Title :
Theory of forward stimulated Brillouin scattering in dual-mode single-core fibers
Author :
Russell, P.St.J. ; Culverhouse, D. ; Farahi, F.
Author_Institution :
Phys. Lab., Kent Univ., Canterbury, UK
fDate :
3/1/1991 12:00:00 AM
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 LP01 and LP 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
Keywords :
fibre optics; stimulated Brillouin scattering; 514.5 nm; Brillouin signal; acoustic flexural-wave phonon; dual-mode single-core fibers; flexural fiber mode; forward stimulated Brillouin scattering; frequency shifts; governing differential equations; involving laser pump; nonlinear effect; optical model area; overlap integral; phonon lifetime; three-wave parametric process; Brillouin scattering; Differential equations; Electrons; Fiber lasers; Frequency; Laser modes; Optical fiber theory; Optical fibers; Phonons; Pump lasers;
Journal_Title :
Quantum Electronics, IEEE Journal of