Carry-free Addition in Parallel Based on Ternary Optical Computer
基于三值光计算机的并行无进位加法

This study implemented carry-free addition of two vectors in parallel on the ternary optical computer. Its key part is made up of a piece of monochromatic LCD, whose volume is 38.0 X 65.5 X 2. 2mm3 and power is 0. 3mw, and a layer of polaroid on either side. The parallel and carry-free addition was realized in three steps by defining four transformations on Modified Signed-Digit(MSD) number system. And the required time of the addition is independent of the digits of operands. An experiment certified the feasibility and correctness of the parallel and carry-free addition on the ternary optical computer. The system can finish the addition of two numbers with 680 bits in MSD code in three steps and in fully parallel.