To transmit an optical wave to any location in an OIC, the waveguide crossings must be integrated. In this part, two integrated structures that consist of 2 × 2 (Fig. 8) and 3 × 3 (Fig. 9) waveguide crossings
Additionally, the effort that would have been required to transform the provided mesh into a structured numerical grid internally may be completely avoided. In the same way as with FDM, the approximation that is reached results in a discrete solution; however, the variables are often positioned ...