  Photonic integrated circuits (PICs) are a key component [1] for future
telecommunication networks, where demands for greater bandwidth, network
flexibility, low energy consumption and cost must all be met. The quest for all
optical components has naturally targeted materials with extremely large
nonlinearity, including chalcogenide glasses (ChG) [2] and semiconductors, such
as silicon [3] and AlGaAs [4]. Yet issues such as immature fabrication
technologies for ChG, and high linear and nonlinear losses for semiconductors,
motivate the search for other materials. Here we present the first
demonstration of nonlinear optics in integrated silica based glass waveguides
using continuous wave (CW) light. We demonstrate four wave mixing (FWM), with
low (7mW) CW pump power at a wavelength of 1550nm, in high index doped silica
glass ring resonators capable of performing in photonic telecommunications
networks as linear filters [5]. The high reliability, design flexibility, and
manufacturability of our device raises the possibility of a new platform for
future low cost nonlinear all optical PICs.
