Fig. 4
From: Ultrafast perturbation maps as a quantitative tool for testing of multi-port photonic devices
Experimental investigation of a 3 × 3 MMI and comparison with predictions. a–d Same as in Fig. 3 for a MMI with designed length L = 88.0 μm and width W = 6.0 μm, and SEM measured length L = 89.2 μm and width W = 5.95 μm. The scale has been halved in the propagation axis for b, c. The amplitude of the color bar in c is ±0.3 for the experimental maps and ±0.4 for the theoretical ones
