A novel frequency-doubling Brillouin optoelectronic oscillator

An optically tunable frequency-doubling Brillouin optoelectronic-oscillator using a dual-electrode Mach-Zehnder modulator (DEMZM) is presented. To achieve frequency-doubling, the DEMZM is biased at the maximum transmission point and only one of its electrodes is driven by the oscillation signal, whose frequency is determined by the stimulated Brillouin scattering effect in a high nonlinear dispersion-shifted fiber. Frequency tunability is obtained by utilizing the wavelength-dependent Brillouin frequency shift. Frequency-doubling microwave signals from 18.38 to 18.74 GHz with large suppression of the fundamental frequency component are generated. The proposed approach features low cost and simple in structure.