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Can the Speed of Light in the Fiber be Controlled
STANFORD UNIV CA SPACE TELECOMMUNICATIONS AND RADIOSCIENCE LAB (STAR)
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Nonlinear effects in optical fibers lead to many interesting phenomena, including nonlinear wave coupling, optical pulse compression, stimulated Raman and Brillouin scattering, harmonic generation, optical solitons etc. Solitons have been known to applied scientists for some 20 years see for example 1. In this work we predict that a nonlinear interaction between two copropagating modes and an acoustical wave in dual mode optical fibers can lead to a three-wave envelope soliton TWES and controlling the speed of light in the fiber. To generate TWES, two light copropagating waves with slightly different frequencies have to be synchronously modulated and launched into the fiber as shown in Figure 1 the acoustical wave is generated in the fiber by nonlinear coupling with intermodal beating. The same second order nonlinearity is responsible for this process, it is similar to the stimulated forward Brillouin scattering 2 TWESs are similar to conventional optical solitons 3 in the sense that they are envelope solitons. However, unlike conventional optical solitons, TWES is a nonlinear combination of three waves 4.
APPROVED FOR PUBLIC RELEASE