Theory of stimulated Raman scattering in two-mode optical fibers

Abstract

In a series of recent experiments investigating stimulated Raman scattering (SRS) in a multimode fiber, the evolution of the Stokes wave in the low-order modes was studied. In this paper we investigate the theory of SRS in a two-mode optical fiber in order to analyze the behavior of the Stokes modes under different pump and excitation conditions. We find that when the participating waves are phase matched a subtle nonlinear interaction occurs between the pump and Stokes modes. This interaction does not involve the stimulated four-photon mixing process. We also suggest a potential loss mechanism that is due to the scattering of Stokes light into higher-order leaky modes.

© 1993 Optical Society of America