Fig. 3: Experimental result for dot product operation with our device.
From: 120 GOPS Photonic tensor core in thin-film lithium niobate for inference and in situ training
a A schematic of the working principle of our device. The light is emitted from a laser and then passes through two cascaded thin-film lithium niobate (TFLN) Mach-Zehnder modulators (MZMs). The TFLN MZMs are driven by a high-speed arbitrary waveform generator (AWG). The light is then received by two photodetectors (PDs, marked as PD1 and PD2) in a balanced detection scheme, and the corresponding photogenerated electrons are accumulated in the integrator. Reading the output voltage of the integrator with ADC, we can obtain the dot product result. ADC: analog-to-digital converter. IC: integrated circuit. DAC: digital-to-analog converter. b The results of dot product operation between two 131072-dimensional vectors performed by our device with a computational speed of 120 GOPS. Compared with the expected dot product results, the error of the measured ones has a standard deviation of 0.03 (6.04 bits).
