40 GHz pulse source based on cross-phase modulation-induced focusing in normally dispersive optical fibers

Nuño, J., Gilles, M., Guasoni, M., Kibler, B., Finot, C. and Fatome, J. (2016) 40 GHz pulse source based on cross-phase modulation-induced focusing in normally dispersive optical fibers. Optics Letters, 41 (6), 1110-1113. (doi:10.1364/OL.41.001110).

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.

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