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Complete experimental characterization of stimulated Brillouin scattering in photonic crystal fiber

J.-C. Beugnot, T. Sylvestre, D. Alasia, H. Maillotte, V. Laude, A. Monteville, L. Provino, N. Traynor, S. Foaleng Mafang, and L. Thévenaz

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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 position-resolved 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.

©2007 Optical Society of America

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Figures (6)
Fig. 1.
Fig. 1. Experimental setup for measuring Brillouin threshold and the gain spectra.

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Fig. 2.
Fig. 2. (a) Measured transmitted and backscattered powers as a function of the input pump power. Inset, SEM image of PCF cross section. (b) Brillouin spectrum linewidth as a function of injected pump power. Inset, Brillouin spectrum below threshold (-15dB) using a heterodyne detection with 300 kHz of resolution, FWHM = 80MHz.

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Fig. 3.
Fig. 3. Experimental setup for distributed SBS measurement in PCF. Bottom left : principle of operation of BOTDA technique.

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Fig. 4.
Fig. 4. (a) SBS gain width (FWHM, crosses) and frequency shift (solid line) versus distance with a spatial resolution of 2m. (b) fiber spool, (c) gain spectrum evolution.

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Fig. 5.
Fig. 5. (a) SBS gain width (FWHM, crosses) and frequency shift (solid line) versus distance with a spatial resolution of 10m. (b) evolution of SBS gain spectrum along the fiber.

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Fig. 6.
Fig. 6. Brillouin spectrum at different position along the fiber for a 100ns pulse. The entire sequence can be viewed as a movie attached to the manuscript (avi, 2290 kb). [Media 1]

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