Figure 2
Maximum cross coupled power deviation Δκ versus straight (L s ) and curved (L c ) lengths of curved directional coupler for (a) R c = 26 μm, g = 200 nm, w 1 = w 2 = 400 nm, (b) R c = 13 μm, g = 200 nm, w 1 = 380 nm, w 2 = 420 nm. The black contour overlay indicates the cross port power κ at 1570 nm. The white circles indicate chosen dimensions for a wavelength insensitive 50/50 coupler.
