Presented in this paper is one of several possible electrooptical engagement array architectures for performing matrix–matrix multiplication using incoherent light. Essential components of this new signal-processing device include two dynamic light valves operating in a reflection mode, a 2-D photodetector array, and a single polarizing beam splitter.
R. P. Bocker, H. J. Caulfield, and K. Bromley, "Rapid unbiased bipolar incoherent calculator cube," Appl. Opt. 22, 804-807 (1983)