Hawking radiation has been regarded as a more general phenomenon than ingravitational physics, in particular in laboratory analogs of the eventhorizon. Here we consider the fiber-optical analog of the event horizon, whereintense light pulses in fibers establish horizons for probe light. Then, wecalculate the Hawking spectrum in an experimentally realizable system. We foundthat the Hawking radiation is peaked around group-velocity horizons in whichthe speed of the pulse matches the group velocity of the probe light. Theradiation nearly vanishes at the phase horizon where the speed of the pulsematches the phase velocity of light.
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