A grating-assisted microring resonator for wideband filtering

Chuanqi Fang; Vivek Raj Shrestha; Ikechi Augustine Ukaegbu; Guanghui Ren; Bikash Nakarmi; Shilong Pan

doi:10.1117/12.2618747

8 July 2022 A grating-assisted microring resonator for wideband filtering

Chuanqi Fang, Vivek Raj Shrestha, Ikechi Augustine Ukaegbu, Guanghui Ren, Bikash Nakarmi, Shilong Pan

Proceedings Volume 12283, 2021 International Conference on Optical Instruments and Technology: Micro/Nano Photonics: Materials and Devices; 122830B (2022) https://doi.org/10.1117/12.2618747
Event: 2021 International Conference on Optical Instruments and Technology, 2022, Online Only

Abstract

In this paper, a silicon-based wideband filter with a high sidelobe suppression is proposed. The filer comprises a microring resonator (MRR) with a single ring with a Bragg grating. The Bragg grating in a microring is formed by a subwavelength grating (SWG) waveguide consisting of two gratings of the same period but with different filling-factors to induce variation in refractive index towards the direction of the propagation. The proposed wideband filter using grating-assisted MRR has a 3-dB bandwidth of 1.0734 THz at the passband. A sidelobe suppression of 19.79 dB for passband filtering, low insertion loss of <0.6 dB, a low in-band ripple of less than 0.2 dB are obtained. The proposed scheme uses only one microring; hence, it is compact in size. The proposed filter is a promising candidate for optical communication systems such as coarse wavelength division multiplexing and other wideband applications.

Citation Download Citation

Chuanqi Fang, Vivek Raj Shrestha, Ikechi Augustine Ukaegbu, Guanghui Ren, Bikash Nakarmi, and Shilong Pan "A grating-assisted microring resonator for wideband filtering", Proc. SPIE 12283, 2021 International Conference on Optical Instruments and Technology: Micro/Nano Photonics: Materials and Devices, 122830B (8 July 2022); https://doi.org/10.1117/12.2618747

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KEYWORDS

Waveguides

Optical filters

Bragg gratings

Modulation

Microrings

Refractive index

Terahertz radiation

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