Fig. 3: Experimental results of tensor convolution.
From: High-order tensor flow processing using integrated photonic circuits
a Conceptual experimental setup of the PTFP chip. MUX, wavelength multiplexer; AWG, arbitrary waveform generator. The generated signals are amplified and modulated on the optical carrier. After the tensor convolution, digital data is recorded at the output of the EPC. b Output synchronization. In synchronization, only one waveform is used to input one signal. The waveforms of different output ports are identical with different delays. We highlight an identical segment of these waveforms with thicker linewidth. c Output samples of the 1 × 3 convolutions. The original input is given for reference and a zoom-in plot is given for details. d Result of multi-channel convolution. The input images are listed as left insets. The result is depicted on the right. Typical objects are labeled. e The original image for demonstrating multi-channel convolution. A patch is zoomed-in for better observation. f–i Convolutional results with different applied kernels of horizontal Sobel, vertical Sobel, blurring, and sharpening, respectively. The weights of the kernels are provided by the bar charts. h and i are zoomed-in for better observation.
