Four-Wave Mixing WDM Penalty Calculator
Nonlinear Optical Networking: Calculate Four-Wave Mixing (FWM) phase mismatch ($\Delta\beta$), generation efficiency ($\eta$), and crosstalk power ($P_{FWM}$).
WDM Grid & Fiber Dispersion
Nonlinear Fiber Characteristics
FWM Mixing Efficiency & Crosstalk
FWM Efficiency ($\eta_{FWM}$)
-- dB
Linear: -- %
Crosstalk Power ($P_{FWM}$)
-- dBm
In micro-watts: -- µW
Phase Mismatch ($\Delta\beta$)
-- rad/km
Phase matching condition
Signal-to-Crosstalk Ratio
-- dB
Effective Length Leff: -- km
Non-Zero Dispersion (NZDSF) Principle:
• If $D = 0$ (Dispersion-Shifted Fiber), phase mismatch $\Delta\beta = 0$, driving FWM efficiency to $100\%$ and destroying WDM signals.
• Modern NZDSF fibers (G.655) deliberately introduce small residual dispersion ($D \approx 2$–$6$ ps/(nm·km)) to suppress FWM phase matching.
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