Abstract
In this paper we design, simulate, and analyze single-mode microring resonators in thin films of z-cut lithium tantalate. They operate at wavelengths that are approximately equal to 1.55 μm. The single-mode conditions and transmission losses of lithium tantalate waveguides are simulated for different geometric parameters and silica thicknesses. An analysis is presented on the quality factor and free spectral range of the microring resonators in lithium tantalate at contrasting radii and gap sizes. The electro-optical modulation performance is analyzed for microring resonators with a radius of 20 μm. Since they have important practical applications, the filtering characteristics of the microring resonators that contain two straight waveguides are analyzed. This work enhances the knowledge of lithium tantalate microring structures and offers guidance on the salient parameters for the fabrication of highly efficient multifunctional photonic integrated devices, such as tunable filters and modulators.
Highlights
An essential component in the construction of high-density photonic integrated circuits is an optical microring resonator
The microring resonators are widely employed in the design and manufacture of optical filters [4,5,6], modulators [7,8], optical switches [9,10], optical delay lines [11], and Kerr frequency combs [12,13,14,15], etc
Lithium tantalate on insulator (LTOI) is increasingly favored as the material of choice for integrated electro-optic and surface acoustic wave (SAW) devices [30,31,32]. This is because of its high-index contrast—which leads to a robust light guidance and a high-performance integrated device with a small footprint—that is suitable for microring resonators
Summary
An essential component in the construction of high-density photonic integrated circuits is an optical microring resonator This is due to its compact size, simple structure and outstanding wavelength-selective properties [1,2,3]. Lithium tantalate on insulator (LTOI) is increasingly favored as the material of choice for integrated electro-optic and SAW devices [30,31,32]. This is because of its high-index contrast—which leads to a robust light guidance and a high-performance integrated device with a small footprint—that is suitable for microring resonators. The thickness of the LT film is set to 0.5 μm to ensure the single-mode condition in the simulation
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