  We show operation of a silicon MEMS based narrow-band optical modulator with
large modulation depth by improving the electro-mechanical transducer. We
demonstrate an application of the narrowband optical modulator as both the
filter and optical modulator in an opto-electronic oscillator loop to obtain a
236.22 MHz Opto-Acoustic Oscillator (OAO) with phase noise of -68 dBc/Hz at 1
kHz offset.
