Question: A T = 20 ps transform-limited pulse propagates through 10 km of a dispersive medium for which 2 = 12 ps 2 /km. The

A T = 20 ps transform-limited pulse propagates through 10 km of a dispersive medium for which β₂ = 12 ps²/km. The pulse then propagates through a second 10 km medium for which β₂ = −12 ps²/km. Describe the pulse at the output of the second medium and give a physical explanation for what happened.

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