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Forward Brillouin scattering in dual-mode optical fibre

Forward Brillouin scattering in dual-mode optical fibre
Forward Brillouin scattering in dual-mode optical fibre
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.
Russell, P.St.J.
77db5e8d-8223-4806-ae60-a106619a022a
Pannell, C.N.
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Russell, P.St.J.
77db5e8d-8223-4806-ae60-a106619a022a
Pannell, C.N.
002fadf4-f97e-4732-b171-73ed7563ee18

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

Record type: Conference or Workshop Item (Paper)

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.

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Published date: 1991
Venue - Dates: Optical Society of America Annual Meeting, , San Jose City, United States, 1991-11-03 - 1991-11-08

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Local EPrints ID: 77400
URI: http://eprints.soton.ac.uk/id/eprint/77400
PURE UUID: 298e112f-0f8a-44c5-926b-eb456183bde5

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Date deposited: 11 Mar 2010
Last modified: 10 Dec 2021 17:14

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Contributors

Author: P.St.J. Russell
Author: C.N. Pannell

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