Fig. 1.

The cross-talk-generated noise is induced by high spatial coherence. (a) The optical fields from parallel detection channels (drawn schematically as tubes) are within the same coherence area $A_c$. So, as shown in the second column, fields add coherently (red and blue waves produce a wave with larger amplitude), and intensities recorded by detector pixels (squares in the last column) contain cross-talk-generated noise, which is represented here as random spheres. (b) Contrary, for low spatially coherent light, fields from parallel detection channels are independent (each channel is within different coherence area,$A_{c,1}$ and $A_{c,2}$). Thus, optical fields do not interfere, and the cross-talk-generated noise is absent.