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An eight-channel add-drop filter using vertically coupled microring resonators over a cross grid

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6 Author(s)
Chu, S.T. ; 3-D Microphotonics Project, Kanagawa Acad. of Sci. & Technol., Kawasaki, Japan ; Little, B.E. ; Pan, W. ; Kaneko, T.
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An eight-channel add-drop cross-grid vertically coupled microring resonator (VCMRR) filter is proposed and demonstrated. The cross grid comprises a grid-like array of buried channel waveguides which perpendicularly cross through each other, VCMRRs at each of the cross-grid nodes serve as the wavelength selective add-drop filters. Measured crosstalk levels at the crossings are typically less than -30 dB. Rings with a nominal radius of 10 μm are used to achieve a free-spectral range of 20 nm and optical bandwidths of 1 nm, while changes of the radii in increments of 50 nm lead to a nominal channel spacing of 5.7 nm.

Published in:

Photonics Technology Letters, IEEE  (Volume:11 ,  Issue: 6 )