Gaussian packet spreads as σ(t) = σ₀√(1 + (t/τ)²); group velocity ≠ phase velocity when dispersion present. Pulse broadening in optical fiber.
Gaussian packet spreads as σ(t) = σ₀√(1 + (t/τ)²); group velocity ≠ phase velocity when dispersion present. Pulse broadening in optical fiber.