Cascaded ring resonator based wide stop-band filter fabricated in AIM photonics technology at Albany Nanotech Complex

M. Rakib Uddin; Jin Wallner; Amit Dikshit; M. Jobayer Hossain; Yukta Timalsina; Nicholas M. Fahrenkopf; David L. Harame

doi:10.1117/12.2649056

17 March 2023 Cascaded ring resonator based wide stop-band filter fabricated in AIM photonics technology at Albany Nanotech Complex

M. Rakib Uddin, Jin Wallner, Amit Dikshit, M. Jobayer Hossain, Yukta Timalsina, Nicholas M. Fahrenkopf, David L. Harame

Author Affiliations +

Proceedings Volume 12424, Integrated Optics: Devices, Materials, and Technologies XXVII; 124240U (2023) https://doi.org/10.1117/12.2649056
Event: SPIE OPTO, 2023, San Francisco, California, United States

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Abstract

In this work, we demonstrate a cascaded ring resonator based wide stop-band filter. The filter consists of four cascaded rings and a bus waveguide. The first ring has a radius of 7μm, the second, third and the fourth rings have radius of 7.01 μm, 7.02 μm, and 7.03 μm, respectively. The radius varion is designed for a small shift of resonant wavelength so that the combined resonance effect of four ring resonators exhibits a wide stop-band filter function compare to a single ring resonator. Both the bus and ring waveguides have a width of 480 nm. The thickness of the waveguides were 220 nm which is a standard silicon-on-insulator (SOI) wafer available in the market. A 100-nm gap is designed between the ring and the bus waveguide to provide optimum filtering. The device is fabricated using the American Institute for Manufacturing integrated Photonics (AIM Photonics) 300mm Multi-Project Wafer (MPW) service. It is tested using the AIM Photonics inline vertical grating coupled automated measurement tool with a tunable light source that has wavelengths ranging from 1485 nm to 1590 nm and a wavelength resolution of 60 pm. The fabricated cascaded ring filter exhibits a 3-dB stop-band about 6 nm wide with an extinction ratio of ~30 dB in across the S, C and L-bands. It is noted that the desired width of the stop-band is achievable by cascading required number of rings with slight radius variation.

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M. Rakib Uddin, Jin Wallner, Amit Dikshit, M. Jobayer Hossain, Yukta Timalsina, Nicholas M. Fahrenkopf, and David L. Harame "Cascaded ring resonator based wide stop-band filter fabricated in AIM photonics technology at Albany Nanotech Complex", Proc. SPIE 12424, Integrated Optics: Devices, Materials, and Technologies XXVII, 124240U (17 March 2023); https://doi.org/10.1117/12.2649056

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