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Despite over 40 years' development of optical logic computing, the studieshave been still struggling to support more than four operands, since the highparallelism of light has not been fully leveraged blocked by the opticalnonlinearity and redundant input modulation in existing methods. Here, wepropose a scalable multi-input optical programmable logic array (PLA) withminimal logical input, enabled by parallel spectrum modulation. By making fulluse of the wavelength resource, an eight-input PLA is experimentallydemonstrated, and there are 2^256 possible combinations of generated logicgates. Various complex logic fuctions, such as 8-256 decoder, 4-bit comparator,adder and multiplier are experimentally demonstrated via leveraging the PLA.The scale of PLA can be further extended by fully using the dimensions ofwavelength and space. As an example, a nine-input PLA is implemented to realizethe two-dimensional optical cellular automaton for the first time and performConway's Game of Life to simulate the evolutionary process of cells. Our worksignificantly alleviates the challenge of extensibility of optical logicdevices, opening up new avenues for future large-scale, high-speed andenergy-efficient optical digital computing.

Eight-input optical programmable logic array enabled by parallel spectrum modulation