Abstract

We demonstrate a simple configuration for generating a double Brillouin frequency shift through the circulation of an odd-order Brillouin Stokes signal. It is operated based on cascaded Brillouin scattering in single-mode optical fibers that behave as the Brillouin gain media. A four-port circulator is incorporated into the setup to circulate the odd-order Brillouin Stokes signal in the fiber. It thus initiates a higher order Brillouin Stokes signal, which is double Brillouin frequency downshifted from the input signal. For the 5km long fiber, the Brillouin pump power at 23mW gives a clean output spectrum with 30dB sideband suppression ratio. The output signal is 0.174nm or 21.7GHz downshifted from the input signal.

© 2010 Optical Society of America

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