Fig. 5: Experimental time delay of group-velocity-tailored STWPs measured at different distances. | Nature Communications

Fig. 5: Experimental time delay of group-velocity-tailored STWPs measured at different distances.

From: Space-time wave packets in multimode optical fibers with controlled dynamic motions and tunable group velocities

Fig. 5

a Frequency-β relationship of an STWP with ΔMG = –1 corresponding to a subluminal Vg. The correlation result shows a 1-ps time delay in 250 μm. b Frequency-β relationship of an STWP with ΔMG = +1 corresponding to a superluminal value Vg. The correlation result shows a 0.1-ps time delay in 250 μm. c Frequency-β relationship of an STWP with ΔMG = +2 corresponding to a negative value Vg. The correlation result shows a –0.7-ps time delay in 250 μm.

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