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Nonlinear suppression of time reversals in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="script">PT</mml:mi></mml:mrow></mml:math>-symmetric optical couplers
We reveal a generic connection between the effect of time reversals and nonlinear wave dynamics in systems with parity-time ($\mathcal{PT}$) symmetry, considering a symmetric optical coupler with balanced gain and loss where these effects can be directly observed experimentally. We show that for intensities below a threshold level, the amplitudes …