Recent development on silica waveguide technology for integrated optics

Silica waveguide technologies have been developed based on a combination of the flame hydrolysis deposition and reactive ion etching, which have the advantage of structure controllability and reproducibility of integrated circuits. The bonding technology using UV adhesive and the mold packaging technology have been developed. Silica waveguide integrated devices such as 1 by N, 2 by N and N by N, polarization maintaining splitters, wavelength division multi/demultiplexers, frequency division multi/demultiplexers, dense WDMs, and optical switching devices can be commercially produced with these technologies.