title: Generation of optical domain-wall structures from modulational instability in a bimodal fiber.
abstract: We study experimentally modulational instability in a normally dispersive bimodal fiber under modal group-velocity-matching conditions. In the strong pump depletion regime, higher order sideband harmonics detected in the output spectra as well as autocorrelation measurements reveal the formation of subpicosecond domain-wall structures. Across these temporal structures the electromagnetic field distribution switches abruptly between the two transverse modes of the fiber. These structures are reminiscent of the so-called domain-wall soliton. Our results constitute therefore an experimental indication of the existence of this fundamental soliton.
authors.affiliation: Laboratoire de Physique, Université de Bourgogne, 9 Avenue Savary, Boîte Postale 47 870, F-21078 Dijon, France.
authors.forename: S
authors.initials: S
authors.lastname: Pitois
authors.forename: G
authors.initials: G
authors.lastname: Millot
authors.forename: P
authors.initials: P
authors.lastname: Grelu
authors.forename: M
authors.initials: M
authors.lastname: Haelterman