Figure 5
From: Is there an optimal basis to maximise optical information transfer?
Eigenvalue spectrum for different optical restricting elements, (a) the free space, (b) a 5 μm pinhole, (c) a 3 μ pinhole and (d) a “few-mode” fibre. Grayed-out areas show the noise levels (see Supplementary Section 5 for more discussions, code and data available online [34]).
