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A glass fibre exhibits material dispersion given by $\left|\lambda^2 \frac{d^2 n}{d \lambda^2}\right|$ of 0.025. Determine the material dispersion parameter at a wavelength of $0.85 \mu \mathrm{m}$, and estimate the pulse broadening per kilometer with a spectral width of $20 \mathrm{~nm}$ at this wavelength.