Not really my field, but I got curious and followed the rabbit hole. The article in question would be (in DOI) 10.1364/OL.32.003558, followed by erratum 10.1364/OL.33.002854, and then the comment by Trebino 10.1364/OL.34.002602, which is replied to in 10.1364/OL.34.002603.