Abstract
The excess loss across an acute-angle symmetric X-junction composed of two weakly guiding single-mode buried channel waveguides of square core cross-section is shown to be very small provided the junction angle is greater than a few degrees. Numerical and approximate analytical results are presented, as well as a simple criterion for the onset of cross-talk as the junction angle decreases.
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Ladouceur, F., Love, J.D. X-junctions in buried channel waveguides. Opt Quant Electron 24, 1373–1379 (1992). https://doi.org/10.1007/BF00625813
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DOI: https://doi.org/10.1007/BF00625813