A revolution in Photonic Integrated Circuit Modeling EME. Cutting-edge software that uses the EME method (Eigenmode Expension) to simulate propagation calculations of large-scale photonic integrated circuits.

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Multi-Topology (MT) FIMMPROP is a new innovative designenvironment from Photon Design. Combining the roles of layout and simulation,MT-FIMMPROP does away with the frustrating need to shuttle between two designenvironments when designing PICs.


  • MZI (Mach-Zehnder Interferometer)
  • Large ring resonator
  • Optical performance evaluation of the entire PIC
  • Component design
  • Layout design
  • Device simulation


Photonics component modeling, circuit simulation, & layout/mask generation in one software!


  • Flexible layout editor
  • Equipped with a scanner interface that allows you to easily scan design parameters
  • Complete PIC simulation with actual design layout
  • GDSⅡ data export

Modeling a long arm Mach-Zehnder Interferometer


Long-arm Mach-Zehnder Interferometers (MZIs) are an example of the type of structures that can now be modeled efficiently and accurately using MT-FIMMPROP.

MT-FIMMPROP is used to model an interleaver design proposed by Cherchi et al. that is based on cascaded MZIs and multimode interferometers (MMIs) as power splitters.

Using the built-in scanner, we can obtain the response of the device shown to the right. The results show that the design has a flat-top response, improving on the sinusoidal response of a simple MZI design.


Modeling a large ring resonator

Large ring resonators are a good example where it is significantlymore efficient to use a simulation technique that defines computational regionsthat conform to the waveguides in the device.

The double ring resonator example shown in this picture(radius: 30um) is modeled using only the red hashed computational regions. Therefore,we avoid having to unnecessarily include the large areas in the center of therings in the computation.


An added advantage is that using computational regions that conform to the waveguides means that the number of modes required in each computational region is minimised. 

Furthermore, this simulation also takes advantage of MT-FIMMPROP’s ability to re-use s-matrices of repeated components to improve efficiency. The bus-ring coupling region only has to be calculated once.


Scanning over the wavelength using the built-in scanner interface, we can look at the transmission from the port at the top left of the device to the port at the bottom left and the coupling from the port at the top left to the port at the bottom right.

This picture shows the plot of the Hy field through the whole device at 1.55262um wavelength when injecting mode 1 into the port at the top left.

Download the MT-FIMMPROP PDF

For more information on Photon Design's suite of photonic CAD tools, visit our pages on FIMMWAVE , and FIMMPROP .