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Resonance Enhancement in Silicon-on-Insulator-Based Two-Ring Mach–Zehnder Interferometer

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5 Author(s)
Darmawan, S. ; Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore ; Landobasa, Y.M. ; Dumon, P. ; Baets, R.
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We propose and demonstrate a two-ring coupled Mach-Zehnder interferometer (2RMZI) device that exhibits a sharp resonance with background suppression to give both high finesse and modulation depth. The combination of MZI and the two-ring structure leads to more complete destructive interference that effectively removes the unwanted background envelope effect found in the transmission spectrum of a simple two-ring-two-bus (2R2B) system. The projected finesse enhancement of 2RMZI relative to one-ring coupled MZI and 2R2B is discussed based on best-fit parameter values that match the fabricated devices.

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Photonics Technology Letters, IEEE  (Volume:20 ,  Issue: 18 )