Abstract
The purpose of this study is to design and investigate very compact waveguide with high-performance capabilities. This waveguide consists of a silicon core with a hexagonal photonic crystal structure consisting of air holes. This engineered dispersion structure has a high nonlinearity coefficient, enabling it to simultaneously generate frequency combs and perform their demultiplexing. The small effective mode area of \(\text{0.195}\) μm2 and its large nonlinear coefficient of \(\text{103.}{9}{\text{5}} \, {\mathrm{m}}^{-1}{\mathrm{w}}^{-1}\) are achieved due to the high optical confinement within the core. Frequency combs with adjustable frequency spacing of 5 nm (620 GHz), 1 nm (120 GHz), and 0.2 nm (25 GHz) are generated by injecting two continuous wave laser pumps with powers of 20 w to the initial section of the proposed waveguide with a length of 4 mm. In the second stage of the waveguide, the demultiplexing process is accomplished by propagating these combs, effectively separating five distinct comb lines with a wavelength spacing of 1 nm. It is possible to create resonance in the second part of the structure, which is a continuation of the first part, and as a result, separate the comb lines. As a result, this part of the waveguide has the average transmission efficiency, Q factor, spectral line width, and channel spacing, which are approximately 98.08%, 6863.6, 0.222 nm, and 1 nm, respectively. The proposed structure is suitable for optical integrated circuits and in applications that require simultaneous information transmission due to its great compactness.
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This work was supported by Shahid Rajaee Teacher Training University under Grant No. 4975.
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Alizadeh, M.R., Olyaee, S. & Seifouri, M. Designing and analyzing an ultra-compact dual-purpose SOI waveguide with photonic crystal structure for efficient generation and demultiplexing of frequency combs. Opt Quant Electron 55, 907 (2023). https://doi.org/10.1007/s11082-023-05179-9
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DOI: https://doi.org/10.1007/s11082-023-05179-9