Wavelength division multiplexed add/drop ring technology in corporate backbone networks

The Corporate Optical Backbone Network (COBNET) project is a joint research project within the ACTS program of the European Commission. The COBNET con sortium is considering the use of advanced optical networking technologies for the backbones of future corporate networks. In particular, multichannel add/drop ring networks based on wavelength division multiplexing (WDM) as well as on optical space-division multiplexing (SDM) technologies are being pursued. An overview is given of the system concept, the device technology , and the demonstration network that was developed within COBNET. The WDM r ing option and specifically the related add/drop devices are focused on in more detail. These devices are fabricated in a newly developed high-refract ive-index contrast planar silica-on-silicon technology by using silicon-oxy nitride (SiON) as the core waveguide material. Compact add/drop components based on the resonant coupler concept are realized. The filter characterist ic can be tailored and tuned by thermo-optic heaters, which enables the sel ection of any given wavelength out of a series of wavelengths from the WDM ring using the same device, (C) 1998 Society of Photo-Optical Instrumentati on Engineers. [S0091-3286(98)00512-1].