Fig. 3 | Nature Communications

Fig. 3

From: Dissipatively coupled waveguide networks for coherent diffusive photonics

Fig. 3

Coherent diffusive equalisation in a dissipatively coupled waveguide pair. a Sketch illustrating the photonic implementation of two sites coupled via a reservoir (same as Fig. 1c). Here, WG1 and WG2 are two waveguides comprising the chain and the array of coupled waveguides, indicated by pink circles, acts as the reservoir. b The equalisation effect: WG1 is excited initially with a coherent input and the light intensities (I 1,2) at WG 1, 2 are measured after a propagation of z = 30 mm. The coherent diffusive evolution distributes the input light equally between WG1 and WG2. In this implementation, the effective propagation time γt of Eq. (1) and Fig. 2 translates into propagation distance z along the grey waveguides in Fig. 1 c. For a fixed sample length z, the dynamics can then be best assessed by monitoring the output intensity as a function of the wavelength as shown in the graph (see text and Supplementary Notes 1 and 2 for details). This effectively corresponds to changing γtκ 1 z. cf, Output intensity distributions for four different wavelengths (700, 730, 770 and 790 nm, respectively), indicated by the vertical dashed lines in b

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