  Frequency modulation of a continuous wave laser source enables generation of
photons at multiple frequencies from a single pump laser. Such multiple closely
spaced laser lines are important for high data rate QAM in dense-WDM networks.
In this paper we present a monolithic silicon acousto-optic frequency modulator
(AOFM) operating at 1.09GHz. We demonstrate frequency modulation of a 1564nm
wavelength pump laser, resulting in generation of sideband laser lines spaced
by 0.009nm.
