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Recently, Chen \em et al \rm.\ [Phys. Rev. A 84, 033835 (2011)] reportedobservation of anticorrelated photon coincidences in a Mach-Zehnderinterferometer whose input light came from a mode-locked Ti:sapphire laser thathad been rendered spatially incoherent by passage through a rotatingground-glass diffuser. They provided a quantum-mechanical explanation of theirresults, which ascribes the anticorrelation to two-photon interference. Theyalso developed a classical-light treatment of the experiment, and showed thatit was incapable of explaining the anticorrelation behavior. Here we show thatsemiclassical photodetection theory---i.e., classical electromagnetic fieldsplus photodetector shot noise---does indeed explain the anticorrelation foundby Chen \em et al \rm.\ The key to our analysis is proper accounting for thedisparate time scales associated with the laser's pulse duration, thespeckle-correlation time, the interferometer's differential delay, and theduration of the photon-coincidence gate. Our result is consistent with thelong-accepted dictum that laser light which has undergone linear-opticstransformations is classical-state light, so that the quantum and semiclassicaltheories of photodetection yield quantitatively identical results for itsmeasurement statistics. The interpretation provided by Chen \em et al \rm. fortheir observations implicitly contradicts that dictum

Comment on "Observation of anticorrelation in incoherent thermal light fields"