Design and simulation of 4-mode (de)multiplexers implemented in conventional and subwavelength grating Si/SiO2 platforms

Methods and applications of on-chip beam splitting: A review

“…According to the general design principle, it can realize multi inputs and multi outputs distribution. 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][61][62][63][64][65][66][67], polarization beam splitting [52][53][54][55][56][57][58][59], wavelength division multiplexing (WDM) [110][111][112][113][114], mode division multiplexing (MDM) [68,115,116], and the power splitter based on MMI coupling is easy to realize polarization-insensitive design. By analyzing the propagation of the photons, it is known that the position of the reproduced n-double image is: Where L π is the beat length, which is defined as:…”

“…Nowadays, several classical structures used for on-chip beam splitting mainly include y-branch waveguide [35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51], splitters based on multimode interference (MMI) coupling [52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69], splitters based on directional coupling (DC) [70][71][72][73][74][75], and splitters based on inverse design [76][77][78][79][80][81]. Among them, the design principle of y-branch waveguide is relatively simple, and the separation of mode and power is mainly realized through the y-type structure design.…”