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Analysis of Optical Modulator Based on Silicon Waveguide using FDTD

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Abstract

We propose a novel and compact optical modulator based on a silicon microring resonator with a side-coupled circular cavity. The proposed modulator has been numerically and theoretically inspected using the finite-difference time-domain (FDTD) method. To benchmark of the proposed structure, with Firely optimization algorithm, the effect of geometrical parameters to the performance parameters including modulation depth, full with at half the maximum (FWHM), loss, and bandwidth are explored. Then the suitable parameters of an efficient structure are determined in the light of the former studies. The obtained results show that the resonance dips of the modulator have a high transmission quality ratio and that the resonance wavelengths have a reverse relationship with the radius of the in cavity. Also, the numerical results achieved from the transmission spectra are used to analyze the modulation characteristic of the structure. The bandwidth can be tuned to a value as high as 70 GHz with a modulation depth of 58% around the resonance wavelength of 1550 nm and an extinction rate of 18 dB utilizing the novel configuration and by optimizing the structural parameters. Besides, the coupling modulation phase characteristic of the modulator for different input FWHM is also discussed in this paper. The obtained results are compared with other theoretical results and present good agreement. This model can constitute a handy tool for both theoreticians and experimentalists in future research on related topics.

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All data included in this paper are available upon request by contact with the contact corresponding author.

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Acknowledgments

The authors would like to thank the reviewers for their significant comments.

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Authors and Affiliations

  1. Department of Electrical Engineering, University of Larestan, Lar, Iran

    Abdolkarim Afroozeh

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  1. Abdolkarim Afroozeh
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Afroozeh, A. Analysis of Optical Modulator Based on Silicon Waveguide using FDTD. Silicon 14, 839–849 (2022). https://doi.org/10.1007/s12633-020-00883-7

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