Generation of optical domain-wall structures from modulational instability in a bimodal fiber.
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.
Pitois
S
S
Laboratoire de Physique, Université de Bourgogne, 9 Avenue Savary, Boîte Postale 47 870, F-21078 Dijon, France.
Millot
G
G
Grelu
P
P
Haelterman
M
M