| The cavity dispersion is an important factor to the generation of microresonator frequency comb. In order to find the dispersion for micro ring, we measure the dispersion by beating a tunable laser with a mode locked laser frequency comb. The measurement takes less than 10 seconds to complete and has good accuracy. We developed the codes to process the raw data and calculate the cavity dispersion from the free spectral range evolution. From the experimental result, we were able to get to 10% uncertainty for the measurement on some micro-ring. In addition, we found that our measured dispersion match with the simulated value for a number of devices. |
