Abstract:We provide a complete experimental characterization of stimulated Brillouin scattering in a 160 m long solid-core photonic crystal fiber, including threshold and spectrum measurements as well as positionresolved mapping of the Brillouin frequency shift. In particular, a three-fold increase of the Brillouin threshold power is observed, in excellent agreement with the spectrally-broadened Brillouin gain spectrum. Distributed measurements additionally reveal that the rise of the Brillouin threshold results from the broadband nature of the gain spectrum all along the fiber and is strongly influenced by strain. Our experiments confirm that these unique fibers can be exploited for the passive control or the suppression of Brillouin scattering. Brillouin shift along single-mode optical fibres," Opt. Lett. 4, 1128Lett. 4, -1130Lett. 4, (2004. 11. R. Tkach, A. R. Chraplyvy and R. M. Derosier, "Spontaneous Brillouin scattering for single-mode optical fiber characterization," Electron. Lett. 22, 1011Lett. 22, -1012Lett. 22, (1986. 12. P. Bayvel and P. M. Radmore "Solutions of the SBS equations in single mode optical fibers and implications for fiber transmission systems," Electron. Lett. 26, 434-435 (1990). 13. R. G. Smith, "Optical power handling capacity of low loss optical fibers as determined by stimulated Raman and Brillouin scattering," Appl. Opt. 11, 2489-2494 (1972

Modulation instability can limit the resolution and the range of distributed fibre sensors based on stimulated Brillouin scattering. In this paper we analyse this process and suggest adequate methods to overcome it.

Injection locking of two DFB semiconductors opens new possibilities to generate effective signals for optical sensing, in order to reach better performances. Pure wave forms can be generated with qualities exceeding those obtained using external modulators. This is illustrated through the application to the distributed Brillouin sensing that shows significant progress with respect to established techniques.

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