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Brillouin scattering spectrum in photonic crystal fiber with a partially germanium-doped core

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Abstract

The Brillouin scattering spectrum in a photonic crystal fiber (PCF) with a partially Ge-doped core is measured with a pump–probe technique at a wavelength of 1320 nm. One main peak and four subpeaks are observed. The main peak has a Lorentzian shape with the bandwidth ΔνB=66 MHz. Its intensity is six times higher than that from a standard single-mode fiber measured under the same conditions, which is consistent with the ratio of 1/AeffPCF/1/AeffSMF, where Aeff is the effective area of the fibers. The temperature coefficient for the main peak is 0.96 MHz/°C. We believe that the subpeaks are caused by an interaction between light-wave and guided modes of longitudinal acoustic waves in the graded-Ge-doped region, the silica region, and the microstructured cladding. An analysis of the guiding and antiguiding properties of the PCF for acoustic waves is presented.

© 2003 Optical Society of America

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