Abstract
By using a genetic algorithm, geometry parameters of largecross-sectional S-bend rib waveguides are optimized aiming at the leasttotal loss when the propagation loss is considered. Optimized resultsare presented as an example of S-bend rib waveguides based onsilicon-on-insulator (SOI) 4×4 optical switches. The value of 2 dB/cmis given to the propagation loss according to the experimental results.The simulation results indicate that the total loss drops from 1.0002 dBdown to 0.4375 dB without considering a lateral offset. If the offset isadopted, the total loss reduces from 0.5463 dB to 0.2365 dB. In addition,the effect of the rib height ratio on the loss is analysed, and theoptimal ratio is obtained to be 0.55.
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