A T = 20 ps transform-limited pulse propagates through 10 km of a dispersive medium for which
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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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