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Cascaded microring resonators for crosstalk reduction and spectrum cleanup in add-drop filters

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5 Author(s)
Sai Tak Chu ; Kanagawa Acad. of Sci. & Technol., Japan ; Little, B.E. ; Wugen Pan ; Kaneko, T.
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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.

Published in:

Photonics Technology Letters, IEEE  (Volume:11 ,  Issue: 11 )