A novel polarization-independent wavelength-division-multiplexing filter based on cylindrical microresonators

A novel polarization-independent wavelength-division-multiplexing (WDM) filter, which exploits the strong polarization dependence of cylindrical microresonators by using them as wavelength-selective polarization splitters is presented. Detailed analysis of the polarization dependence of the filter shows that the filter is indeed virtually polarization-independent and has a wavelength response similar to the wavelength response of a microresonator coupled to two waveguides for a single polarization.