The switching characteristics of a two-core optical fiber can be described by the beating of the even and odd modes of the composite two-core structure. It is shown that the group-delay difference between these two modes can be as large as 10 ps/m. This intermodal dispersion sets a limit on the shortest duration of the optical pulse that can be switched effectively in devices that use long lengths of two-core fibers, such as wavelength-division multiplexers, polarization splitters, and nonlinear directional couplers.
© 1995 Optical Society of America
Original Manuscript: November 16, 1994
Published: May 1, 1995
Kin S. Chiang, "Intermodal dispersion in two-core optical fibers," Opt. Lett. 20, 997-999 (1995)