Abstract
Recently, stimulated Brillouin scattering in a forward direction (FSBS) in a dual-mode single-core optical fiber was reported by the authors (see Electron Lett., vol.26 p.1195-6, 1990). Frequency shifts on the order of 17 MHz were seen in fiber supporting LP/sub 01/ and LP/sub 11/ modes at 514.5 nm. The phenomenon is examined in detail, and the governing differential equations of the three-wave parametric process, (involving laser pump, Brillouin signal, and acoustic flexural-wave phonon) are derived and solved. FSBS is possible because although the overlap integral between a flexural fiber mode and the light is small, the phonon lifetime is much longer than in conventional stimulated Brillouin scattering (SBS). FSBS may also be the first example of a nonlinear effect which is enhanced by increasing the optical model area at constant pump power.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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