## Pre-FEC BER corresponding to Q.

- BER and Q can be calculated from one another according to the following relationship:

- Or, in Excel: dBQ = 20*LOG10(-NORMSINV(BER))
- dBQ = 20Log(Q)

## Post-FEC BER/Q

- Post-FEC BER of <1e-15 essentially means no post-FEC errors
- This is equivalent to ~18dBQ, w…