Abstract
The effect of hypersonic diffraction in single mode fibers was discussed in Ref. 1. It was shown that the hypersound experiences a diffraction smearing at the length Ldif ~ D2/λs comparable to the hypersound relaxation length LR ~ v/Γ (where D is the fiber core diameter, λs is the hypersound wavelength, v is the hypersound velocity, and T is the bandwidth of spontaneous scattering). This leads to a shift of the Stokes frequency, Stokes spectrum broadening, and decrease in the SBS gain factor gSBS.
© 1996 Optical Society of America
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