which of the following statements about OSNR and BER is correct? A. BER isn't related to OSNR. B. Lower BER leads to a lower OSNR. C. Higher BER leads to a higher OSNR. D. Higher BER leads to a lower OSNR. 8.b. An optical signal has a strength of 2.1 mW. What's this value in dBm? A. 2.11 dBm B. 2.32 dBm C. 3.10 dBm D. 3.22 dBm

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