In order to transform 2D tri-state light signals to electronic signals, a new method applied to implement ternary optical decoder is presented, and the decoder consists of a semi-transparent mirror, orthogonal polarizers, micro-lens arrays, photodiode detector arrays, 2D SRAM arrays and an embedded system. A simulation device of the decoder was designed and fabricated based on a commercial CMOS image sensor and a 32-bit embedded CPU. Experimental results, decoding to the output of ternary logic optical operation unit, show that the accuracy is 100%; the data width is 128 bits and can easily be extended to kilobits and myriabits. Compared with other similar researches, it has the advantages of high data width, programmability, controllability and well scalability.