Simple analytical expressions, describing the performance of the Y-junction as a function of only one parameter, the mode conversion factor (MCF), are derived. The expressions are based on numerical studies of Y-junctions with varying MCFs by means of the finite-difference beam propagation method (FDBPM). The simple expressions are compared with published switching curves of electro-optic Y-junction switches and found to be in excellent agreement.
Krijnen, G. J. M., Hoekstra, H., Lambeck, P., & Popma, T. J. A. (1992). Simple analytical description of performance of Y-junctions. Electronics letters, 0(22), 2072-2074. [10.1049/el:19921328]. https://doi.org/10.1049/el:19921328