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Waveguide and DirectionalCouplerMODE SimulationHigh-Speed Circuits & Systems Lab.Dept. of Electrical and Electronic EngineeringYonsei UniversityOptoelectronics (16/2)Yonsei University
Lumerical Solutions3D Maxwell solver(FDTD)Modal analysis(MODE)Charge transport & heat transfer(DEVICE)Optoelectronics (17/2)(16/2)Yonsei University
Lumerical MODE Solution FDE(Finite Difference Eigenmode) solver-Calculate physical properties of waveguide modes-Solve Maxwell’s equations for cross-sectional mesh 2.5D varFDTD(Finite Difference Time Domain)-Time domain simulation with approximation-2D simulation speed with 3D accuracy Most simulationswill be held withthese solversEME(Eigenmode Expansion) solver-Frequency domain simulationOptoelectronics (17/2)(16/2)Yonsei University
License SettingOptoelectronics (17/2)(16/2)Yonsei University
MODE WindowSimulation SettingSimulationStructure Setting3D Structure ViewerScript File EditorCommand WindowOptoelectronics (17/2)(16/2)Yonsei University
Waveguide Structure Drawing structure––––––Example) Make strip waveguideHeight: 220 nmWidth: 500 nmLength: 30 μmCore material: SiCladding material: SiO2220nm500nmOptoelectronics (17/2)(16/2)Yonsei University
Structure Build(GUI)Optoelectronics (17/2)(16/2)Yonsei University
Structure Build(GUI) CladdingYou can use both (x & span)or (x min & max) for setupOptoelectronics (17/2)(16/2)Mesh order: If materifolded, choose materwhich has smaller meorderYonsei University
Structure Build(GUI) CladdingOptoelectronics (17/2)(16/2)Yonsei University
Structure Build(GUI) CoreOptoelectronics (17/2)(16/2)Yonsei University
Simulation Setup(GUI) Eigenmode SolverOptoelectronics (17/2)(16/2)Yonsei University
Simulation Setup(GUI)Optoelectronics (17/2)(16/2)Yonsei University
Simulation Setup(GUI)Optoelectronics (17/2)(16/2)Yonsei University
Simulation Setup(GUI)Optoelectronics (17/2)(16/2)Yonsei University
Simulation Setup(GUI)SimulationOptoelectronics (17/2)(16/2)Yonsei University
MODE SolutionsCalculatedmodesOptoelectronics (17/2)(16/2)Infers whether the mode is true or notfrom effective indexYonsei University
Confinement FactorBoundarysettingOptoelectronics (17/2)(16/2)Yonsei University
Group Index(ng)①②③④Change to group indexOptoelectronics (17/2)(16/2)Yonsei University
Sweep WidthSweep waveguide width from 100nm to 300nm with 50nm stepTo verify single mode conditionOptoelectronics (17/2)(16/2)Yonsei University
Sweep ResultsSingle modeconditionSiO2 refractive index: 1.44Optoelectronics (17/2)(16/2)Yonsei University
Design Exercise 2-1What is the single-mode condition for the given thickness of ribwaveguide? Also, calculate group index(ng) for the single-moderib waveguide.-220nm thick & 100nm slab at 1550nmDue: 27 Nov. in classWidth100nmOptoelectronics (17/2)(16/2)Yonsei University
Tips for Design Exercise 2-1 Condition for guidance of rib waveguide:neff total neff1:Making same environment as strip waveguideneff1neff1 How to get neff1:Use 1-D Z:X prop simulation in FDE solverCalculateeffective index hereOptoelectronics (17/2)(16/2)Optoelectronics (17/2)Yonsei University
Waveguide coupler Y-branch coupler Ideally 50:50 power splitterBezier CurveCurve shape change due to x2, y2Optoelectronics (17/2)(16/2)Yonsei University
Y-branch coupler Waveguide structure groupPut waveguide structure value in here Download y splitter.lms file at YSCECOptoelectronics (17/2)(16/2)Change the shape of curveYonsei University
Structure (cladding) RectangularOptoelectronics (17/2)(16/2)Yonsei University
Simulation Setup 2.5D FDTD Solver Setting(Variational FDTD Solver)Optoelectronics (17/2)(16/2)Yonsei University
Simulation Setup Source Setting(MODE source)Optoelectronics (17/2)(16/2)Yonsei University
Simulation Setup Monitor 1 Setting (Frequency domain field and power)-Frequency point should be large enoughOptoelectronics (17/2)(16/2)Yonsei University
Simulation Setup Monitor 2 Setting (Frequency domain field and power)-Frequency point should be large enoughOptoelectronics (17/2)(16/2)Yonsei University
Run Simulation After setup, run simulationOptoelectronics (17/2)(16/2)Yonsei University
Result Monitor 1 (Right click) Visualize T Monitor 2 (Right click) add to visualizer 1 T50:50 power splittingfor each wavelengthOptoelectronics (17/2)(16/2)Yonsei University
Design Exercise 2-2Design rib waveguide type Directional Coupler. Use waveguide widthfrom the result of Design Exercise 2-1.-220nm thick & 100nm slab at 1550nmDue: 27 Nov. in classOptoelectronics (17/2)(16/2)Yonsei University
Lumerical MODE Solution . 2.5D FDTD Solver Setting(Variational FDTD Solver) Optoelectronics (16/2)Optoelectronics (17/2) Yonsei University Simulation Setup Source Setting (MODE source) Optoelectronics (16/2)Optoelectronics (17/2) Yonsei University Simulation Setup Monitor 1 Setting (Frequency domain field and power)-Frequency point should be large enough. Optoelectronics (16/2 .
