Abstract

In this paper, a novel technique to set the coupling constant between cells of a coupled resonator optical waveguide (CROW) device, in order to tailor the filter response, is presented. The technique is demonstrated by simulation assuming a racetrack ring resonator geometry. It consists on changing the effective length of the coupling section by applying a longitudinal offset between the resonators. On the contrary, the conventional techniques are based in the transversal change of the distance between the ring resonators, in steps that are commonly below the current fabrication resolution step (nm scale), leading to strong restrictions in the designs. The proposed longitudinal offset technique allows a more precise control of the coupling and presents an increased robustness against the fabrication limitations, since the needed resolution step is two orders of magnitude higher. Both techniques are compared in terms of the transmission esponse of CROW devices, under finite fabrication resolution steps.

© 2009 Optical Society of America

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History
Original Manuscript: September 22, 2009
Manuscript Accepted: October 24, 2009
Revised Manuscript: October 23, 2009
Published: November 4, 2009

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Author Affiliations

Jose D. Domenech, Pascual Muñoz, Jose Capmany

Universidad Politecnica de Valencia / OQCG

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