Abstract

Brillouin-gain spectra are measured for pure-silica core, GeO2-doped core, and P2O5-doped core single-mode fibers with different index profiles. A narrow-linewidth semiconductor laser operating at 828 nm is used as the pump light source. The spectral shape of the Brillouin gain is found to be strongly related to the refractive-index profiles. The Brillouin linewidths evaluated experimentally are 90 and 215 MHz for a step-index single-mode fiber and a graded-index single-mode fiber, respectively. The Brillouin Stokes shifts depend on the core/cladding dopant materials and their concentrations and range from 20 GHz for the P2O5-doped core fiber to 21.6 GHz for the pure-silica core fiber in the 0.8-μm-wavelength region.

© 1987 Optical Society of America

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