Figure 1| Forward Brillouin Scattering in Few-Mode Fibers. (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Figure 1| Forward Brillouin Scattering in Few-Mode Fibers.

Caption

Figure 1| Forward Brillouin Scattering in Few-Mode Fibers. (a) Guided ultrasonic, mechanical modes of standard fibers. The images show the calculated profiles of material displacement in the radial direction. Left: radially symmetric mode. Center: first-order azimuthal symmetry. Right: Two-fold azimuthal symmetry. Only the radially symmetric modes and the two-fold symmetric ones are accessible through Brillouin scattering processes in single-mode fibers, whereas first-order symmetric modes are not. (b) Measured spectrum of forwards Brillouin scattering through high order mode LP02 of a few-mode fiber. The spectrum extends up to 1.8 GHz, about three times higher than in single-mode fibers. (c) Measured and calculated spectral of acoustic modes of first-order azimuthal symmetry, observed for the first time in the few-mode fiber. (d) Frequency detuning of stimulated acoustic modes above their cut-off values in a few-mode fiber. In single-mode fibers, these modes may only be generated exactly on cut-off.

Credit

Elad Layosh et al.

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