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As shown in Figure 8B, the state of the d-mode quantum controlled splitter determines the delay selection. When choosing a splitter, consider the number of output ports, compatibility with your devices, and the quality of the connectors. However, the y-branch power splitter of traditional waveguide is limited by the radiation loss at the branch angle, resulting in the large transverse size of the device. Nowadays, several classical structures used for on-chip beam splitting mainly include y-branch waveguide [ 35– 51], splitters based on multimode interference (MMI) coupling [ 52– 69], splitters based on directional coupling (DC) [ 70– 75], and splitters based on inverse design [ 76– 81]. The best splitters are engineered to prevent signal loss, ensuring that each output device receives a clear, high-quality audio signal.
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Compact and broadband silicon-based transverse electric-pass power splitter using triple-guide directional couplers with hybrid plasmonic waveguides and 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.All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers.
Methods and applications of on-chip beam splitting: A review
Broadband mode router based on three-dimensional Mach-Zehnder interferometer and waveguide branches. to connect the MDF (main distribution frame) and the terminal equipment and to branch the optical signal. The splitter is robust and durable, made with a 24K gold connector, low-jitter fiber, and low-loss fiber optic to provide the best possible sound quality.As one of the most basic integrated optical devices, the y-branch waveguide is composed of one input waveguide and two output waveguides, which can confine photons to the y waveguide for distribution and propogation.
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The y-branch has achieved 1 × 256 [ 40] splitters, which is of great significance for the efficient utilization of sources and large-scale photonic integrated chips. Cheng L, Mao S, Mu X, Wu S, Fu HY, Dual-wavelength-band multiplexed grating coupler on multilayer SiN-on-SOI photonic integrated platform.The micro ring structure with directional coupling beam splitter can be used not only for optical modulation, but also for micro ring filter [ 147] and micro ring switch array. Broadband 2 × 2 adiabatic 3 dB coupler using silicon-on-insulator sub-wavelength grating waveguides. The multimode quantum system thus constructed provides a multi-functional platform for the study of multimode quantum superposition and coherence, and also provides in-depth insights into the benchmark controllability of multi-dimensional quantum physics and integrated optical quantum technology. To realize multi-channel power beam splitting, it can be combined with slot waveguide to determine the coupling length and waveguide gap, so as to realize four-channel power output [ 73]. For example, the device shown in Figure 1B, the birefringent material“Reactive Mesogen (RM)” is inserted into a y-branch optical waveguide to extract the TE polarized mode.
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For the special design of multimode region, there are mainly two methods: introducing SWG and introducing shallow etching region.Firstly, the basic principles of four beam splitting methods are introduced; Secondly, the design methods of beam splitter based on y-branch, MMI coupling, DC and inverse design algorithm are introduced. A compact silicon-based polarization-independent power splitter using a three-guide directional coupler with subwavelength gratings. In recent years, for different separation characteristics, a number of improved designs for multimode waveguides have emerged, which can efficiently realize the functions of power beam splitting [ 60– 67], polarization beam splitting [ 52– 59], wavelength division multiplexing (WDM) [ 110– 114], mode division multiplexing (MDM) [ 68, 115, 116], and the power splitter based on MMI coupling is easy to realize polarization-insensitive design. 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. Different from the above design methods based on traditional structures, the concept of inverse design has also been widely used in the design of silicon-based optoelectronic devices in recent years.
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