Power Splitter With Tunable Power Splitting Ratio In Large Bandwidth Based On Hybrid Surface Plasma Waveguide

The optoelectronic system has the advantages of large bandwidth and high speed,which improves the device performance and integration level,and the power splitter is an important passive device unit in the integrated optical subsystem.The purpose of this paper is to design high-performance power dividers,which include large bandwidth power splitter and power splitters with tunable beam splitting ratio.From the basic theory of optoelectronics,using hybrid surface plasma waveguide structure,using Lumerical FDTD simulation software,using finite-difference time-domain method,optimizing the structural parameters of the power splitter to design a high-performance optical power splitter structure.The main contents of this paper are as follows.(1)This paper summarizes the research progress of power splitter,the design schemes of uniform power divider and power splitter with tunable beam splitting ratio and their advantages and disadvantages.This paper introduces the silicon-based optical waveguide and its classification,deduces the basic principle of mode coupling between waveguides,and describes the numerical calculation method when solving the waveguide mode.(2)The design model and optimization method of a large bandwidth power splitter based on hybrid surface plasmon waveguide are proposed.The structural parameters of the power splitter are designed to achieve large bandwidth performance,and the wavelength dependence is eliminated and the bandwidth is increased by adjusting the length and position of the asymmetric segment of the metal layer to change the field amplitude and phase.Simulations show that the power splitter achieves the performance of uniform beam splitting within a large bandwidth of200 nm,which has the advantages of large bandwidth,thermal stability,small size.(3)Two design solutions for power splitters with tunable splitting ratio are proposed,one of which is a large bandwidth tunable power splitter based on hybrid surface plasmon waveguides,and the tunable function is achieved by changing the waveguide structure.Simulations show that the power splitter achieves tunable function within a large bandwidth of 100 nm,which has the advantages of low loss,thermal stability and small size.The other is a tunable power splitter based on graphene micro-heater,which achieves higher heating efficiency by introducing graphene micro-heater to achieve the tunable function,and simulations show that the power splitter achieves tunable function at 1550 nm.It has the advantage of adjusting the splitting ratio without changing the system structure.It provides a new idea for the design of high-performance power splitters and other optoelectronic devices.