Optimized coupler design for slot waveguide ring resonators

Strain, Michael John M.J. and Sorel, Marc M. (2014) Optimized coupler design for slot waveguide ring resonators. IEEE Photonics Technology Letters, 26 (3). pp. 224-226. ISSN 1041-1135

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Abstract

The highly sensitive nature of slot waveguide micro-resonator power couplers is discussed with respect to the resonator geometry and evanescent coupler design. A modified, tri-bar, evanescent field coupler is demonstrated that shows reduced sensitivity to ring radius as compared with conventional couplers, while maintaining a compact beat-length of only a few micrometers. With the measurement of bending losses of curved slot waveguides, critically coupled ring resonators were designed and fabricated, exhibiting a resonance extinction exceeding 22 dB.