Abstract

We propose and demonstrate a novel method to measure the nonlinear parameter of an optical fiber by characterizing the evolution of self-phase modulation (SPM) based on Brillouin optical time-domain analysis (BOTDA). BOTDA uses an ns-order pump pulse to provide the evolution of the Brillouin gain spectrum (BGS) over an optical fiber, which is the convolution of the intrinsic BGS and the pulse spectrum, subsequently reflecting the pulse spectrum broadening induced by SPM. An experiment is carried out with a 2 km standard single-mode fiber using a 9.72 ns Gaussian pump pulse, and the nonlinear parameter is measured to be $2.03{\mathrm{W}}^{-1}{\mathrm{km}}^{-1}$ through comparing simulations with measured Brillouin spectra for nonlinear phase shifts of $1.5\pi$ and $2.5\pi$, which agrees well with previously reported results.

© 2016 Optical Society of America

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