Micro-optic ring resonators are attractive for active and passive micro-optical circuits. Rings and discs with directional couplers have been realized in lateral and vertical geometries [1,2,3]. Coupling of ring resonators with MMI couplers has been demonstrated with ridge-type waveguides on InP [4]. Switching has been demonstrated in active discs using electro-absorption [2]. We report the first demonstration of electro-refractive modulation in ring resonators. MMI couplers are used to provide reproducible coupling ratios, which are particularly important in electro-optic applications or when the resonators are part of an optical filter.

© 2003 Optical Society of America

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