The coupling of an ultrashort laser pulse into a single-mode optical communication fiber gives rise to two propagating pulses as a result of the excitation of two guided modes, the fundamental, LP<sub>01</sub> , and the leaky, LP<sub>11</sub> . Such a phenomenon provides a new approach to the study of the propagation properties of the LP<sub>11</sub> mode. An experiment with tunable 110-fs pulses at a wavelength near 1550 nm is described. Information about the group velocity, the polarization-rotation length, the attenuation coefficient, and the cutoff wavelength of the LP<sub>11</sub> mode is obtained in a simple and direct way for various fibers.
© 2001 Optical Society of America
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2430) Fiber optics and optical communications : Fibers, single-mode
(060.5530) Fiber optics and optical communications : Pulse propagation and temporal solitons
Ilaria Cristiani, Luca Tartara, Gian Piero Banfi, and Vittorio Degiorgio, "Ultrashort-pulse investigation of the propagation properties of the LP11 mode in 1.55-μm communication fibers," Opt. Lett. 26, 1758-1760 (2001)