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4 March 2019 Silicon photonics dual-coupler nested coupled cavities
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Proceedings Volume 10923, Silicon Photonics XIV; 109231P (2019)
Event: SPIE OPTO, 2019, San Francisco, California, United States
In this work, we present the realization of a novel configuration of dual-coupler nested coupled ring resonator on silicon photonics technology. The waveguide height and width are 220 nm and 500 nm, respectively, surrounded by air from the top and by silicon-oxide on the three other sides. The design assumes TM mode with group refractive index of 3.17 at 1550 nm. The design consists of two mini-racetrack resonators of the smallest lengths of 150.8 and 182.13 μm corresponding to resonance, and bending radius of 25 μm, to minimize bending losses. The directional couplers are designed for a coupling ratio of 97/3. The proposed configuration and the single cavity ring resonator are fabricated using IMEC- ePIXfab passive technology. The measured response shows that the new configuration enhances the finesse by up to 10 times. The proposed high finesse resonator can boost the performance in many applications such as gas sensing, rotation sensing and optical filters.
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Rabab A. Shalaby, Mahmoud A. Selim, George A. Adib, Yasser M. Sabry, Michael Gad, and Diaa Khalil "Silicon photonics dual-coupler nested coupled cavities", Proc. SPIE 10923, Silicon Photonics XIV, 109231P (4 March 2019);

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