. The setup consists of two optical fibre loops, which are coupled by a variable beam splitter that controls the coupling parameter. The loops are of unequal length, such that the roundtrip times are approximately given by 27 μs ± 50 ns. The time difference of 100 ns defines the temporal width of a time-bin, in which the lattice positionsare encoded, such that approximately 270 positions can be encoded in the loops.
In the broken PT phase, it is expected that the overall light intensity can exponentially grow with propagation time. Such growth in optical power can lead to a quick and nonlinear gain saturation of the amplifiers. Furthermore, high optical power might induce nonlinear effects via self-phase modulation or damage the optical components.
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