Propagating — Lesson 2

Propagation Settings

Following the Finding Modes step, you can open the EME Analysis Window to move on to the Propagating step and do further analysis. In this video lesson, you will learn how to run a single propagation, propagation sweep, and mode convergence sweep in the EME Analysis Window.

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Propagation Example

In this video lesson, we will use a 1x2 MMI coupler example to demonstrate the Propagation setup. We will also demonstrate how to visualize the transmission results once the field is propagated. To follow along with the video, you can first download the simulation file used here.

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Interpreting an S-Matrix

An S-matrix relates the transmission and reflection coefficients of each port. In this video lesson, you will learn how to use the S-matrix mapping table to identify the corresponding modes and ports in the S-matrix, and how to interpret the user S-matrix and internal S-matrix.

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Periodicity Example

Lumerical EME allows you to change the periodicity of the groups and run the Propagation without running the simulation again to find modes since it can use the S-matrix that has been already saved. In this simulation, we will use the Fiber Bragg grating example to demonstrate the use of the Periodicity options in the EME Analysis window. You can download the simulation file here to follow along with the demonstration.

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Propagation Sweep

The propagation sweep tool automates the propagation for a range of cell group spans and collects the user s matrix for each point in the sweep. In this video lesson, you will learn how to use the propagation sweep tool to optimize the span of a specific group span in your device.

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Propagation Sweep Example

In this video lesson, we are using the same 1x2 MMI waveguide to demonstrate the Propagation sweep. You will learn how to sweep the span of the central diffraction region of the device to determine the minimum length required for a 50/50 transmission from the two output waveguides. The simulation file can be downloaded here.

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