Modelling a large Ring Resonator
PICWave can easily and efficiently model ring resonators of 100's um diameter. The algorithm is many orders of magnitude more efficient than eg FDTD for this application, computing a triple 200um diameter ring resonator down to a wavelength resolution of 50MHz and spectral range of 50nm in just a couple of minutes.
The result shown in the picture below shows a case of a
60um diameter ring resonator; PICWave yielded a result in a few seconds,
while OmniSim needed 14 hours.
The difference is even bigger for larger ring resonators. The reason is that PICWave can use a large time step, and so can handle simulation durations in the range of several ns, yielding spectral resolutions finer than 1GHz. In fact, MHz resolutions are attainable. This kind of resolutions is important in the case of large ring resonators.
Even the accuracy obtained is better. As you can see from the graph, PICWave agreement with the theoretical solution is remarkable, and calculated in a few seconds.
Samples: An active 2R optical regenerator
Ring Resonator Filter