// multi-utility computation suite · offline · instant · precise
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sci.fiber-dispersion-pulse-broadening Calculator
Calculates pulse broadening in optical fibre from dispersion coefficient D, length L, and spectral width Δλ: σ = D×L×Δλ. SMF-28 fibre at 1,310 nm (zero dispersion wavelength) has D ≈ 0 ps/(nm·km) — at 1,550 nm, D = 17 ps/(nm·km), limiting 10 Gbps transmission to ~60 km without dispersion compensation.
Inputs
D Ps Nm Km
Reference formula or conversion factor shown for context.
Lambda Nm
Distance between successive wave crests. Related to frequency: λ = speed / frequency.
Sigma Lambda Nm
Horizontal extent perpendicular to the length.
L Km
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Results
pulse broadening σ_t (ps)
Sample size or count used in the calculation.
bandwidth limit (GHz)
The computed width.
B×L product (GHz·km)
The result of multiplying all input values together.
σ_t = |D|·σ_λ·L
Reference formula or conversion factor shown for context.
ITU-T G.652 SSMF reference
Sample size or count used in the calculation.
dispersion compensation
ISP (specific impulse) — rocket engine efficiency in seconds. Higher ISP means more thrust per kilogram of propellant consumed.