Abstract

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, ${\mathrm{LP}}_{01}$, and the leaky, ${\mathrm{LP}}_{11}$. Such a phenomenon provides a new approach to the study of the propagation properties of the ${\mathrm{LP}}_{11}$ 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 ${\mathrm{LP}}_{11}$ mode is obtained in a simple and direct way for various fibers.

© 2001 Optical Society of America

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