Figure 4: Transmission spectra of a large-scale SC5 superlattice (made by HSQ resist) for five input waveguides in a representative supercell (Ti,j, i=11∼15, j=i−5, i−4, … i+4, i+5).
From: High-density waveguide superlattices with low crosstalk
a=0.78 μm, L=500 μm. The colour for each output channel is shown in the legend. (a) Spectra. To avoid cluttered view, only Ti,i±1(λ) plus the worst are shown for each i. (b) Scatter plot of Ti,i versus Ti,j for all 50 crosstalk spectra (j≠i), for three bands: λ≤1,530 nm (green), 1,530∼1,560 nm (blue) and 1,560∼1,570 nm (red). The lines of Ti,j−Ti,i=−20, −25 dB are delineated (to demark relative crosstalk levels).
