Design and Simulation of 3D 1×4 Multimode Interference Splitter

Design, simulation, and optimization of the $1\times 4$ optical three-dimensional multimode interference splitter using IP-Dip polymer as a core and polydimethylsiloxane (PDMS) Sylgard 184 as a cladding is demonstrated. The splitter was simulated by using beam propagation method in BeamPROP simulation module of RSoft photonic tool and optimized for an operating wavelength of 1.55 $\mu\mathrm{m}$. According to the minimum insertion loss, the dimensions of the splitter were optimized for a waveguide with a core size of $4\times 4\ \mu \mathrm{m}^{2}$. The objective of the study is to create the design for fabrication by three-dimensional direct laser writing optical lithography.