title: 40 GHz pulse source based on cross-phase modulation-induced focusing in normally dispersive optical fibers.
abstract: We theoretically and experimentally investigate the design of a high-repetition rate source delivering well-separated optical pulses due to the nonlinear compression of a dual-frequency beat signal within a cavity-less normally dispersive fiber-based setup. This system is well described by a set of two coupled nonlinear Schrödinger equations for which the traditional normally dispersive defocusing regime is turned in a focusing temporal lens through a degenerated cross-phase modulation process (XPM). More precisely, the temporal compression of the initial beating is performed by the combined effects of normal dispersion and XPM-induced nonlinear phase shift provided by an intense beat signal on its weak out-of-phase replica co-propagating with orthogonal polarizations. This adiabatic reshaping process allows us to experimentally demonstrate the generation of a 40 GHz well-separated 3.3 ps pulse train at 1550 nm in a 5 km long normally dispersive fiber.
authors.forename: Javier
authors.initials: J
authors.lastname: Nuño
authors.forename: Marin
authors.initials: M
authors.lastname: Gilles
authors.forename: Massimiliano
authors.initials: M
authors.lastname: Guasoni
authors.forename: Bertrand
authors.initials: B
authors.lastname: Kibler
authors.forename: Christophe
authors.initials: C
authors.lastname: Finot
authors.forename: Julien
authors.initials: J
authors.lastname: Fatome