Reverse propagation of femtosecond pulses in optical fibers Posted on September 16, 2019 by mankei Mankei Tsang, Demetri Psaltis, and Fiorenzo G. Omenetto, Optics Letters 28, 1873 (2003) [PDF] The theory was rediscovered in the context of optical communications by X. Li et al., Opt. Express 16, 880 (2008). For femtosecond pulses, an experimental demonstration was reported by Pawłowska et al., Opt. Lett. 37, 2709 (2012).