Thin film optical filter: an enabling technology for modern optical communication systems

Thin film dense wavelength division multiplexing (DWDM) filter is one of the most widely used filtration technologies that made possible the technical advancement of modern optical communication systems. A brief introduction to the thin film DWDM filter technology will be presented. The recent progress in thin film DWDM technology will be reviewed. Applications demonstrating the DWDM filter as an enabling technology for modern optical communication systems will be reviewed in detail.