Abstract

Polarization-decoupled four-wave mixing (FWM) based on stimulated Brillouin scattering (SBS) in a polarization-maintaining fiber is studied both theoretically and experimentally. We show the difference between Brillouin-enhanced FWM, which was studied a long time ago, and the Brillouin dynamic grating that was proposed in recent years. Under undepleted pump approximation, an analytical solution is given for the coupled equations, showing that a net phase-matching condition is dependent on pump power and frequency detuning from the Brillouin frequency. Experimental investigation of this net phase-matching condition provides a method to measure the spectral change in the refractive index that is responsible for the slow light effect based on SBS. Small refractive index changes (on the order of 108) versus frequency detuning can be determined experimentally.

© 2013 Optical Society of America

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