Optical Link OSNR Budget and BER Calculator
DWDM Telecom Network Design: Calculate cascaded EDFA optical signal-to-noise ratio ($OSNR_{0.1nm}$), linear Q-factor, and Pre-FEC Bit Error Rate ($BER$).
Link Topology & Launch Power
EDFA In-Line Amplifiers
OSNR & Bit Error Rate Budget
End-of-Line $OSNR_{0.1nm}$
-- dB
Total Link: -- km
Pre-FEC Bit Error Rate
--
Q-Factor: -- dB
Span Loss ($A_{span}$)
-- dB
Cumulative Loss: -- dB
FEC Margin
-- dB
Standard SD-FEC threshold
Cascaded OSNR Equation:
• $OSNR_{0.1nm} = P_{ch} - A_{span} - NF - 10 \log_{10}(N) + 58 \text{ dB}$.
• Soft-Decision FEC (SD-FEC) successfully corrects Pre-FEC $BER \le 2.4 \times 10^{-2}$ to error-free $BER < 10^{-15}$.
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