Figure 3 | Scientific Reports

Figure 3

From: Space division multiplexing in standard multi-mode optical fibers based on speckle pattern classification

Figure 3

Cross-correlation coefficient ρ between reference speckle patterns (generated by individual inputs) and speckle patterns generated by arbitrary combinations of inputs. These results are grouped according to their expected outcome: \({\rho }_{0}=1/\sqrt{n}\) when n inputs are active and the resulting speckle patterns is compared with a reference pattern generated by one of those n inputs (green markers), and ρ0 = 0 when compared with any other reference pattern (red markers). The density of the blue bands represents the expected statistical spread of these results, based on the number of available speckle spots for calculating the pattern cross-correlations (see Supplementary Material). Details of the highlighted markers are given in Table 1. The dashed horizontal line represents the decision threshold used to recover the input states: si = 1 for cross-correlations above threshold, si = 0 below threshold.

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