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In addition, as shown in Figure 6B, by combining the similar curved waveguides with the slot waveguide, the TE extinction ratio is greater than 30dB, which is the first high-performance silicon-based splitter operating in the 2μm band [ 127]. Digital optical cable splitters are a great addition to your audio setup, especially if you have multiple audio devices.
Methods and applications of on-chip beam splitting: A review
It is found that the polarization insensitivity can be achieved by improving the classical MMI coupler. For the polarization beam splitting, the multimode waveguide of MMI coupler is often specially designed to allow only one mode to pass through and the other mode to cut off. In: 2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC); 2019 July 07’11; Fukuoka, Japan. Figure reproduced with permission from: (A), © 2014, Institute of Electrical and Electronics Engineers (IEEE); (B), © 2019, Institute of Electrical and Electronics Engineers (IEEE); (C), © 2019, Institute of Electrical and Electronics Engineers (IEEE). Different from the above three traditional design methods of micro nano structures, the methods using concept of inverse design often deduces the corresponding structural parameters from the performance indicators of devices, which can not only realize the optimal design of devices, but also use programmable methods to design silicon-based optoelectronic devices with adjustable functions.A compact silicon-based polarization-independent power splitter using a three-guide directional coupler with subwavelength gratings. In the paper [ 143], Chen Kaixuan proposed using 3dB splitter and optical switch to simultaneously control and route multiple modes, which is of great significance in simplifying network system routing, sharing switch resources, reducing power consumption and reducing size. Since SWG can increase the degree of freedom of waveguide design, effectively reduce the footprint of waveguide devices, and realize the low loss coupling between single-mode fiber and waveguide. Optimization of ultracompact polarization-insensitive multimode interference couplers based on Si nanowire waveguides.
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On the one hand, for an independent MMI coupler, the effective refractive index of TE and TM modes can be changed depending on the special design of multimode structure, so that the coupling intensity of the two modes is equal, so as to realize polarization insensitivity. Figure reproduced with permission from: (A), © 2011, Optical Society of America (OSA); (B), © 2021, Optical Society of America (OSA); (C), © 2020, Optical Society of America (OSA).
Silicon polarization beam splitter at the 2 μm wavelength band by using a bent directional coupler assisted with a nano-slot waveguide.
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