Thermally tunable high-order microring filters with large free-spectral-range

Jiamei Gu; Zhaoyu Wang; Xin Chen; Xiao Ma; Mingyu Li; Jianjun He

doi:10.1117/12.3000512

21 December 2023 Thermally tunable high-order microring filters with large free-spectral-range

Jiamei Gu, Zhaoyu Wang, Xin Chen, Xiao Ma, Mingyu Li, Jianjun He

Proceedings Volume 12966, AOPC 2023: AI in Optics and Photonics ; 1296603 (2023) https://doi.org/10.1117/12.3000512
Event: Applied Optics and Photonics China 2023 (AOPC2023), 2023, Beijing, China

Abstract

We propose a high-order microring filter structure based on the Silicon-On-Insulator (SOI) platform for flattening filtering. This filter structure can achieve a box-like spectral response with large free-spectral-range (FSR) and high out-of-band extinction ratio (ER), which can be widely used in various fields, especially in the wavelength division multiplexing. The filter consists of two or more rings which are connected in series, with Ti electrodes added on them for thermal tuning. According to the proposed requirements of spectral bandwidth and FSR, the physical dimensions of the high-order microring filter structure can be calculated based on theoretical formulas, and we optimize them for better performance. The relationship of the coupling coefficients of each coupling zone is calculated based on the Butterworth spectral responses. Result shows that the higher-order filter has steeper rise-fall edges and a flatter top, and can be designed to achieve a larger FSR. The FSR of the fourth-order microring filter can be designed to 78.4 nm, with ER of 12.6 dB, and the insertion loss of 1.1 dB. The fluctuations at the top of the box-like spectra caused by the fabrication deviations can be compensated by applying voltages to Ti electrodes, which can change the effective refractive index of the waveguide.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Jiamei Gu, Zhaoyu Wang, Xin Chen, Xiao Ma, Mingyu Li, and Jianjun He "Thermally tunable high-order microring filters with large free-spectral-range", Proc. SPIE 12966, AOPC 2023: AI in Optics and Photonics , 1296603 (21 December 2023); https://doi.org/10.1117/12.3000512

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KEYWORDS

Tunable filters

Microrings

Optical filters

Refractive index

Waveguides

Electrodes

Wavelength division multiplexing

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