all-optical half-subtracter

Some kinds of all-optical half-subtracter are introduced and their structures and principles are analyzed,and their advantages and disadvantages are also discussed. Finally,the prospects of all-optical half-subtracter are given.
介绍了几种全光半减器的实现方案,分析了各方案的结构和工作原理,以及各自的优缺点,并展望了半减器的发展方向。