Based on the previous work, the research team led by Prof. Xinliang Zhang proposed an idea of realizing an all-optical programmable logic array ??by using canonical logic units (CLUs-PLA). The proposed program greatly simplified the structure of the programmable logic array. In specific, compared with the traditional PLA, the input circuit of the CLUs-PLA was realized by only a single passive delay interferometer, the canonical logic unit array replaced the AND array and the OR operation could be subsequently demonstrated by direct coupling. Additionally, the power consumption of the system was further reduced due to this simplified system configuration. The CLUs-PLA showed a strong reconfigurability that any combinational logic function could be implemented by CLUs-PLA. Based on this proposal, a further investigation of an expanded CLUs-PLA was developed with the four-wave mixing in highly nonlinear fiber. Experimental results showed that the computing capacity of the expanded CLUs-PLA was significantly improved than that of the standard CLUs-PLA. For three input signals, the computing capacity of the expanded CLUs-PLA capacity was 2.3 times as large as that of the standard CLUs-PLA, and the multiple kept going up as the idlers were more separately distributed. When the idlers were individually independent, the multiple reached to the maximum 3.6, indicating that the expanded CLUs-PLA had the potential to achieve much more logic functions. The full text of this work was published in Optics Express (Vol. 22, No. 8, pp. 9959-9970, 2014).
This work is supported by the National Science Fund for Distinguished Young Scholars (No. 61125501), the NSFC Major International Joint Research Project (No. 61320106016), the National Basic Research Program of China (No. 2011CB301704), and the National Natural Science Foundation of China (No. 60901006, 11174096).