Zhou S, Campbell S, Yeh P, Liu H K
Appl Opt. 1995 Feb 10;34(5):793-802. doi: 10.1364/AO.34.000793.
We propose and demonstrate an effective two-stage modified signed-digit optical computing technique (in contrast to previous three-stage techniques) based on spatial data encoding, polarization multiplexing, and multiple imaging. Our proposed reduction in operation stages requires a reference operation in addition to the transformation and weight operations common to three-stage systems. In our system's first stage a transformation (or weight) operation and a reference operation are implemented in parallel by use of four distinct polarization-multiplexed kernel operations. In the second stage the final desired result (e.g., addition and subtraction) and its complement are obtained in parallel with a single kernel operation. The operation speed of our two-stage modified signed-digit computing method is 33% faster than previous three-stage modified signed-digit algorithms.
我们提出并演示了一种基于空间数据编码、偏振复用和多重成像的有效的两阶段改进符号数光学计算技术（与之前的三阶段技术形成对比）。我们所提出的操作阶段的减少，除了三阶段系统共有的变换和加权操作之外，还需要一个参考操作。在我们系统的第一阶段，通过使用四种不同的偏振复用内核操作，并行实现一个变换（或加权）操作和一个参考操作。在第二阶段，通过单个内核操作并行获得最终期望结果（例如加法和减法）及其补码。我们的两阶段改进符号数计算方法的运算速度比之前的三阶段改进符号数算法快33%。
