Forward Brillouin scattering in dual-mode optical fibre


Russell, P.St.J. and Pannell, C.N. (1991) Forward Brillouin scattering in dual-mode optical fibre. In, Optical Society of America Annual Meeting, San Jose, US, 03 - 08 Nov 1991.

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Description/Abstract

Forward stimulated Brillouin scattering (FSBS) is similar in physical origin to conventional backward SBS (BSBS) except that it occurs in a forward direction between two nondegenerate copropagating optical modes of a dual-mode optical fiber. FSBS may, however, be the only example of a nonlinear effect where the threshold falls as the mode spot size is increased. This curious behavior is a consequence of the fact that the acoustic gain depends on an electrostrictive moment and not (as in conventional SBS) a pressure. Intermodal beating between an LP mode gives rise to a moving interference pattern with regions of constructive interference that alternate across the core. In the correct matching conditions. electrostriction will feed optical energy into a flexural mode of the fiber. The results of a theoretical study of FSBS are presented. including calculations of the threshold power (only weakly dependent on the laser linewidth. owing to the copropagating nature of the process) with a discussion of the novel phenomenology caused by long phonon lifetimes. We also show how the theory may be used to design special fibers in which the FSBS threshold power is many times smaller than in BSBS.

Item Type: Conference or Workshop Item (Paper)
Related URLs:
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: University Structure - Pre August 2011 > Optoelectronics Research Centre
Faculty of Physical Sciences and Engineering > Optoelectronics Research Centre
ePrint ID: 77400
Date Deposited: 11 Mar 2010
Last Modified: 27 Mar 2014 18:57
URI: http://eprints.soton.ac.uk/id/eprint/77400

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