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Dispersion Penalty


The result of dispersion in which pulses and edges smear making it difficult for the receiver to distinguish between ones and zeros. This results in a loss of receiver sensitivity compared to a short fiber and measured in dB. The equations for calculating dispersion penalty are as follows:

Where:
ω = Laser spectral width (nm)
Dλ = Fiber dispersion (ps/nm/km)
τ = System dispersion (ps/km)
f = Bandwidth-distance product of the fiber (Hz • km)
L = Fiber length (km)
FF = Fiber bandwidth (Hz)
C = A constant equal to 0.5
FR = Receiver data rate (b/s)
dBL = Dispersion penalty (dB)

Dispersion Penalty