Fig. 1: Illustration of experiment. | Nature Communications

Fig. 1: Illustration of experiment.

From: High-fidelity spatial mode transmission through a 1-km-long multimode fiber via vectorial time reversal

Fig. 1

a The concept of time reversal. b Schematic of the experiment to send high-fidelity spatial modes from Alice to Bob. Bob first transmits a probe beam to Alice (denoted by red beams). Alice performs vectorial off-axis holography on her received probe beam and generates the corresponding time-reversed signal beam (denoted by blue beams). \(\left|\,\text{H}\,\right\rangle\) and \(\left|\,\text{V}\,\right\rangle\) stand for the horizontal and vertical polarization state, respectively. HWP: half-wave plate. PBD: polarizing beam displacer. SMF: single-mode fiber. BS: beamsplitter. See Supplementary Note 2 for experimental details.

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