Angle-Tuned Filters From Cholesteric Liquid-Crystal Intended for Visible Wavelength- Division Multiplexing
Résumé
This letter describes the development of notch filters and dichroic beam-splitters intended for short-haul links based on wavelength division multiplexing over poly-methylmethacrylate polymer optical fibers. The filter was built using two cholesteric liquid crystal (CLC) cells configured in reflection mode where the incident light is reflected twice, by the first and the second CLC. The filter reflection is greater than 80% for the desired wavelengths and it is polarization insensitive.