During the last decades it was demonstrated that an effective discretization of light in waveguide arrays can influence the field propagation considerably, e.g., the sign of diffraction can be inverted and discrete solitons can be formed [1]. Here we transfer this concept to the temporal domain by applying a time-periodic phase variation to optical pulses propagating in a fibre transmission line. Each time the pulses are reamplified in a recirculating fibre-loop setup, they also pass a phase modulator (see Fig. 1). A 10 GHz phase modulation un+ = un− exp[iϕ0 cos(ω0τ)×(1+Δϕ sin(2πz=Lmod))] with a strength ϕ0 is applied there. The depth of the modulation can be varied during propagation along the fibre (z-direction) with an amplitude Δϕ and period Lmod. During each round trip the time-dependent field distribution was measured with an all-optical sampling oscilloscope.
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机译：在过去的几十年中，事实证明，波导阵列中光的有效离散会显着影响场传播，例如，衍射的符号可以反转并且可以形成离散的孤子[1]。在这里，我们通过将时间周期相位变化应用于在光纤传输线中传播的光脉冲，将这一概念转移到时域。每次在循环光纤环路设置中放大脉冲时，它们也会通过相位调制器（见图1）。 10 GHz相位调制u n + = u n − exp [iϕ 0 cos（ω 0 τ）× （1 + Δϕ sin（2πz= L mod ））]施加强度为ϕ 0 。调制深度可以在沿着光纤的传播过程中（z方向）以幅度Δϕ和周期L mod 改变。在每次往返过程中，使用全光学采样示波器测量随时间变化的场分布。
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