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Optimized Coupler Design for Slot Waveguide Ring Resonators

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2 Author(s)
Strain, M.J. ; Inst. of Photonics, Univ. of Strathclyde, Glasgow, UK ; Sorel, M.

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.

Published in:

Photonics Technology Letters, IEEE  (Volume:26 ,  Issue: 3 )