Abstract

We propose a new type of optical waveguide that consists of a sequence of coupled high-Q resonators. Unlike other types of optical waveguide, waveguiding in the coupled-resonator optical waveguide (CROW) is achieved through weak coupling between otherwise localized high-Q optical cavities. Employing a formalism similar to the tight-binding method in solid-state physics, we obtain the relations for the dispersion and the group velocity of the photonic band of the CROW’s and find that they are solely characterized by coupling factor κ1. We also demonstrate the possibility of highly efficient nonlinear optical frequency conversion and perfect transmission through bends in CROW’s.

© 1999 Optical Society of America

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