Title :
Cascaded microring resonators for crosstalk reduction and spectrum cleanup in add-drop filters
Author :
Sai Tak Chu ; Little, B.E. ; Wugen Pan ; Kaneko, T. ; Kokubun, Y.
Author_Institution :
Kanagawa Acad. of Sci. & Technol., Japan
Abstract :
The role of cascaded filters for spectrum cleanup and crosstalk reduction in add-drop filters is addressed experimentally for microring resonator cross-grid technology. The fabricated devices consist of glass microring resonators 10 μm in radius vertically integrated above a cross-grid waveguide array. Sharper linewidth rolloff and flattened passband responses are observed. The ratio of 15 to 3 dB bandwidth of a cascaded double filter is reduced by a factor of 3 compared with the single-filter case. Because of the very small dimensions of the resonators, the use of multiple filters to improve the spectral response consumes negligible chip space.
Keywords :
integrated optics; interference suppression; optical arrays; optical communication equipment; optical crosstalk; optical filters; optical resonators; add-drop filters; cascaded double filter; cascaded microring resonators; cross-grid technology; cross-grid waveguide array; crosstalk reduction; linewidth rolloff; multiple filters; passband responses; spectral response; spectrum cleanup; Band pass filters; Crosstalk; Glass; Optical filters; Optical resonators; Optical ring resonators; Optical waveguides; Resonator filters; Throughput; WDM networks;
Journal_Title :
Photonics Technology Letters, IEEE
