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Optimization and Comparative Analysis of Rectangular and Slot Waveguide based Symmetric Ring and Racetrack Resonators for SoI Photonic Integrated Filters

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Abstract

Over the past decades Silicon on Insulator (SoI) technology has tantalized the interest of researchers in the design of numerous nonlinear Photonic Integrated Circuits (PIC’s) to provide a variety of devices. In this manuscript, four different types of optical add/drop resonators are proposed and compared using their simulated microcomb notch filter performance. The four types of resonators are (i) rectangular waveguide based conventional ring resonator, (ii) slot waveguide based ring resonator, (iii) rectangular waveguide based racetrack resonator, and (iv) slot waveguide based racetrack resonator, for variety of active/passive applications. The resonator parameters: Free Spectral Range (FSR), Full Width at Half Maximum (FWHM), Finesse (F) and Quality factor (Q-factor) are evaluated and compared for four resonators. The resonators are optimized for different parameters, such as ring radius (R), gap (g) between the waveguides and coupling length (Lc). The optimized R of ~ 30 μm with the power coupled ‘g’ of 55 nm is found after performing rigorous simulations for the entire optical conventional band (C-band) i.e., in 1530 nm – 1565 nm using Finite Element Method (FEM). The manuscript provides valuable insights into the design considerations and performance trade-offs of different optical resonators in PICs showing symmetricity along x-axis and y-axis. These findings can guide the development of efficient and high-performance integrated photonic devices for various applications, including communication and computing systems.

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Data Availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors would like to acknowledge Indian Science Technology and Engineering facilities Map (I-STEM) for providing software license support of COMSOL Multiphysics 6.0 used to carry out this work. This work has been carried out in the Department of Electronics and Communication Engineering at Netaji Subhas University of Technology, Delhi.

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  1. Department of Electronic and Communication Engineering, Netaji Subhas University of Technology, Delhi, 110078, India

    Shalini Vardhan & Ritu Raj Singh

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  1. Shalini Vardhan
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Contributions

Shalini Vardhan: Performed simulations, Data collection, Data curation, Writing - Original draft. Ritu Raj Singh: Conceptualization, Review and Editing.

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Correspondence to Ritu Raj Singh.

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Vardhan, S., Singh, R.R. Optimization and Comparative Analysis of Rectangular and Slot Waveguide based Symmetric Ring and Racetrack Resonators for SoI Photonic Integrated Filters. Silicon 16, 2913–2926 (2024). https://doi.org/10.1007/s12633-024-02879-z

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